NORTH AMERICAN VACCINE INC
10-Q/A, 2000-03-09
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

                                    FORM 10-Q/A
(Mark One)

[X]   QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
      SECURITIES EXCHANGE ACT OF 1934

                FOR THE QUARTERLY PERIOD ENDED SEPTEMBER 30, 1999

                                       OR

[  ]  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
      SECURITIES EXCHANGE ACT OF 1934

           For the transition period from ____________ to ____________

                        COMMISSION FILE NUMBER 1-10451

                          NORTH AMERICAN VACCINE, INC.
                          ----------------------------
            (Exact name of registrant as specified in its charter)

          CANADA                                       98-0121241
          ------                                       ----------
       (State or other jurisdiction of                 (IRS Employer
       incorporation or organization)                  Identification No.)

10150 OLD COLUMBIA ROAD, COLUMBIA, MARYLAND                   21046
- -------------------------------------------                   -----
(Address of principal executive offices)                    (Zip Code)

Registrant's telephone number, including area code:  (410) 309-7100

FORMER ADDRESS:
- --------------------------------------------------------------------------------
(Former name, former address and former fiscal year, if changed since last
report)

Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the  preceding 12 months (or for such  shorter  period that the  registrant  was
required  to file  such  reports),  and  (2) has  been  subject  to such  filing
requirements for the past 90 days.
Yes   X   No
     ---

Indicate the number of shares outstanding of each of the registrant's classes of
Common Stock, as of the latest practicable date.

COMMON  STOCK,  NO  PAR  VALUE,  OUTSTANDING AS OF NOVEMBER 3, 1999 - 32,870,350
SHARES

<PAGE>

                                TABLE OF CONTENTS



                                                            PAGE NUMBER
PART I.  FINANCIAL INFORMATION                              -----------

Item 1.  Financial Statements.................................   3

         Consolidated Balance Sheets..........................   4

         Consolidated Statements of Operations................   5

         Consolidated Statements of Shareholders' Deficit.....   6

         Consolidated Statements of Cash Flows................   7

         Notes to Condensed Consolidated Financial Statements.   9

Item 2.  Management's Discussion and Analysis of
         Financial Condition and Results of Operations........  14

Item 3.  Quantitative and Qualitative Disclosures About
         Market Risk..........................................  27

PART II. OTHER INFORMATION

Item 1.  Legal Proceedings....................................  30

Item 2.  Changes in Securities and Use of Proceeds............  30

Item 6.  Exhibits and Reports on Form 8-K.....................  31


SIGNATURES ...................................................  32



                                       2
<PAGE>


                         PART I. FINANCIAL INFORMATION


ITEM 1.   FINANCIAL STATEMENTS
          --------------------

The following unaudited,  condensed  consolidated  financial statements of North
American  Vaccine,  Inc. and Subsidiaries  (the "Company") have been prepared in
accordance with the instructions to Form 10-Q and,  therefore,  omit or condense
certain  footnotes  and  other   information   normally  included  in  financial
statements prepared in accordance with generally accepted accounting principles.
This report should be read in  conjunction  with the Company's  Annual Report on
Form 10-K  filed  for the year  ended  December  31,  1998.  In the  opinion  of
management,  all adjustments  (consisting only of normal recurring  adjustments)
necessary for a fair  presentation of the financial  information for the interim
periods  reported have been made.  Results of operations  for the three and nine
months ended  September  30, 1999,  will not  necessarily  be  indicative of the
results for the entire fiscal year ending December 31, 1999.












                                       3
<PAGE>

<TABLE>
<CAPTION>

NORTH AMERICAN VACCINE, INC. AND SUBSIDIARIES
CONSOLIDATED BALANCE SHEETS
(IN THOUSANDS, EXCEPT SHARE AND PER SHARE DATA)                          SEPTEMBER 30,           DECEMBER 31,
                                                                             1999                    1998
                                                                        ---------------         --------------
ASSETS                                                                    (UNAUDITED)
- ------
<S>                                                                    <C>                     <C>
CURRENT ASSETS:
  Cash and cash equivalents                                             $        1,917           $      22,953
  Accounts receivable                                                            1,729                   1,625
  Inventory                                                                      4,457                   4,067
  Prepaid expenses and other current assets                                        810                     998
                                                                       ----------------         --------------
          Total current assets                                                   8,913                  29,643
Property, plant and equipment, net                                              21,076                  25,315
Investment in affiliate, at market                                                   -                   1,554
Deferred financing costs, net                                                    2,566                   2,505
Cash restricted for lease obligation                                             3,624                   4,877
Other assets                                                                       858                     631
                                                                       ----------------         --------------
     TOTAL ASSETS                                                       $       37,037           $      64,525
                                                                       ================         ==============

LIABILITIES AND SHAREHOLDERS' DEFICIT
CURRENT LIABILITIES:
  Accounts payable                                                      $        4,448           $       3,881
  Short term debt                                                                4,000                       -
  Deferred revenue                                                                   -                     850
  Obligation under capital leases, current portion                               1,927                   1,754
  Other current liabilities                                                      8,360                   5,848
                                                                       ----------------         --------------
         Total current liabilities                                              18,735                  12,333

6.5% Convertible subordinated notes, due May 1, 2003                            75,326                  83,734
4.5% Convertible secured notes, due November 13, 2003                           25,000                  25,000
Obligation under capital leases, net of current portion                          1,016                   2,356
Deferred rent credits, net of current portion                                      186                      76
                                                                       ----------------         --------------
     Total liabilities                                                         120,263                 123,499

COMMITMENTS AND CONTINGENCIES

SHAREHOLDERS' DEFICIT:
  Preferred stock, no par value; unlimited shares
    authorized-Series A, convertible; issued
    and  outstanding  2,000,000  shares;
    entitled to Can $2.50 per share (or U.S. $3.4
    million in the aggregate) in liquidation                                     6,538                   6,538
  Common stock, no par value; unlimited shares authorized;
    issued 32,859,581 shares at September 30, 1999
    and 32,216,096 shares at December 31, 1998                                  90,473                  80,824
  Additional paid-in capital                                                    13,047                  11,956
  Cumulative comprehensive income excluded from net loss                             -                     926
  Accumulated deficit                                                          193,284)               (159,218)
                                                                       ----------------         ---------------
         Total shareholders' deficit                                           (83,226)                (58,974)
                                                                       ----------------         ---------------
     TOTAL LIABILITIES AND SHAREHOLDERS' DEFICIT                        $       37,037           $      64,525
                                                                       ================         ===============

The accompanying notes are an integral part of these condensed consolidated financial statements.
</TABLE>


                                          - 4 -
<PAGE>


<TABLE>
NORTH AMERICAN VACCINE, INC. AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF OPERATIONS
(IN THOUSANDS, EXCEPT PER SHARE DATA)
(UNAUDITED)

<CAPTION>
                                                                 THREE MONTHS ENDED                    NINE MONTHS ENDED
                                                                    SEPTEMBER 30,                        SEPTEMBER 30,
                                                                 1999            1998                 1999           1998
                                                            --------------  --------------       --------------  -------------

<S>                                                         <C>              <C>                 <C>             <C>
 REVENUES:
      Product sales                                          $      1,173    $        501       $        3,589    $       845
      Marketing, research and development agreements                3,249           2,563                4,037          4,282
                                                            --------------  --------------       --------------  -------------
           Total revenues                                           4,422           3,064                7,626          5,127
                                                            --------------  --------------       --------------  -------------

 OPERATING EXPENSES:
     Production                                                     5,449           5,108               15,821         14,274
     Research and development                                       4,202           4,731               11,827         13,264
     Selling, general and administrative                            3,465           2,383                8,585          7,198
                                                            --------------  --------------       --------------  -------------
           Total operating expenses                                13,116          12,222               36,233         34,736
                                                            --------------  --------------       --------------  -------------

 OPERATING LOSS                                                    (8,694)         (9,158)             (28,607)       (29,609)

 OTHER INCOME (EXPENSE):
     Gain on sale of investment in affiliate                            -               -                  952              -
     Interest and dividend income                                      66             276                  446          1,232
     Interest expense                                              (2,193)         (1,571)              (6,857)        (4,793)
                                                            --------------  --------------       --------------  -------------
 NET LOSS                                                    $    (10,821)   $    (10,453)        $    (34,066)   $   (33,170)
                                                            ==============  ==============       ==============  =============

 BASIC AND DILUTED NET LOSS PER SHARE                        $      (0.33)   $      (0.32)        $      (1.05)   $     (1.03)

 WEIGHTED-AVERAGE NUMBER OF COMMON SHARES
      OUTSTANDING                                                  32,844          32,206               32,499         32,132

The accompanying notes are an integral part of these condensed consolidated financial statements.
</TABLE>


                                          - 5 -
<PAGE>


<TABLE>
NORTH AMERICAN VACCINE, INC. AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF SHAREHOLDERS' DEFICIT
(IN THOUSANDS)
(UNAUDITED)
<CAPTION>

                              SERIES A                                            CUMULATIVE
                             CONVERTIBLE                                         COMPREHENSIVE                  TOTAL
                           PREFERRED STOCK        COMMON STOCK       ADDITIONAL     INCOME        ACCUM-       SHARE-
                         -------------------- ----------------------  PAID-IN    EXCLUDED FROM    ULATED      HOLDERS'
                          SHARES     AMOUNT     SHARES      AMOUNT    CAPITAL       NET LOSS      DEFICIT      DEFICIT
                         -------- ----------- ---------- ----------- ----------- ------------- ------------ ------------

<S>                      <C>       <C>         <C>        <C>         <C>         <C>          <C>           <C>
Balance,
  December 31, 1998        2,000     $ 6,538     32,216    $ 80,824    $ 11,956    $      926   $ (159,218)   $ (58,974)
Net loss                       -           -          -           -           -             -      (34,066)     (34,066)
Increase in market
  value of investment          -           -          -           -           -            26            -           26
Realized investment
  holding gain                 -           -          -           -           -          (952)           -         (952)
                                                                                                              ----------
Comprehensive loss                                                                                              (34,992)
Exercises of stock
  options                      -           -         58         169           -             -            -          169
Shares issued under
  401(k) plan                  -           -         36         252           -             -            -          252
Warrant expense                -           -          -           -       1,091             -            -        1,091
Conversion of 6.5%
  subordinated
  convertible notes
  into common stock            -           -        550       9,228           -             -            -        9,228
Balance,
                         --------   ---------   --------  ----------  ----------  ------------ ------------  -----------
  September 30, 1999       2,000     $ 6,538     32,860    $ 90,473    $ 13,047    $        -   $ (193,284)   $ (83,226)
                         ========   =========   ========  ==========  ==========  ============ ============  ===========


The accompanying notes are an integral part of these condensed consolidated financial statements.
</TABLE>


                                          - 6 -
<PAGE>


<TABLE>
NORTH AMERICAN VACCINE, INC. AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF CASH FLOWS
(IN THOUSANDS)
(UNAUDITED)
<CAPTION>
                                                                             NINE MONTHS ENDED
                                                                               SEPTEMBER 30,
                                                                           1999           1998
                                                                      -------------   ------------
<S>                                                                   <C>             <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
    Net loss                                                           $   (34,066)    $  (33,170)
    Adjustments to reconcile net loss to net cash used in
      operating activities:
        Gain on sale of investment in affiliate                               (952)             -
        Loss on disposal of property, plant, and equipment                     384              -
        Depreciation and amortization                                        4,691          6,117
        Amortization and reduction of deferred financing costs                 840            366
        Contribution of common stock to 401(k) plan                            252            216
        Debt conversion expense                                                940              -
        Increase in other assets                                              (227)          (183)
        Increase (decrease) in deferred rent                                    92            (29)
        Cash flows provided by (used in) other working capital items         2,010         (2,427)
                                                                      -------------   ------------
              Net cash used in operating activities                        (26,036)       (29,110)
                                                                      -------------   ------------

CASH FLOWS FROM INVESTING ACTIVITIES:
    Capital expenditures                                                    (2,686)        (1,320)
    Proceeds from sale of investment in affiliate                            1,581              -
    Proceeds from sale/leaseback                                             2,110              -
                                                                      -------------   ------------
               Net cash provided by (used in) investing activities           1,005         (1,320)
                                                                      -------------   ------------

CASH FLOWS FROM FINANCING ACTIVITIES:
    Borrowings under revolving credit facilities                             4,000              -
    Proceeds from exercises of stock options, net                              169          2,017
    Loan to a former officer related to the purchase of common stock             -         (1,228)
    Principal payments on capital lease obligations                         (1,427)        (1,180)
    Cash restricted for capital lease obligation                             1,253         (5,271)
                                                                      -------------   ------------
               Net cash provided by (used in) financing activities           3,995         (5,662)
                                                                      -------------   ------------

NET DECREASE IN CASH AND CASH EQUIVALENTS                                  (21,036)       (36,092)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD                              22,953         45,502
                                                                      -------------   ------------
CASH AND CASH EQUIVALENTS, END OF PERIOD                               $     1,917     $    9,410
                                                                      =============   ============


The accompanying notes are an integral part of these condensed consolidated financial statements.
</TABLE>


                                          - 7 -
<PAGE>


<TABLE>
NORTH AMERICAN VACCINE, INC. AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF CASH FLOWS (CONTINUED)
(IN THOUSANDS)
(UNAUDITED)
<CAPTION>
                                                                         NINE MONTHS ENDED
                                                                           SEPTEMBER 30,
                                                                     1999               1998
                                                                --------------     --------------

<S>                                                             <C>                <C>
CASH FLOWS PROVIDED BY (USED IN) OTHER WORKING CAPITAL ITEMS:

    (Increase) decrease in :
          Accounts receivable                                    $       (104)       $    (2,181)
          Inventory                                                      (390)              (390)
          Prepaid expenses and other current assets                       188               (307)

    Increase (decrease) in :
          Accounts payable                                                567               (299)
          Deferred revenue and other current liabilities                1,749                750
                                                                --------------     --------------
    Net cash provided by (used in) other working capital items   $      2,010       $     (2,427)
                                                                ==============     ==============



 SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:

 Cash paid for interest                                          $      3,572       $      3,105
                                                                ==============     ==============

  Equipment acquired through capital lease                       $        260       $          -
                                                                ==============     ==============

  Conversion of subordinated notes to common stock               $      8,408       $          -
                                                                ==============     ==============

  Use of stock to exercise stock options                         $          -       $      3,429
                                                                ==============     ==============


The accompanying notes are an integral part of these condensed consolidated financial statements.
</TABLE>


                                           - 8 -
<PAGE>


                  NORTH AMERICAN VACCINE, INC. AND SUBSIDIARIES
              NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
                                   (UNAUDITED)

1.  BUSINESS

The Company is engaged in the  research,  development,  production,  and sale of
vaccines for the  prevention of infectious  diseases in children and adults.  In
July 1998, the Company received  marketing  authorization from the U.S. Food and
Drug Administration ("FDA") to market its DTaP vaccine  (Certiva(REGISTERED)) in
the United  States for the  prevention  of  diphtheria,  tetanus,  and pertussis
(whooping  cough).  The  Company  markets  Certiva(REGISTERED)  in the  U.S.  to
government  purchasers,  including state governments and the Centers for Disease
Control and Prevention ("CDC").  Under a marketing agreement between the Company
and Abbott Laboratories ("Abbott"),  Abbott began to market  Certiva(REGISTERED)
in October  1998 to private  physicians  and managed  care markets in the United
States for immunization of infants and children. Abbott terminated the agreement
at the end of the  third  quarter  of  1999.  Previously,  in  1996,  regulatory
approval  for a  European  formulation  of  Certiva(REGISTERED)  was  granted in
Sweden,  and  regulatory  approval of a combined  DTaP-IPV  (polio)  vaccine was
granted  in  Denmark.  In April  1997,  regulatory  approval  for the  Company's
monovalent  acellular  pertussis  ("aP") vaccine to vaccinate  children was also
granted in  Sweden.  In June 1998,  the  Company  was  advised  that,  under the
European mutual recognition  procedure,  the regulatory  authorities in Germany,
Austria,  Sweden and Finland  agreed to recognize  the  marketing  authorization
granted by Denmark for the  DTaP-IPV  vaccine.  In the first half of 1999,  both
Germany and Austria  issued  their  national  marketing  authorizations  for the
Company's  DTaP-IPV vaccine pending the completion of labeling issues related to
distribution of the product. Under a marketing agreement between the Company and
Chiron-Behring GmbH & Co. ("Chiron"),  Chiron was to market the DTaP-IPV vaccine
in Germany and Austria. In October 1999, Chiron notified the Company that Chiron
is seeking to terminate the  marketing  agreement in Germany and Austria for the
Company's DTaP-IPV vaccine.  Chiron alleges that the Company  misrepresented the
status of European regulatory approval of its products and fraudulently  induced
Chiron to enter into the  agreement.  Chiron has demanded that the Company repay
$3 million of  nonrefundable  payments that Chiron made under the agreement.  If
discussions directly with Chiron do not resolve the dispute, the Company intends
to challenge Chiron's effort to terminate. The agreement between the Company and
Chiron includes an arbitration  process for resolving any such dispute,  and the
Company will avail itself of that process and will vigorously contest and defend
against  the  claims  raised by Chiron.  The  Company  believes  that the claims
against  it are  without  merit,  that  the  Company  has  meritorious  defenses
available to it, and that certain counterclaims also may be available to it.

2.  SIGNIFICANT ACCOUNTING POLICIES

(a) BASIS OF  ACCOUNTING  AND  CURRENCY.  The Company is a Canadian  corporation
incorporated under the Canadian Business Corporations Act ("CBCA") on August 31,
1989. The accompanying  consolidated  financial statements have been prepared in
accordance with generally accepted accounting  principles ("GAAP") in the United
States and are  denominated in U.S.  dollars,  because the Company  conducts the
majority of its transactions in this currency.  The application of Canadian GAAP
would  not  result  in  material  adjustments  to  the  accompanying   financial
statements  except for the impact of the  adoption  of  Statement  of  Financial
Accounting  Standards ("SFAS") No. 115, and the interest charge of $12.0 million
related to the issuance of the 4.5%  Convertible  Secured Notes due November 13,
2003 ("4.5% Notes") during the fourth quarter of 1998.  Under Canadian GAAP, the
beneficial  conversion  feature of the 4.5% Notes  would be assigned a value and
reported as additional  equity to be amortized to retained earnings ratably over


                                       9
<PAGE>

the term of the 4.5% Notes  rather than being  charged to interest in 1998.  The
effect of foreign currency translation has been immaterial.

(b)  PERVASIVENESS  OF ESTIMATES.  The  preparation  of financial  statements in
conformity with GAAP requires  management to make estimates and assumptions that
affect  the  reported  amounts  of assets  and  liabilities  and  disclosure  of
contingent  assets and  liabilities at the date of the financial  statements and
the reported amounts of revenues and expenses during the reporting period.
Actual results could differ from estimates.

(c) REVENUE RECOGNITION.  Nonrefundable fees or milestone payments in connection
with research and  development or  collaborative  agreements are recognized when
they are earned in accordance with the applicable  performance  requirements and
contract  terms.  Revenue from product sales is recognized  when all significant
risks of ownership  have been  transferred,  the amount of the selling  price is
fixed and  determinable,  all significant  related acts of performance have been
completed,  and no other significant  uncertainties  exist. In most cases, these
criteria are met when the goods are shipped.

(d) SEGMENT REPORTING.  In 1997, the Financial Accounting Standards Board issued
SFAS  No.  131,  "Disclosures  about  Segments  of  an  Enterprise  and  Related
Information."  The Company  implemented SFAS No. 131 for the year ended December
31, 1998 and has determined that it currently does not have reportable segments.
Product  sales in the United States were  approximately  $0 and $1.6 million for
the three and nine months ended  September  30, 1999,  respectively,  and $0 for
each of the same  periods in 1998.  Product  sales to Europe were  approximately
$1.2 million and $2.0 million for the three and nine months ended  September 30,
1999, respectively, and approximately $501,000 and $845,000 for the same periods
in 1998. All products are manufactured at the Company's one production  facility
in the United States. The production process, and ultimately product costing, is
primarily the same for all of the Company's acellular pertussis vaccine products
sold in the  United  States  and  Europe.  Because  of  this,  and the  relative
consistency in selling prices, as well as the nature of the distribution methods
utilized by the  Company,  the  Company  does not  differentiate  and manage its
business along geographic lines.

3. PROPERTY, PLANT AND EQUIPMENT

In September  1999,  the Company  completed a  sale/leaseback  of its only owned
facility.  The  approximately  31,000 square foot  facility,  which is used as a
warehousing and testing facility was sold for approximately  $2.1 million with a
loss on the sale of $378,000.  The lease for the facility is for an initial term
of ten years, with two five-year  renewal options.  The initial base annual rent
under the lease is approximately $237,000 with minimum annual escalations.

In March 1998, the Company leased an  approximately  75,500 square foot facility
to be  used  for  research,  development,  selling, general  and  administrative
functions and for future expansion of the Company's operations. The lease is for
an initial term of ten years,  with two five-year  renewal options.  The initial
base annual rent under the lease is  approximately  $981,000 with minimum annual
escalations.  At the end of the fifth year of the initial term,  the Company has
the right to terminate the lease for a specified  fee. In addition,  the Company
has an option to purchase the  facility  during  specified  periods of the lease


                                       10
<PAGE>


term.  The  landlord  provided  the Company a tenant  improvement  allowance  of
approximately $1.4 million.

4. INVENTORIES

Inventories  are stated at the lower of cost  (first-in,  first-out)  or market.
Components  of  inventory  cost  include  materials,  labor,  and  manufacturing
overhead.  Production  costs  attributable  to  a  product  are  expensed  until
regulatory approval is obtained for such product. Beginning in the third quarter
of 1998, costs to produce Certiva(REGISTERED) for sale in the United States were
capitalized,  except that costs attributable to  Certiva(REGISTERED)  production
under  non-regulatory  approved  optimization  production  processes  are  being
expensed  until  regulatory  approval is obtained  for such new  processes.  Any
production  costs incurred in excess of net realizable value are expensed in the
quarter in which they are incurred. Inventories consist of the following:

                                 September 30,   December 31,
                                     1999            1998
                                 ----------------------------
                                        (in thousands)

         Raw materials              $ 2,418        $ 2,509
         Work in process              1,753          1,024
         Finished goods                 286            534
                                    -------        -------
              Total                 $ 4,457        $ 4,067
                                    =======        =======

5. OTHER CURRENT LIABILITIES

Other current liabilities consisted of the following components:

                                      September 30,  December 31,
                                          1999           1998
                                      ---------------------------
                                             (in thousands)

Accrued interest                        $ 2,536        $ 1,103
Payroll and fringe benefits               2,838          1,702
Accrued taxes                               810          1,149
Reserve for contract loss                   720            720
Accrued consulting and professional fees    424            353
Accrued costs of clinical trials            245            216
Other accrued liabilities                   787            605
                                        -------        -------
Total other current liabilities         $ 8,360        $ 5,848
                                        =======        =======

6. RESTRICTED CASH AND OBLIGATIONS UNDER CAPITAL LEASE

In connection with an operating  lease for a 35,000 square foot  development and
production  facility,  the Company  entered into an agreement  that included the
purchase  and lease of  equipment  and  leasehold  improvements.  As part of the
operating lease, the Company assumed the underlying real estate leases which are
scheduled to expire in February  2001, but may be extended  through 2011.  Under


                                       11
<PAGE>


the terms of the equipment  lease,  there are certain  financial  covenants that
obligate the Company to maintain certain cash and investment balances, a minimum
tangible net worth (defined to include amounts under the outstanding convertible
subordinated  notes),  and certain other financial  ratios.  The equipment lease
agreement  permits the Company,  at its option,  to suspend the  application  of
financial covenants by posting a stand-by letter of credit, which may be revoked
by the Company  provided  certain  conditions are  satisfied.  In April 1998, as
permitted by the equipment lease  agreement,  the Company  voluntarily  posted a
letter  of  credit  in the  amount  of  $5.9  million,  thereby  suspending  the
application  of all  financial  covenants.  The letter of credit  decreases on a
monthly basis as the payments on the lease obligation are made and is secured by
a  restricted  cash  deposit of an equal  amount.  The  balance of the letter of
credit and the  corresponding  restricted  cash is $3.6 million at September 30,
1999. The letter of credit will expire by its terms on November 1, 2000.

7.  CONVERTIBLE DEBT

In November  1998,  the Company  completed a $25 million  financing  through the
private  placement of 4.5%  Convertible  Secured Notes ("4.5% Notes").  The 4.5%
Notes were sold at par,  mature on November  13,  2003 and provide for  interest
payable  semi-annually  on May 13 and November 13 of each year commencing on May
13, 1999. The net proceeds from this offering were approximately  $24.6 million.
The 4.5% Notes are  convertible,  in whole or in part,  by the  holder(s) at any
time prior to maturity (unless  previously  redeemed or repurchased) into shares
of the Company's Common Stock at the conversion price of approximately $8.54 per
share.  The 4.5%  Notes  are  secured  by  certain  assets of the  Company,  are
otherwise  subordinated  in right of payment to all existing  and future  senior
indebtedness of the Company,  do not restrict the incurrence of future senior or
other  indebtedness of the Company, and are redeemable,  in whole or in part, at
the option of the Company on or after one year from the date of issuance at par,
plus accrued interest to the redemption date.

On November 12, 1998, the date on which the 4.5% Notes were issued,  the closing
price for the  Company's  Common Stock was $12.625,  which  exceeded the initial
conversion  price  for the  4.5%  Notes.  The  difference  between  the  initial
conversion price and the fair market value per share on the date of issue of the
4.5%  Notes,  for the  number of  equivalent  shares,  has been  recognized  and
recorded as paid in capital,  with a corresponding  charge to interest  expense,
thus  increasing the effective  interest rate of the 4.5% Notes.  Given that the
4.5% Notes are immediately  convertible,  the interest  expense of approximately
$12.0  million  was  recognized   immediately  and  was  included  in  the  1998
Consolidated Statements of Operations.

In June 1999,  the Company  retired  $8.4 million  principal  amount of the 6.5%
convertible  subordinated notes ("6.5% Notes") in exchange for 550,000 shares of
Common  Stock.  As a result of the  transaction,  the Company has  recognized  a
one-time non-cash debt conversion  expense of approximately  $940,000,  which is
included in interest expense. The principal balance of the outstanding notes was
$75.3 million at September 30, 1999.


                                       12
<PAGE>


8.    LINE OF CREDIT

In July 1999,  the Company  obtained from a bank a $6 million  revolving line of
credit  maturing  December 31, 1999.  The interest rate on borrowings  under the
line of credit is LIBOR plus 265 basis points.  BioChem Pharma Inc. ("BioChem"),
an affiliate of the Company,  has provided the  guarantee of the line of credit,
which will remain in place for a maximum of two years,  unless there is a change
of control such as the  contemplated  acquisition by the third party.  (See Note
9.) Upon drawing down on the line of credit by the Company, BioChem was entitled
to receive warrants to purchase up to a total of 750,000 shares of the Company's
Common Stock.  The warrants  were issued by the Company  ratably as it drew down
under the line of credit such that BioChem received a warrant for 125,000 shares
of Common Stock for each $1 million drawn down by the Company.  Each warrant has
a term of two years  from the date of  issuance.  The per share  exercise  price
under the warrant is  approximately  $5.14,  which is the average of the closing
price of the  Company's  Common Stock on the American  Stock  Exchange over five
trading  days that  began on June 28 and  ended on July 2,  1999.  Each  warrant
contains   anti-dilution   provisions  and   registration   rights  among  other
provisions.  The  Company  drew down $4 million  and $2 million in the third and
fourth  quarters of 1999,  respectively,  under the revolving line of credit and
accordingly  has issued  warrants to purchase  750,000 shares of Common Stock to
BioChem.

The Company  will  recognize a total of  approximately  $1.6 million of interest
expense calculated using the Black-Scholes pricing model based upon the issuance
of these warrants to purchase up to 750,000 shares of common stock.  The Company
is recognizing interest expense over the life of the line of credit beginning at
the issuance date of the warrants and ending on December 31, 1999, the repayment
date for the line of credit.  The expense related to the issuance of the 500,000
warrants was $429,000 for the three months and nine months ended  September  30,
1999.

9.    SUBSEQUENT EVENT

On November 1, 1999, the Company finalized terms relating to a secured revolving
line  of  credit  from  Bank  of  America,  N.A.,  which  is  guaranteed  by  an
unaffiliated third party. The credit line made $5 million immediately  available
to the Company at an interest rate of LIBOR plus .625%. An additional  amount of
up to $25  million  will be  available  if the  Company  executes  a  definitive
acquisition  agreement  with  the  third  party,  with  whom the  Company  is in
exclusive  negotiations.  The line of credit is secured by all of the  Company's
otherwise  unencumbered  assets,  including  patents,  patent  applications  and
receivables.

The Company expects to complete negotiations  regarding a definitive acquisition
agreement  shortly,  although  there can be no assurances  that the Company will
enter  into  a  definitive  acquisition  agreement  or,  if it  does,  that  the
transaction  will  close.  Should the  Company  be unable to reach a  definitive
acquisition agreement by November 18, 1999 (unless otherwise extended by Bank of
America,  N.A.),  then the  Company  would be  required  to repay the initial $5
million  within 20 days of that date.  There are no assurances  that the Company
would be able to obtain additional  financing within that timeframe to repay the
$5 million or that such  financing,  if obtained,  would be adequate to fund the
ongoing operations of the Company.

                                       13
<PAGE>


ITEM 2. MANAGEMENT'S  DISCUSSION  AND  ANALYSIS  OF  FINANCIAL  CONDITION  AND
        ----------------------------------------------------------------------
        RESULTS OF OPERATIONS
        ---------------------

THE  FOLLOWING  PARAGRAPHS  IN THIS FORM 10-Q CONTAIN  CERTAIN  FORWARD  LOOKING
STATEMENTS, WHICH ARE WITHIN THE MEANING OF AND MADE PURSUANT TO THE SAFE HARBOR
PROVISIONS  OF THE  PRIVATE  SECURITIES  LITIGATION  REFORM  ACT OF 1995.  THESE
FORWARD LOOKING  STATEMENTS  INCLUDE,  WITHOUT  LIMITATION,  THOSE REGARDING THE
PROSPECTS  AND  TIMING FOR FILING FOR AND  OBTAINING  REGULATORY  APPROVAL,  THE
PROSPECTS FOR AND TIMING OF MARKETING AND DISTRIBUTION OF VACCINE PRODUCTS,  THE
PROSPECTS FOR AND TIMING OF INCREASING  PRODUCTION CAPACITY AND EFFICIENCY,  THE
PROSPECTS  FOR AND FACTORS  AFFECTING  FUTURE  REVENUES AND  PROFITABILITY,  THE
AVAILABILITY OF FUNDS UNDER EXISTING CREDIT  FACILITIES,  THE ABILITY TO SERVICE
THE  COMPANY'S  DEBT AND TO MEET THE  COMPANY'S  CASH FLOW NEEDS,  PROSPECTS FOR
PRODUCTION  CAPACITY,  REDUCED  PRODUCTION  COSTS,  AND THE  ABILITY TO CAMPAIGN
PRODUCTS THROUGH ITS PRODUCTION FACILITY, LIKELIHOOD OF ADDITIONAL FUNDING UNDER
LICENSE,  MARKETING,  DISTRIBUTION AND/OR DEVELOPMENT AGREEMENTS OR FROM FURTHER
FINANCINGS,  PROSPECTS  FOR AND  TIMING  FOR  ENTERING  INTO  AND  COMPLETING  A
DEFINITIVE  AGREEMENT FOR THE ACQUISITION OF THE COMPANY,  CASH REQUIREMENTS FOR
FUTURE  OPERATIONS,  PROJECTED  RESULTS OF  OPERATIONS,  AND  PROJECTED  CAPITAL
EXPENDITURES  AND COST  REDUCTIONS.  READERS ARE CAUTIONED THAT FORWARD  LOOKING
STATEMENTS  INVOLVE  RISKS,  UNCERTAINTIES,  AND  FACTORS  THAT MAY  AFFECT  THE
COMPANY'S  BUSINESS AND PROSPECTS,  INCLUDING WITHOUT LIMITATION THOSE DESCRIBED
BELOW AS WELL AS THE RISKS ASSOCIATED  WITH:  OBTAINING  REGULATORY  APPROVAL OF
PRODUCTS AND FACILITIES BY REGULATORY  AGENCIES INCLUDING THE U.S. FOOD AND DRUG
ADMINISTRATION   ("FDA");  THE  PRODUCTION  OF  VACCINES;  THE  TIMING  FOR  AND
EFFICIENCIES  RECOGNIZED  FROM  PRODUCT  CAPACITY  IMPROVEMENTS;  THE  NATURE OF
COMPETITION;  NEED FOR EFFECTIVE MARKETING;  DEPENDENCE ON SUPPLIERS,  INCLUDING
STATENS SERUM INSTITUT  ("SSI"),  AND  DISTRIBUTORS;  UNCERTAINTIES  RELATING TO
CLINICAL  TRIALS;   UNCERTAINTIES  RELATING  TO  NEGOTIATING  AND  COMPLETING  A
DEFINITIVE  AGREEMENT  FOR THE  ACQUISITION  OF THE COMPANY;  AND THE TIMING AND
NECESSITY  FOR  EXPENDITURES  AND/OR COST  REDUCTIONS,  ALL AS  DISCUSSED IN THE
COMPANY'S  FILINGS WITH THE U.S.  SECURITIES  AND EXCHANGE  COMMISSION  ("SEC"),
INCLUDING THE 1998 ANNUAL  REPORT ON FORM 10-K, TO WHICH THE READER'S  ATTENTION
IS DIRECTED.

BACKGROUND
- ----------

        The Company is engaged in the  research,  development,  production,  and
sale of vaccines  for the  prevention  of  infectious  diseases in children  and
adults. In July 1998, the Company received marketing  authorization from the FDA
to market its DTaP  vaccine  (Certiva(REGISTERED)  in the United  States for the
prevention of diphtheria,  tetanus,  and pertussis (whooping cough). The Company
markets  Certiva(REGISTERED)  in the U.S. to  government  purchasers,  including
state  governments and the Centers for Disease  Control and Prevention  ("CDC").
Under  a  marketing  agreement  between  the  Company  and  Abbott  Laboratories
("Abbott"),  Abbott  began to  market  Certiva(REGISTERED)  in  October  1998 to
private   physicians   and  managed  care  markets  in  the  United  States  for
immunization of infants and children. Abbott terminated the agreement at the end
of  the  third   quarter.   The  Company  is   currently   considering   selling
Certiva(REGISTERED)  in the United States to non-government  purchasers  through
direct  arrangements with distributors,  although no formal agreements have been
completed.

        Previously,  in 1996,  regulatory approval for a European formulation of
Certiva(REGISTERED) was granted in Sweden, and regulatory approval of a combined
DTaP-IPV  (polio)  vaccine  was  granted  in  Denmark. In April 1997, regulatory


                                       14
<PAGE>


approval for the Company's  monovalent  acellular  pertussis  ("aP")  vaccine to
vaccinate  children  was also granted in Sweden.  In June 1998,  the Company was
advised that, under the European mutual  recognition  procedure,  the regulatory
authorities  in Germany,  Austria,  Sweden and Finland  agreed to recognize  the
marketing  authorization  granted by Denmark for the  DTaP-IPV  vaccine.  In the
first half of 1999,  both Germany and Austria  issued their  national  marketing
authorizations  for the Company's  DTaP-IPV  vaccine  pending the  completion of
labeling  issues  related to  distribution  of the  product.  Under a  marketing
agreement between the Company and Chiron-Behring  GmbH & Co. ("Chiron"),  Chiron
was to market the  DTaP-IPV  vaccine in Germany and  Austria.  In October  1999,
Chiron  notified the Company that Chiron is seeking to terminate  the  marketing
agreement  in Germany and Austria for the  Company's  DTaP-IPV  vaccine.  Chiron
alleges  that the  Company  misrepresented  the  status of  European  regulatory
approval  of its  products  and  fraudulently  induced  Chiron to enter into the
agreement.   Chiron  has  demanded   that  the  Company   repay  $3  million  of
nonrefundable  payments  that Chiron made under the  agreement.  If  discussions
directly  with  Chiron do not  resolve  the  dispute,  the  Company  intends  to
challenge  Chiron's effort to terminate.  The agreement  between the Company and
Chiron includes an arbitration  process for resolving any such dispute,  and the
Company will avail itself of that process and will vigorously contest and defend
against  the  claims  raised by Chiron.  The  Company  believes  that the claims
against  it are  without  merit,  that  the  Company  has  meritorious  defenses
available to it, and that certain counterclaims also may be available to it.

        On November 1, 1999, the Company  finalized  terms relating to a secured
revolving line of credit from Bank of America,  N.A.,  which is guaranteed by an
unaffiliated third party. The credit line made $5 million immediately  available
to the Company at an interest rate of LIBOR plus .625%. An additional  amount of
up to $25  million  will be  available  if the  Company  executes  a  definitive
acquisition  agreement  with  the  third  party,  with  whom the  Company  is in
exclusive  negotiations.  The line of credit is secured by all of the  Company's
otherwise  unencumbered  assets,  including  patents,  patent  applications  and
receivables.

        The Company  expects to  complete  negotiations  regarding a  definitive
acquisition  agreement  shortly,  although  there can be no assurances  that the
Company will enter into a definitive  acquisition agreement or, if it does, that
the transaction  will close.  Should the Company be unable to reach a definitive
acquisition agreement by November 18, 1999 (unless otherwise extended by Bank of
America,  N.A.),  then the  Company  would be  required  to repay the initial $5
million  within 20 days of that date.  There are no assurances  that the Company
would be able to obtain additional  financing within that timeframe to repay the
$5 million or that such  financing,  if obtained,  would be adequate to fund the
ongoing operations of the Company.

        In April 1999, the Company announced that it had significantly shortened
the timeline for preparing and submitting an application for regulatory approval
to sell its  group C  meningococcal  conjugate  vaccine  in the  United  Kingdom
("U.K."). In October 1999, the U.K. National Health Service ("NHS") committed to
purchase 3 million doses in 2000 of NeisVac-C(TRADEMARK),  the Company's group C
meningococcal  conjugate vaccine. This commitment is  contingent  on  regulatory



                                       15
<PAGE>


approval of NeisVac-C(TRADEMARK) by the appropriate U.K. regulatory authorities.
The  Company  anticipates  that  during the fourth  quarter of 1999,  or shortly
thereafter,  it will file with the U.K.  regulatory  authorities the application
for  approval of  NeisVac-C(TRADEMARK).  The terms of the U.K.  tender  require,
among other things,  that the Company  reimburse the NHS and its  affiliates for
any costs  associated  with delays caused by the  Company  should the Company be
unable to meet agreed-upon  delivery schedules.  Beginning in the fourth quarter
of 1999, the Company will change over from Certiva(REGISTERED) and aP production
to produce the group C  meningococcal  conjugate  vaccine in anticipation of the
commercial launch of the product in the U.K.

        In May 1996,  the Company  completed  an  offering of 6.50%  Convertible
Subordinated  Notes in the principal amount of $86.25 million due in full on May
1, 2003  ("6.5%  Notes").  The 6.5%  Notes are  convertible  into  shares of the
Company's Common Stock, at an initial  conversion price of approximately  $24.86
per share,  are  subordinated  to present and future senior  indebtedness of the
Company,  do not restrict the incurrence of future senior or other  indebtedness
by the Company,  and are  redeemable,  in whole or in part, at the option of the
Company on or after May 1, 1999, at certain  pre-established  redemption prices,
plus  accrued  interest.  Upon a change in  control,  the Company is required to
offer to purchase all or part of the 6.5% Notes then  outstanding  at a purchase
price  equal  to  100% of the  principal  amount  thereof,  plus  interest.  The
repurchase price is payable in cash or, at the option of the Company,  in shares
of the Company's Common Stock. In June 1999, the Company retired $8.4 million of
the principal  amount of the 6.5% Notes in exchange for 550,000 shares of Common
Stock. The exchange was privately  negotiated with a single holder of the notes,
and resulted in the recognition of an approximately  $940,000  one-time non-cash
expense  included in interest expense for the quarter ended June 30, 1999. As of
September 30, 1999,  the  principal  amount of the  outstanding  notes was $75.3
million.

        In November  1998,  the Company  completed  a private  placement  of $25
million  aggregate  principal  amount  of 4.5%  Convertible  Secured  Notes  due
November  13,  2003  ("4.5%  Notes").  The 4.5% Notes are  convertible  into the
Company's Common Stock at a conversion  price of approximately  $8.54 per share,
are secured by certain  assets of the Company,  and  otherwise  subordinated  in
right of payment to all existing and future senior  indebtedness of the Company,
do not restrict the  incurrence  of future senior or other  indebtedness  of the
Company  and will be  redeemable,  in whole or in  part,  at the  option  of the
Company on or after  November  13, 1999.  Upon a change in control,  the Company
will be required to offer to purchase all of the 4.5% Notes then  outstanding at
a purchase  price equal to 100% of the principal  amount  thereof,  plus accrued
interest.  The repurchase price will be payable in cash or, at the option of the
Company,  in shares of the Company's Common Stock. The 4.5% Notes were issued to
certain existing  shareholders,  affiliates and accredited investors,  including
BioChem Pharma Inc.  ("BioChem") and Phillip Frost,  M.D.,  which purchased 4.5%
Notes in the principal amount of $9 million and $4.25 million,  respectively. In
addition,  Societe financiere  d'innovation inc. ("Sofinov"),  a high technology
investment  fund that is a  subsidiary  of La Caisse  de depot et  placement  du
Quebec, purchased 4.5% Notes in the aggregate principal amount of $6.25 million.
Denis Dionne, a director of the Company, is the President of Sofinov.


                                       16
<PAGE>


        In July 1999, the Company  obtained from a commercial  bank a $6 million
revolving line of credit maturing  December 31, 1999.  BioChem,  an affiliate of
the Company, has provided the guarantee of the line of credit, which will remain
in place for a maximum of two years, unless there is a change of control such as
the contemplated acquisition by the third party. The interest rate on borrowings
under the line of credit is LIBOR plus 265 basis  points.  Upon  drawing down on
the line of credit by the Company,  BioChem was entitled to receive  warrants to
purchase up to a total of 750,000  shares of the  Company's  Common  Stock.  The
warrants  were issued by the  Company  ratably as it drew down under the line of
credit such that BioChem  received a warrant for 125,000  shares of Common Stock
for each $1 million  drawn down by the  Company.  Each warrant has a term of two
years from the date of issuance. The per share exercise price under the warrants
is  approximately  $5.14,  which  is the  average  of the  closing  price of the
Company's  Common Stock on the American  Stock  Exchange  over five trading days
that  began  on  June  28 and  ended  on July 2,  1999.  Each  warrant  contains
anti-dilution  provisions and registrations  rights among other provisions.  The
Company drew down $4 million and $2 million in the third and fourth  quarters of
1999,  respectively,  under the revolving line of credit and accordingly  issued
warrants to purchase 750,000 shares of Common Stock to BioChem. The Company will
recognize a total of  approximately  $1.6 million of interest expense based upon
the issuance of these warrants to purchase up to 750,000 shares of common stock.
The Company is recognizing  interest expense over the life of the line of credit
beginning at the issuance  date of the warrants and ending on December 31, 1999,
the repayment date for the line of credit.  The expense  related to the issuance
of the 500,000  warrants,  issued prior to September 30, 1999,  was $429,000 for
the quarter and nine months ended September 30, 1999.

        In September 1999, the Company  completed a  sale/leaseback  of its only
owned facility. The approximately 31,000 square foot facility,  which is used as
a  warehousing  and testing  facility was sold for  approximately  $2.1 million,
resulting in a non-cash loss on the sale of $378,000. The lease for the facility
is for an initial term of ten years,  with two five-year  renewal  options.  The
initial base annual rent under the lease is approximately  $237,000 with minimum
annual escalations.

        The Company had 274 and 290 employees as of September 30, 1999 and 1998,
respectively.

RESULTS OF OPERATIONS
- ---------------------

THREE MONTHS ENDED SEPTEMBER 30, 1999 AND 1998

        In 1999, the Company  recognized  total revenue of $4.4 million of which
approximately  $1.2  million was from sales of product to SSI and  approximately
$3.2  million  was   collaborative   agreement   development   funding  under  a
collaborative agreement with Pasteur Merieux Connaught ("PMC").  Revenue in 1998
totaled $3.1 million of which  approximately  $501,000 was from sales of product
to SSI and the remaining from collaborative agreements.

        Production  expenses  were $5.4 million in 1999 compared to $5.1 million
in 1998. The increase in these expenses in 1999 is primarily attributable to: aP
production  under optimized  production processes  that were expensed during the


                                       17
<PAGE>


period,  increased  sales of product  to SSI,  FDA  post-marketing  surveillance
expenses, and higher contractor testing expenses. These increases were partially
offset by lower repairs and maintenance,  lower material and labor costs,  lower
royalty expenses,  and lower  depreciation  related to the use of an accelerated
depreciation  method for equipment acquired prior to 1998. Costs attributable to
Certiva(REGISTERED)  production  were  expensed  until  regulatory  approval was
obtained  in the  third  quarter  of 1998;  however,  costs  attributable  to aP
production  under  optimized  production  processes  are  being  expensed  until
regulatory  approval is obtained for such new processes.  See "Projected Results
From Operations."

        Research and development  expenses were $4.2 million in 1999 compared to
$4.7  million  in  1998.  The  decrease  is  attributable   primarily  to  lower
depreciation  expenses related to the use of an accelerated  depreciation method
for  equipment  acquired  prior to 1998,  lower  costs  associated  with the new
facility  obtained  in the  second  quarter  of 1998  because  in 1999 a smaller
portion of this facility was occupied by the research group, and lower materials
and supply expenses offset in part by higher clinical trial expenses.

        Selling,  general and administrative  expenses were $3.5 million in 1999
compared  to $2.4  million  in  1998.  In 1999,  there  was an  increase  due to
compensation  costs  as part of an  employee  retention  program,  the  $378,000
non-cash loss on the sale of a Company-owned  building,  an increase in facility
costs  associated with occupying  space in the new facility,  and legal fees and
expenses  associated with litigation  related to the Company's  former president
and with partnering opportunities.  These were partially offset by a decrease in
outside  marketing  related  costs  and  the  termination  of the  lease  of the
Company's   former   headquarters  in  July  1999,  which  were  the  result  of
management's plan to reduce costs.

        Interest and dividend income  decreased to $66,000 in 1999 from $276,000
in 1998.  This  reduction  is due  primarily  to a decrease in the average  cash
balance.

        Interest expense  increased to $2.2 million in 1999 from $1.6 million in
1998. The increase is due primarily to the amortization of costs associated with
the issuance of 500,000 warrants under the BioChem line of credit guarantee,  as
well as increased debt as a result of the issuance of the 4.5% Notes,  offset in
part by the  conversion  of $8.4 million  principal  amount of the 6.5% Notes in
exchange for 550,000 shares of Common Stock in June 1999 and principal  payments
made on the equipment lease.

        The  factors  cited  above  resulted  in a net loss of $10.8  million or
$(0.33)  per share in 1999 and a net loss of $10.5  million or $(0.32) per share
in 1998.  The  weighted-average  number of common  shares  outstanding  was 32.8
million for 1999 compared to 32.2 million for 1998. Without the $429,000 expense
recognized on the issuance of warrants and the loss on the sale of the building,
the net loss would have been $10.0 million or $(0.30) per share. The increase in
the number of  weighted-average  shares outstanding for 1999 as compared to 1998
is  attributable  primarily  to the  conversion  of some of the 6.5%  Notes into
550,000  shares of Common Stock in June 1999 and to a lesser extent the exercise
of stock options after September 30, 1998.


                                       18
<PAGE>


NINE MONTHS ENDED SEPTEMBER 30, 1999 AND 1998

        In 1999, the Company  recognized  total revenue of $7.6 million of which
approximately  $1.4 million was from  product  sales of  Certiva(REGISTERED)  to
government  agencies and $200,000 was from sales to Abbott,  approximately  $2.0
million  was from sales of product to SSI and  approximately  $4.0  million  was
under collaborative  agreements.  Revenue for 1999 from collaborative agreements
consists  primarily of $3.2 million of  development  funding under the Company's
agreement  with PMC and  recognition  of  approximately  $800,000 of development
funding from Abbott. Revenue in 1998 totaled $5.1 million of which approximately
$845,000 was from sales of product to SSI and the remaining  from  collaborative
agreements. Revenue for 1998 from collaborative agreements consists primarily of
a milestone  payment and development  funding from Abbott and to a lesser extent
milestone payments under a supply and distribution agreement with Chiron.

        Production expenses were $15.8 million in 1999 compared to $14.3 million
in 1998. The increase in these expenses in 1999 is primarily attributable to: aP
production  under optimized  production  processes that were expensed during the
period,  a total of $806,000 of write-offs of finished product due to production
failures and to a lesser  extent  non-conforming  product as a result of a third
party shipping error, FDA  post-marketing  licensing and surveillance  expenses,
higher material and labor  expenses,  and contractor  expenses.  These increases
were partially offset by lower depreciation related to the use of an accelerated
depreciation  method for equipment purchased prior to 1998, and lower repair and
maintenance and royalty  expenses.  Costs  attributable  to  Certiva(REGISTERED)
production  were expensed  until  regulatory  approval was obtained in the third
quarter of 1998; however, costs attributable to  Certiva(REGISTERED)  production
under  optimized  production  processes  are  being  expensed  until  regulatory
approval is obtained for such new processes.

        Research and development expenses were $11.8 million in 1999 compared to
$13.3  million  in  1998.  The  decrease  is  attributable  primarily  to  lower
depreciation  expenses related to the use of an accelerated  depreciation method
for equipment  acquired prior to 1998,  regulatory  consulting costs incurred in
1998 but not in 1999 in  seeking  FDA  approval  of  Certiva(REGISTERED),  lower
facility related costs  associated with the new facility  obtained in the second
quarter of 1998 because in 1999 a smaller  portion of this facility was occupied
by the research group, and lower materials and supply expense, offset in part by
higher  labor costs  attributed  to a higher  average  number of  employees  for
product  development   projects  and  the  reimbursement  of  expenses  under  a
collaborative agreement in 1998.

        Selling,  general and administrative  expenses were $8.6 million in 1999
compared  to $7.2  million in 1998.  In 1999 there was an  increase  in building
costs  associated  with the new facility  occupied  beginning  late in the third
quarter  of 1998,  an  increase  in  deferred  compensation  costs as part of an
employee  retention  program,  the non-cash loss on the sale of a  Company-owned
building,  legal fees and expenses  associated  with  litigation  related to the
Company's former president and with partnering  opportunities,  and supplies and
services costs.  These increases were partially  offset by a decrease in outside
marketing related costs and the termination of the lease of the Company's former
headquarters in July 1999, which were the result of management's  plan to reduce
costs.


                                       19
<PAGE>



        In March 1999,  the Company  sold the  remaining  125,000  shares of its
investment in IVAX  Corporation  ("IVAX") Common Stock generating gross proceeds
of approximately $1.6 million and income of $952,000.

        Interest  and  dividend  income  decreased to $446,000 in 1999 from $1.2
million in 1998.  This  reduction is due  primarily to a decrease in the average
cash balance.

        Interest expense  increased to $6.9 million in 1999 from $4.8 million in
1998.  The increase is due primarily to the $940,000  expense  recognized on the
conversion of $8.4 million  principal amount of 6.5% Notes,  increased debt as a
result of the issuance of the 4.5% Notes,  the  amortization of costs associated
with  the  issuance  of  500,000  warrants  under  the  BioChem  line of  credit
guarantee,  offset in part by the conversion of $8.4 million principal amount of
6.5%  Notes in  exchange  for  550,000  shares of Common  Stock in June 1999 and
principal payments made on the equipment lease.

        The  factors  cited  above  resulted  in a net loss of $34.1  million or
$(1.05) per share in 1999 as compared to a net loss of $33.2  million or $(1.03)
per share in 1998. The weighted-average  number of common shares outstanding was
32.5  million for 1999  compared to 32.1  million for 1998.  Without the gain on
sale of the investment in an affiliate, the expense recognized on the conversion
of some of the 6.5% Notes,  the expense  recognized  on the  issuance of 500,000
warrants, and the loss on the sale of the building, the net loss would have been
$33.3   million  or  $(1.02)   per  share.   The   increase  in  the  number  of
weighted-average shares outstanding for 1999 as compared to 1998 is attributable
primarily to the conversion of some of the 6.5% Notes into 550,000 shares of the
Company's Common Stock in June 1999 and to a lesser extent the exercise of stock
options after September 30, 1998.

LIQUIDITY AND CAPITAL RESOURCES; OUTLOOK
- ----------------------------------------

        The Company's cash  requirement  for operations for the third quarter of
1999 was $8.2  million as  compared  to $10.7  million in the second  quarter of
1999.  The decrease is due  primarily to interest  payments made in May 1999 for
the 6.5%  and  4.5%  convertible  notes.  The  Company's  cash  requirement  for
operations  is the net cash used in  operating  activities  for the period being
reported less amounts  received under license,  marketing,  distribution  and/or
development  agreements and further  adjusted by the timing of proceeds from the
sale of an investment in an affiliate.

        At September  30,  1999,  the Company had cash and cash  equivalents  of
approximately  $1.9 million.  In addition,  the Company had  approximately  $3.6
million of  restricted  cash  pledged as  collateral  under the letter of credit
agreement,  which  will be  reduced  in amount as  payments  are made  under the
equipment lease described in Note 6 of the financial statements.

        PROJECTED RESULTS FROM OPERATIONS.  The Company anticipates that it will
report a net loss of between $14 and $16 million for the fourth quarter of 1999.
It will likely  incur a quarterly  net  operating  loss in the first  quarter of
2000,  based upon  several  factors.  The  factors  included  in  assessing  the
projected losses are, among others:  limited  projected revenue primarily due to
limited   Certiva(REGISTERED)  inventory   on  hand  and   the  changeover  from


                                       20
<PAGE>


Certiva(REGISTERED)  to  group  C  meningococcal  vaccine  production;   current
manufacturing  limitations;  the  costs  required  to  accelerate  the  group  C
meningococcal  conjugate  vaccine  program;  the timing and amount of  milestone
payments  under an existing  collaboration  agreement  with PMC;  the timing and
amount of up-front and other payments under anticipated  license,  distribution,
marketing  and  collaboration   agreements;   and  the  recognition  of  expense
associated  with the  issuance of  warrants to BioChem  under its line of credit
guarantee  for the Company,  all as more  completely  discussed in the following
paragraphs.

        Quarterly  operating  results will be affected by the revenue from sales
of the  remaining  inventory of  Certiva(REGISTERED).  Revenues from the sale of
Certiva(REGISTERED)  and aP  sales  to  SSI  have  been  limited.  The  reported
Certiva(REGISTERED)  net sales  during the third,  second and first  quarters of
1999 were approximately $0, $800,000, and $800,000, respectively.  Although, the
national  marketing  authorization for the sale and distribution of its DTaP-IPV
vaccine in Germany and Austria has been completed,  labeling  amendments related
to distribution of the product have not been finalized. Until the labeling issue
and the termination issue with Chiron,  the Company's  appointed  distributor in
Germany and  Austria,  are  resolved,  the  Company  will not be able to sell aP
vaccine  to be  formulated  as  DTaP-IPV  in those  countries.  There  can be no
assurance  that  these  issues  will  be  satisfactorily  resolved,  or  that if
resolved,  any product launch will generate significant revenues in 1999 or into
2000. The Company anticipates limited revenues from  Certiva(REGISTERED)  and aP
during the  remainder  of 1999 and into 2000 due to limited  inventory  of those
products, the termination of the marketing and distribution agreement by Abbott,
and because the Company changed over from  Certiva(REGISTERED) and aP production
in  August  1999 to start  production  of the  group C  meningococcal  conjugate
vaccine in the fourth quarter of 1999 in anticipation  of the commercial  launch
of the  product in the United  Kingdom.  The Company  anticipates  filing in the
fourth quarter of 1999, or shortly  thereafter,  for regulatory  approval of the
group C meningococcal conjugate vaccine.

        As noted above,  quarterly operating results will be affected by various
manufacturing  limitations.  The  Company's  manufacturing  facility has limited
production  capacity  based  on  the  present  size,  configuration,  equipment,
processes  and  methods  utilized to  produce,  test and release its  commercial
products and its  acellular  pertussis  toxoid.  Production  expenses are mainly
fixed and  consist  primarily  of  expenses  relating  to the  operation  of its
production  facility and maintaining a ready work force.  Further,  from time to
time,  the  Company  experiences  disruptions  and  production  failures.  These
disruptions and failures increase unit production costs as units are lost in the
production  process.  These factors have contributed to higher  production costs
for the Company's  acellular  pertussis  products,  which costs currently exceed
their net  realizable  value.  These  excess  costs are  expensed in the quarter
incurred.   In  addition,   the  Company  has  not   manufactured  the  group  C
meningococcal  vaccine on a commercial scale in this facility,  and there can be
no assurance that there will not be disruptions or product failures.

        In order  to  address  these  production  limitations,  the  Company  is
implementing  a two-step  enhancement  program with respect to its production of
Certiva(REGISTERED)  and aP  vaccines.  First,  the  Company  has  modified  its
existing facilities and operations in a manner intended to significantly  expand
production   capacity  and   efficiency.   The  Company  filed  the  appropriate
documentation with the FDA in the fourth quarter of 1999 in seeking the approval
for these  enhancements.  Following  completion of this first step,  the Company
believes  that  the  manufacturing facility  will have  substantially  increased


                                       21
<PAGE>


Certiva(REGISTERED) and aP production capacity and output. The second step is to
eliminate  bottlenecks  and streamline  and  strengthen the product  testing and
release  process  thereby  reducing  production  disruptions  and  failures  and
enhancing the reliability of the production process. This work will be performed
off-line  during the  remainder  of 1999 and into early 2000,  while the group C
meningococcal vaccine is being produced in the facility. Upon completion of both
of these  programs,  the  Company  expects  that unit  production  costs will be
reduced  significantly  and  that  Certiva(REGISTERED)   could  be  produced  in
sufficient  quantities to generate a gross profit based on the  currently  known
pricing arrangements and competitive environment, and with the Company's primary
focus on governmental sales.

        As a result of a recent  assessment of potential health risks related to
mercury  contained in food and drugs  conducted by the FDA, in cooperation  with
the Environmental Protection Agency, the continued use of thimerosal in vaccines
has been questioned.  Thimerosal is a mercury-containing  preservative  commonly
used in vaccines packaged in multi-dose vials. Thimerosal is approved for use by
the FDA and is  currently  included  in more than 30  licensed  vaccines  in the
United States.  Vaccines  containing this preservative have been administered to
hundreds of millions of children and adults  worldwide,  with no  scientific  or
medical data to suggest that it poses a public  health risk.  In July 1999,  the
Company decided to follow the developing  recommendations  of these agencies and
move toward the  discontinued  use of  thimerosal  in  Certiva(REGISTERED).  The
Company  intends  to  submit  data to the  FDA on the  European  formulation  of
Certiva(REGISTERED),  which  does not  contain  thimerosal,  to  facilitate  the
approval and introduction in the United States of a thimerosal-free  formulation
of the product in single-dose syringes.  The Company is currently evaluating the
impact of this decision on the per unit cost to produce Certiva(REGISTERED),  as
well as the impact on the current  selling price.  The Company expects to submit
data to the FDA on a thimerosal-free  formulation of Certiva(REGISTERED)  before
the end of the fourth  quarter of 1999 or shortly  thereafter,  and the  Company
will work expeditiously with the FDA to obtain approval. The American Academy of
Pediatrics  has called  for the FDA to  expedite  the  review of  manufacturers'
supplemental  applications to eliminate or reduce the mercury content of vaccine
products.  The U.S. Public Health  Service,  the Centers for Disease Control and
Prevention,  and the American  Academy of Pediatrics  continue to recommend that
all  children  should  be  immunized  against  the  diseases  indicated  in  the
recommended  immunization  schedule. The Company will in the interim continue to
sell previously produced thimerosal containing  Certiva(REGISTERED)  that it has
in inventory to  government  purchasers  and possibly  through  distributors  to
private    physicians   and   has   begun   to    manufacture    thimerosal-free
Certiva(REGISTERED) in anticipation of regulatory approval.

        As  a  function  of  the  two-step  enhancement  program  for  acellular
pertussis   production  and  testing  processes,   the  regulatory  work  for  a
thimerosal-free  Certiva(REGISTERED),  and the market opportunities for a launch
of the group C meningococcal  conjugate vaccine in 2000, the Company,  beginning
in late fourth quarter 1999,  will produce its group C  meningococcal  conjugate
vaccine  for  sale  in  the  U.K.  in  the  facility  that  had  been  producing
Certiva(REGISTERED).  All costs  associated with this production  effort will be
expensed  until  regulatory  approval  is  obtained.   Because  of  the  planned
production of group C meningococcal conjugate vaccine in this facility,  neither
acellular pertussis vaccine nor  Certiva(REGISTERED)  will be manufactured until
at the earliest,  the beginning of the second  quarter of 2000.  Thus,  sales of
acellular  pertussis  containing  products  will be  limited  and may  result in
reduced sales in the second half of 1999 through the  second or third quarter of


                                       22
<PAGE>


2000 due to limited product inventory. Sales could be limited in the second half
of 2000 if the enhanced  production and testing  processes  do n0t work properly
upon startup of acellular  pertussis  production and/or the Company is unable to
reach agreements with suitable  distributors for these products in the U.S. and,
if necessary, in Germany and Austria.

        Under the  guarantee  agreement  with BioChem for the $6 million line of
credit  obtained  in July 1999,  the Company  issued  warrants to BioChem as the
Company drew down on the line of credit. The Company drew down $4 million and $2
million  in the third  and  fourth  quarters  of 1999,  respectively,  under the
revolving line of credit and  accordingly  issued  warrants to purchase  750,000
shares of  Common  Stock to  BioChem.  The  Company  will  recognize  a total of
approximately  $1.6 million of interest expense based upon the issuance of these
warrants  to  purchase  up to  750,000  shares  of  common  stock.  The  Company
recognizes interest expense over the life of the line of credit beginning at the
issuance  date of the warrants and ending on December  31, 1999,  the  repayment
date for the line of credit.  The expense related to the issuance of the 500,000
warrants,  issued  through the third quarter of 1999, was $429,000 for the three
months and nine months ended September 30, 1999.

        Finally,  future  operating  results are  dependent  upon the amount and
timing of further  milestone and other  payments under existing and new license,
distribution or development  agreements.  During 1999 and into 2000, the Company
will be continuing its development  efforts for several products,  including the
one covered by the existing  agreement  with PMC. The Company is entitled  under
the PMC agreement to milestone  payments upon  achievement of prescribed  events
and is entitled to be paid for certain prescribed development costs as incurred.
The milestone  payments under the PMC agreement are tied to measured progress in
the regulatory process for the Company's group B meningococcal vaccine. Although
initial  clinical  development  plans have been completed for this product,  and
clinical trials are projected to commence in early 2000, there are no assurances
that such  milestone  events will occur during 2000, or at all, or that any such
payments will contribute materially to quarterly net operating results.

        The foregoing  paragraphs include forward looking  statements  including
statements as to: revenue projections,  earnings (losses); timing and likelihood
of  further  regulatory  approvals;  the  ability  of the  Company to timely and
efficiently   expand  its   production   capacity   and  lower  unit  costs  for
Certiva(REGISTERED);  the  prospects  for and  timing  of group C  meningococcal
conjugate  vaccine  production  and  regulatory  filings;  the prospects for and
timing of milestone payments under an existing collaborative  agreement; and the
ability  of  the   Company   to  address   production   failures   relating   to
Certiva(REGISTERED)  production, among others. The factors that affect the level
of future revenues from product sales include,  among other things,  the ability
of the Company to obtain  distribution  partners for  pertussis  products in the
U.S. and, if necessary,  Germany and Austria,  and for the group C meningococcal
vaccine in the U.K., the ability of the Company and its distribution partners to
effectively   position  the  Company's  products  against  competitive  products
(including safety,  efficacy, and pricing), the Company's ability to manufacture
and deliver  pertussis and group C meningococcal  vaccine products in accordance
with customer orders, the timing and amount of product orders, and the timing of
future product  launches.  The factors that affect the ability of the Company to
timely and efficiently expand its production capacity include, among others, the
adequacy  of  engineering  designs,  the  manufacturing  experience  with  these
enhancements,  the  timeliness  of  regulatory  review  of  modifications,   the


                                       23
<PAGE>


acceptability of such  modifications to the applicable  regulatory  authorities,
and the ability to  successfully  streamline and strengthen the product  testing
and release  process.  There can be no assurances  that the  Company's  plans to
increase  production  capacity  and  output  will  be  effective  or  result  in
anticipated production  efficiencies and reduced unit cost or will be acceptable
to any  regulatory  agency.  The factors  affecting  prospects for and timing of
milestone payments under an existing collaborative  agreement include regulatory
authorization  to  commence  clinical  trials and  adequacy  of  clinical  trial
results.  The  factors  affecting  timing for  commercialization  of the group C
meningococcal   conjugate  vaccine  include,  among  other  things,   successful
changeover in the  manufacturing  facility,  results of ongoing clinical trials,
and expedited UK regulatory  review.  In addition,  there are no assurances that
the steps taken by the Company to address  production  disruptions  and failures
and  quality  testing   inefficiencies  for  both  the  pertussis  and  group  C
meningococcal  vaccines  will be effective or that  disruptions,  failures,  and
inefficiencies will not continue in the future. Production disruptions, failures
or  inefficiencies  could have a material adverse effect on the Company's future
operating  results and could affect the Company's  existing  licenses as well as
any  applications  for approval for its products or the timing of such approval.
No assurances  can be given that the Company will be  successful in  maintaining
consistent  and  continuous  commercial  production  of its  products.  Further,
because the Company's  manufacturing  operations are located  principally in one
facility,  any  condition  or event that  adversely  affects  the  condition  or
operation of such facility would have a material adverse affect on the Company's
financial condition and future results of operations.

        PROJECTED CASH  REQUIREMENTS FOR OPERATIONS.  The cash  requirements for
operations in the fourth quarter of 1999 are projected to be between $13 and $15
million.  This range could be  affected  by the timing and amount of  additional
cash requirements  associated with the acceleration of the group C meningococcal
conjugate vaccine  development  program.  The fourth quarter cash requirement is
anticipated  to be higher than that  incurred  in the third  quarter of 1999 due
primarily to the semi-annual  interest payment of $2.4 million on the 6.5% Notes
and the  approximately  $600,000 payment for the 4.5% Notes both due in November
1999. The above cash  requirements do not include the repayment of the revolving
line of credit,  guaranteed  by BioChem,  which expires  December 31, 1999,  the
balance of which was $6 million at  November  5,  1999.  The  foregoing  include
forward looking statements and the factors which affect the actual cash required
for operations could include,  among other things:  vaccine  production  levels;
regulatory  authorization to commence  clinical  investigations;  timing for the
commencement of planned clinical  trials;  and the level of expenditures for the
Company's  ongoing  research  and  development   program,   which  includes  the
acceleration  of the  group  C  meningococcal  conjugate  vaccine  program.  See
"Funding Sources," below.

        CAPITAL  EXPENDITURES.  Total  capital  expenditures  for the first nine
months of 1999 were $2.9 million  which  includes a $260,000  capital  lease for
equipment.  As noted above, the Company has expanded its manufacturing  capacity
and efficiency for its acellular pertussis toxoid and Certiva(REGISTERED) and is
planning to produce the group C meningococcal conjugate vaccine beginning in the
fourth quarter of 1999. Total projected  capital  expenditures for the remainder
of 1999 for minor  ongoing  facilities'  modifications,  equipment,  systems and
other  capital  additions are  approximately  $800,000.  The  foregoing  include
forward looking  statements.  The amount of and timing for capital  expenditures
could fluctuate based upon a number of factors  including,  without  limitation,
the equipment  purchases  required in order to produce the group C meningococcal
conjugate vaccine; and the amount and timing of unanticipated costs to replace


                                       24
<PAGE>


or repair existing equipment and systems in order to keep facilities operational
and in compliance with regulatory requirements.

        FUNDING  SOURCES.  To  maintain  the  Company's  production,   research,
development  and growth at current  levels,  present cash and cash  equivalents,
expected product sales of Certiva(REGISTERED)  and the Company's other products,
and revenues from existing collaborative  agreements are not expected to provide
sufficient  cash to fund the  Company's  operations,  debt service  payments and
capital  expenditures  for the  remainder of 1999 and into 2000.  To address the
cash needs, the Company obtained a secured revolving line of credit from Bank of
America,  N.A. The Company has received $5 million under the line of credit.  An
additional amount of up to $25 million will be available if the Company executes
a definitive  acquisition agreement with the unaffiliated third party, with whom
the Company is in exclusive negotiations. The line of credit has been guaranteed
by the third party and is secured by all of the Company's otherwise unencumbered
assets, including patents, patent applications and receivables.

        Should the Company be unable to reach a definitive acquisition agreement
by November 18, 1999 (unless otherwise extended by Bank of America,  N.A.), then
the Company would be required to repay all  outstanding  indebtedness  under the
borrowing  agreement  within 20 days of that date.  There are no assurances that
the Company would be able to obtain  additional  financing within that timeframe
to repay the $5 million or that such financing,  if obtained,  would be adequate
to fund  the  ongoing  operations  of the  Company.  If the  Company  signs  the
definitive  acquisition  agreement and secures the  additional  $25 million,  it
believes  that it will meet 1999 and first  quarter 2000 cash  requirements  for
operations  with this line of credit,  although  there are no assurances in this
regard. The foregoing include forward looking  statements,  and the factors that
will  determine the timing and amount of  additional  funding  include,  without
limitation,  the  satisfaction  of  certain  conditions  to  the  signing  of  a
definitive acquisition agreement with the third party.

        If the  Company is unable to  complete  the  transaction  with the third
party noted above,  the Company would be required to obtain  additional  funding
through a borrowing  arrangement with one or more of its affiliates, through the
sale of debt and/or equity securities  and/or reduce cash  requirements  through
significant  reductions in operating levels. There can be no assurances that the
Company will be able to obtain debt or equity  financing  on favorable  terms in
amounts  required to meet future cash  requirements  and the amounts  owed under
outstanding lines of credit in the timeframe  required,  or that the Company, if
necessary,  would be  successful  in reducing  operating  levels or  effectively
controlling costs, or that if operating levels are reduced, the Company would be
able to maintain operations for any extended period of time.

        The  foregoing  paragraphs  contain  only a partial  description  of the
factors  affecting the Company's  business  prospects and risk factors affecting
future  operations.  Reference is made to the risk factors and other information
described  elsewhere in this  management's  discussion and analysis of financial
condition and results of operations,  including in the first  paragraph  hereof,
and in the Company's other filings with the SEC, for a more complete description
of the risks and uncertainties affecting the Company and its business.


                                       25
<PAGE>


TAX AND REPORTING MATTERS
- -------------------------

        At December 31, 1998,  the Company and its  subsidiaries  had income tax
loss carry  forwards of  approximately  $38.2 million to offset future  Canadian
source  income and  approximately  $93.2  million to offset future United States
taxable  income  subject  to the  alternative  minimum  tax rules in the  United
States.

        If more  than a certain  percentage  of the  Company's  assets or income
becomes  passive,  the Company  will be  classified  for U.S.  tax purposes as a
passive foreign investment company ("PFIC"),  and a U.S. taxpayer may be subject
to an additional  Federal  income tax on receiving  certain  dividends  from the
Company  or  selling  the  Company's  Common  Stock.  The  Company  has not been
classified  as a PFIC to date,  and it  intends  to, and  believes  that it can,
generate  sufficient other income to avoid being classified as a PFIC. This is a
forward looking statement and the factors affecting this classification include,
among other  things,  the timing and amount of revenue from product  sales;  the
timing and amount of license fees,  milestone  payments and development  funding
under  license,   marketing,   distribution  and  development  agreements;   the
classification of payments received by the Company as active or passive; and the
classification of the Company's assets as active or passive.

        In June 1997, the FASB issued SFAS No. 131,  "Disclosures about Segments
of an Enterprise and Related  Information." The Company implemented SFAS No. 131
for the year ended December 31, 1998 and has  determined  that it currently does
not have reportable  segments.  There were no product sales in the United States
for the quarters  ended  September  30, 1999 and 1998,  and  approximately  $1.6
million and $0 for the nine months  periods  ended  September 30, 1999 and 1998,
respectively.  Product  sales  to  Europe,  which  were  all  made to SSI,  were
approximately  $1.2 million and $501,000 for the quarters  ended  September  30,
1999 and 1998, respectively, and approximately $2.0 million and $845,000 for the
nine months ended  September 30, 1999 and 1998,  respectively.  All products are
currently  being  manufactured  at the Company's one production  facility in the
United  States.  The production  process,  and ultimately  product  costing,  is
primarily the same for all of the Company's acellular pertussis vaccine products
sold in the  United  States  and  Europe.  Because  of  this,  and the  relative
consistency in selling prices, as well as the nature of the distribution methods
utilized by the  Company,  the  Company  does not  differentiate  and manage its
business along geographic lines.

        The  Company  has  been   notified  by  the  American   Stock   Exchange
("Exchange")   that  it  was  considering   delisting  the  Company  because  of
non-compliance  with its listing  requirements.  The  Exchange  has deferred its
judgment on delisting until it has reviewed the Company's  Annual Report on Form
10-K for the year ending December 31, 1999. If the proposed transaction with the
potential  acquiror is not entered  into or  consummated,  then the Exchange has
requested that the Company provide it with additional  information regarding its
financial condition.

IMPACT OF THE YEAR 2000 ISSUE ON THE COMPANY
- --------------------------------------------

        The Year 2000 issue is the result of some computers,  software and other
equipment,  including  computer code, in which calendar year data is abbreviated
to only two digits.  Management has initiated a company-wide  program to prepare
the  Company's  information  systems  for the year  2000.  Based on an  internal
assessment,  the Company  believes  that the  principal  management  information


                                       26
<PAGE>


system  software  that is  currently  being  used is  designed  to be Year  2000
compliant.  However,  there can be no  assurances  in this  regard.  The Company
intends to test the  system  for Year 2000  compliance.  The  Company  also uses
various "off the shelf"  software  applications  for the storage and analysis of
various types of data and systems.  Management is dependent on this software for
day-to-day   operations.   The  Company  has  completed  the  inventory  of  its
information   technology  and  date-sensitive  systems  and  has  completed  the
assessment  phases and has substantially  completed the required  remediation of
noncompliant,  mission-critical systems to achieve Year 2000 qualification. This
process is nearing  completion;  however,  the Company is unable at this time to
assess  the  impact,  if any,  that  non-compliant  systems or  equipment  might
ultimately have on the Company's  systems and operations or its future financial
position or results of operations.

        The Company has communicated  with  substantially all of its significant
suppliers to determine the extent to which the Company is vulnerable to failures
by such third parties to remediate  their own Year 2000 issues.  The Company has
not been advised by its suppliers that costs to obtain Year 2000 compliance will
be passed on to the Company; however, there can be no assurances that such costs
will not be passed through to the Company  either  directly or indirectly or, if
passed  through to the Company,  the magnitude of such  charges.  The systems of
other companies on which the Company's systems rely may not be timely converted.
Accordingly,  there are no assurances that the failure by such other  companies'
systems  to achieve  Year 2000  qualification,  or  qualify in a manner  that is
compatible to Company  systems,  would not have a material adverse effect on the
Company.  The  Company is  finalizing  contingency  plans for  various  possible
scenarios.

        The Company  has  determined  that it has no  exposure to  contingencies
related to the Year 2000 Issue for  product it has sold.  Based on the  internal
assessment,  the Company has not identified  any material costs or  expenditures
specifically  related to  modifications  of  information  systems  for Year 2000
compatibility.  This internal assessment is a continuing  process,  consequently
there can be no  assurances  that the  Company  will not be  required  to expend
significant   amounts  on  achieving  Year  2000   qualification  or  that  such
expenditures  will not have a material  adverse  affect on future  results  from
operations or financial condition.

        The foregoing  paragraphs  contain  forward  looking  statements and the
factors affecting the impact of Year 2000 on the Company include,  among others,
the availability and cost of programming and testing resources, vendors' ability
to modify proprietary software, unanticipated problems identified in the ongoing
compliance  assessment,  and  compliance of material  third party  suppliers and
vendors.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK
        ----------------------------------------------------------

        The Company  does not have  significant  exposure  to changing  interest
rates on invested  cash at  September  30,  1999.  The  Company  invests in U.S.
Treasury bills and investment  grade  commercial  paper that have  maturities of
three months or less.  As a result,  the interest  rate market risk  implicit in
these  investments  at September  30, 1999,  is low, as the  investments  mature
within three months.


                                       27
<PAGE>


        The Company had $25 million of 4.5% Notes at September  30, 1999,  which
bear  interest at 4.5% per annum and mature in November  2003.  The Company does
not have  significant  exposure to changing  interest  rates related to the 4.5%
Notes because the interest rate on these notes is fixed.

        The Company had $75.3 million of 6.5% Notes at September 30, 1999, which
bear  interest at 6.5% per annum and mature in May 2003.  The  Company  does not
have significant  exposure to changing  interest rates related to the 6.5% Notes
because the interest rate on these notes is fixed.

        The  Company  has drawn down a total of $6 million in three  equal draws
under the  revolving  line of  credit  guaranteed  by  BioChem.  The loans  bear
interest at LIBOR plus 265 basis points,  which are currently  between 8.06% and
8.09%.  Each draw under the line is an individual  revolving  loan. New interest
rates and  periods  will be  determined  when  these  loans  mature.  The entire
principal  balance on the line of credit  must be repaid no later than  December
31, 1999. The Company has exposure to changing  interest rates related to the $6
million of debt but does not deem it material due to the time limitations on the
borrowing.

        The Company drew down $5 million in November 1999 under a revolving line
of credit  guaranteed  by a third party.  The loan bears  interest at LIBOR plus
 .625%.  The Company has exposure to changing  interest  rates  related to the $5
million of debt but does not deem it material due to the time limitations on the
borrowing.

        The Company has not undertaken any actions to cover interest market risk
and is not a party to any interest rate market risk management activities.

        A hypothetical  ten percent change in the market interest rates over the
next year would not materially impact the Company's earnings or cash flow as the
interest  rates on the Company's  long-term  convertible  debt are fixed and its
revolving line of credit and cash investments are short term. A hypothetical ten
percent change in the market interest rate over the next year, by itself,  would
not have a material adverse effect on the fair value of the Company's  long-term
convertible debt, revolving line of credit or its short-term cash investments.

        The Company does principally all of its transactions in U.S. dollars and
currently has limited  payment  obligations  in Swedish Krona and Danish Kroner;
however,  such  obligations  are not material to the  Company's  operations.  In
addition,  the  Company's  contract with the NHS in the U.K. is  denominated  in
British  pounds  sterling.  The  Company  intends to reduce risk due to possible
changes in exchange  rates  between the  currencies  by entering  into a hedging
transaction before the effective date of the contract.



                                       28
<PAGE>


                           PART II. OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS
        -----------------

Sharon Mates, the Company's former president,  continues to pursue her appeal of
the  judgment  that the Company had  obtained  its favor from the U.S.  District
Court in  Maryland.  The appeal is pending in the U.S.  Court of Appeals for the
Fourth Circuit. Dr. Mates's original counsel,  however, has withdrawn from their
representation,  causing Dr. Mates to apply for an extension of time to find new
counsel and file her brief.  On October 15, 1999, the Fourth Circuit granted Dr.
Mates's motion, giving her until November 18, 1999, to file her brief.

The lawsuit was filed by Dr. Mates in November 1998 and included  claims against
the Company  and two  directors  for,  among other  things,  abusive  discharge,
defamation,  interference with business  relations,  and breach of contract.  In
December  1998,  the  Company  filed a motion to  dismiss  on the basis that the
allegations  in the complaint did not state any claim under  applicable  law. In
June 1999, the U.S. District Court in Maryland dismissed all claims filed by Dr.
Mates,  as well as the  claims  filed  against  the two named  directors  and an
affiliate,  BioChem  Pharma Inc.  ("BioChem").  In July 1999,  Dr. Mates filed a
notice of appeal.

In October 1999,  Chiron-Behring GmbH & Co. ("Chiron") notified the Company that
Chiron is seeking to terminate  the  marketing  agreement in Germany and Austria
for  the  Company's   DTaP-IPV   vaccine.   Chiron   alleges  that  the  Company
misrepresented  the status of European  regulatory  approval of its products and
fraudulently  induced  Chiron to enter into the  agreement.  Chiron has demanded
that the Company  repay $3 million of  nonrefundable  payments  that Chiron made
under the  agreement.  If  discussions  directly  with Chiron do not resolve the
dispute,  the Company  intends to challenge  Chiron's  effort to terminate.  The
agreement  between the Company and Chiron  includes an  arbitration  process for
resolving  any such  dispute,  and the Company will avail itself of that process
and will vigorously  contest and defend against the claims raised by Chiron. The
Company believes that the claims against it are without merit,  that the Company
has meritorious  defenses  available to it, and that certain  counterclaims also
may be available to it.

ITEM 2. CHANGES IN SECURITIES AND USE OF PROCEEDS
        -----------------------------------------

In July 1999 the Company obtained a $6 million revolving line of credit maturing
December 31, 1999.  The interest rate on borrowings  under the line of credit is
LIBOR plus 265 basis points.  BioChem, an affiliate of the Company, has provided
the guarantee of the line of credit, which will remain in place for a maximum of
two  years,  unless  there  is a  change  of  control  such as the  contemplated
acquisition  by the third  party.  The  Company  issued to BioChem  warrants  to
purchase a total of 500,000 shares of the Company's  Common Stock in reliance on
Section 4(2) of the  Securities  Act,  related to draws of $4 million  under the
line of credit through  September 30, 1999. An additional  250,000 warrants have
been issued by the Company to BioChem for the draw of the  remaining  $2 million
under the line during the fourth quarter of 1999. Each warrant has a term of two
years from the date of issuance. The per share exercise price under each warrant
is  approximately  $5.14,  which  is the  average  of the  closing  price of the
Company's  Common Stock on the American  Stock  Exchange  over five trading days
that  began  on  June  28 and  ended  on July 2,  1999.  Each  warrant  contains
anti-dilution provisions and registrations rights among other provisions.



                                       29
<PAGE>



ITEM 6. EXHIBITS AND REPORTS ON FORM 8-K
        --------------------------------

        (a)  Exhibits

             Exhibit No.     Description


                  10.45      Common Stock Purchase  Warrant No. W-2 dated August
                             26, 1999

                  10.46      Common Stock Purchase Warrant No. W-3 dated October
                             28, 1999

                  10.47      Revolving  Credit Facility  Letter  Agreement dated
                             November  1, 1999 by and  between  Bank of America,
                             N.A. and North American Vaccine, Inc.

                  10.48      Fee Letter  dated  November  1, 1999

                  10.49      Security  Agreement dated as of November 1, 1999 by
                             and between North American  Vaccine,  Inc. and Bank
                             of  America,   N.A.

                  10.50      Security  Agreement  dated as of  November  1, 1999


                  10.51      Patent  and  Trademark   Assignment   and  Security
                             Agreement  dated  as of  November  1,  1999  by and
                             between North  American  Vaccine,  Inc. and Bank of
                             America,    N.A.

                  10.52      Patent  and  Trademark   Assignment   and  Security
                             Agreement  dated  as  of  November  1,  1999

                  10.53      Guaranty  Agreement  dated  November  1, 1999

                  10.54      Reimbursement  Agreement  dated  as  of November 1,
                             1999

                  27         Financial Data Schedule



        (b)  Reports on Form 8-K

             None



                                       30
<PAGE>



                                   SIGNATURES


         Pursuant to the  requirements  of the Securities  Exchange Act of 1934,
the  registrant  has duly  caused  this report to be signed on its behalf by the
undersigned thereunto duly authorized.


                              NORTH AMERICAN VACCINE, INC.
                              ----------------------------
                                  (Registrant)


                              By: /s/ Randal D. Chase
                                  ------------------------
                                  Randal D. Chase, Ph.D.
                                  President and Chief Executive Officer


                              By: /s/ Lawrence J. Hineline
                                  ------------------------
                                  Lawrence J. Hineline
                                  Vice President - Finance














Date:  March 9, 2000



                                       31


 THIS WARRANT AND THE COMMON SHARES ISSUABLE UPON EXERCISE HEREOF HAVE NOT BEEN
      REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR UNDER THE
   SECURITIES LAWS OF ANY STATE OF THE UNITED STATES OR PROVINCE OF CANADA AND
        SUCH SECURITIES MAY NOT BE SOLD, PLEDGED OR OTHERWISE TRANSFERRED
    IN THE ABSENCE OF SUCH REGISTRATION OR AN APPLICABLE EXEMPTION THEREFROM


                          NORTH AMERICAN VACCINE, INC.

                    Warrant for the Purchase of Common Shares
                    -----------------------------------------

No.  W-2                                                          250,000 Shares
     ---

     FOR VALUE  RECEIVED,  NORTH  AMERICAN  VACCINE,  INC.  (the  "Company"),  a
Canadian corporation, hereby certifies that BioChem Pharma Inc. or its permitted
assigns (the "Holder") is entitled to purchase from the Company,  at any time or
from time to time after the date set forth on the signature  page,  but prior to
5:00 p.m. on August 13, 2001,  two hundred fifty thousand  (250,000)  fully paid
and non-assessable  common shares, no par value, of the Company for an aggregate
purchase  price of One Million Two Hundred  Eighty-Four  Thousand  Three Hundred
Seventy-Five U.S. Dollars (US$1,284,375) (computed on the basis of US$5.1375 per
share).  (Hereinafter,  (i) said common  shares,  together with any other equity
securities  which may be issued by the  Company in  substitution  therefor,  are
referred  to as  the  "Common  Shares":,  (ii)  the  Common  Shares  purchasable
hereunder are referred to as the "Warrant Shares",  (iii) the aggregate purchase
price payable  hereunder for the Warrant Shares is referred to as the "Aggregate
Warrant Price", (iv) the price payable hereunder for each of the Warrant Shares,
as  adjusted  in the manner set forth in Section 3, is  referred  to as the "Per
Share Warrant Price" and (v) this Warrant and all warrants  hereafter  issued in
exchange or substitution for this Warrant are referred to as the "Warrants") The
Aggregate  Warrant  Price is not subject to  adjustment.  The Per Share  Warrant
Price and the number of Warrant  Shares are subject to adjustment as hereinafter
provided.

     1. EXERCISE OF WARRANT. This Warrant may be exercised, in whole at any time
or in part from time to time  (such  partial  exercises  to be in amounts of not
less  than  1,000  Warrant  Shares),  on and  after  the date  set  forth on the
signature page, but prior to 5:00 p.m. on August 13, 2001, by the Holder of this
Warrant by the surrender of this Warrant (with the subscription  form at the end
hereof duly  executed) at the  principal  office of the Company in Columbia,  MD
together with proper payment of the Aggregate  Warrant Price  applicable on such
date,  or the  proportionate  part thereof if this Warrant is exercised in part.
Payment for Warrant  Shares  shall be made by (i) check  payable to the order of
the Company,  (ii) wire transfer to an account  designated by and in the name of
the Company, (iii) by delivery to the Company of debt securities for which it is
the issuer and bound to make payment in the stated principal  amount,  where the
principal  amount on such debt security  delivered to the Company for retirement
is equal to the  Aggregate  Warrant  Price;  or (iv) by any  combination  of the
methods set forth in (i) through (iii),  above.  If this Warrant is exercised in
part, this Warrant must be exercised for a number of whole Warrant  Shares,  and
the Holder is entitled to receive a new Warrant  covering  the number of Warrant


                                     - 1 -
<PAGE>


Shares in respect of which this Warrant has not been exercised and setting forth
the proportionate part of the Aggregate Warrant Price applicable to such Warrant
Shares.  Upon  such  surrender  of  this  Warrant,  the  Company  will  issue  a
certificate or  certificates in the name of the Holder for the largest number of
whole Warrant  Shares to which the Holder shall be entitled and, if this Warrant
is  exercised in whole,  in lieu of any  fractional  Warrant  Share to which the
Holder shall be entitled,  cash equal to the fair value of such fractional share
(determined in such  reasonable  manner as the Board of Directors of the Company
shall determine).

     2.  RESERVATION OF WARRANT  SHARES.  The Company agrees that,  prior to the
expiration of this Warrant,  the Company will at all times have  authorized  and
reserve,  and will keep  available,  solely for  issuance or  delivery  upon the
exercise of this Warrant,  the Warrant Shares free and clear of all restrictions
on sale or transfer (except as may arise under  applicable  securities laws) and
free and clear of all preemptive rights.

     3. PROTECTION  AGAINST  DILUTION.  (a) If, at any time or from time to time
after the date of this  Warrant,  the Company  shall (i) issue to the holders of
the Common Shares any Common Shares by way of a stock  dividend;  (ii) subdivide
its outstanding Common Shares into a greater number of shares; (iii) combine its
outstanding number of Common Shares into a smaller number (i.e., a reverse stock
split);  or (iv) issue by  reclassification  of its Common  Shares any shares of
capital stock of the Company then,  and in each such case, the Per Share Warrant
Price in effect  immediately prior to the date of such action shall be adjusted,
or further adjusted, to a price (to the nearest cent) determined by dividing (x)
an amount equal to the number of Common Shares outstanding  immediately prior to
such issuance  multiplied  by the Per Share Warrant Price in effect  immediately
prior to such  issuance  by (y) the total  number of Common  Shares  outstanding
immediately  after such issuance.  Upon each adjustment in the Per Share Warrant
Price  resulting  from a stock  split or stock  dividend,  the number of Warrant
Shares  shall be adjusted by dividing  the  Aggregate  Warrant  Price by the Per
Share Warrant Price in effect immediately after such adjustment.  Notice of each
such  adjustment  and each such  readjustment  shall be forthwith  mailed to the
Holder.

     (b) If the  Company  shall be  consolidated  with or  merged  into  another
corporation,  or shall sell all or substantially  all of its assets as part of a
reorganization  to which  the  Company  is a party  within  the  meaning  of the
Internal Revenue Code of 1986, as presently in effect, or shall issue a security
convertible  into its Common  Shares as a dividend  on its Common  Shares,  each
Warrant  Share shall be replaced for the purposes  hereof by the  securities  or
properties  issuable  or  distributed  in respect of one Common  Share upon such
consolidation,  merger, sale,  reclassification or reorganization,  and adequate
provisions  to that  effect  shall be made at the time  thereof.  Notice of such
consolidation,  merger,  sale,  reclassification or reorganization,  and of said
provisions  so proposed to be made,  shall be mailed to the Holder not less than
15 days prior to such event.

     (c) If the Board of Directors of the Company  shall declare any dividend or
other distribution in cash with respect to the Common Shares,  other than out of
surplus,  the Company  shall mail notice  thereof to the Holder not less than 15


                                     - 2 -
<PAGE>

days prior to the record  date fixed for  determining  shareholders  entitled to
participate in such dividend or other distribution.

     (d) If , during the term of this  Warrant,  the Company shall issue or sell
its Common Shares for a consideration  per share less than the Per Share Warrant
Price  immediately  prior to the time of such issue or sale, then forthwith upon
such issue or sale, the Per Share Warrant Price in effect  immediately  prior to
such issue or sale shall be  reduced to the lower of the prices  (calculated  to
the nearest cent) determined as follows:

          (1) by  dividing  (A) an amount  equal to the sum of (i) the number of
shares of  Common  Stock  outstanding  immediately  prior to such  issue or sale
multiplied  by  the   then-existing  Per  Share  Warrant  Price,  and  (ii)  the
consideration,  if any,  received by the Company upon such issue or sale, by (B)
the total number of Common Shares  outstanding  immediately  after such issue or
sale; and

          (2) by multiplying  the Per Share Warrant Price in effect  immediately
prior to the time of such issue or sale by a fraction,  the  numerator  of which
shall be (A) the sum of (i) the number of Common Shares outstanding  immediately
prior to such issue or sale multiplied by the market price  immediately prior to
such issue or sale; and (ii) the consideration received by the Company upon such
sale, divided by (B) the total number of Common Shares  outstanding  immediately
after such issue or sale, and the denominator of which shall be the market price
immediately prior to such issue or sale.

     4. FULLY PAID  SHARES;  TAXES.  The Company  agrees that the Common  Shares
represented by each and every  certificate  for Warrant Shares  delivered on the
exercise of this Warrant shall, at the time of such delivery,  be validly issued
and outstanding,  fully paid and  non-assessable.  The Company further covenants
and agrees that it will pay, when due and payable, any and all Federal and state
stamp,  original  issue or similar  taxes which may be payable in respect of the
issue of any Warrant Share or certificate therefor.

     5. TRANSFERABILITY.  This Warrant and the Warrant Shares shall not be sold,
transferred,  assigned or  hypothecated  by the Holder except (i) pursuant to an
effective  registration  statement under the Securities Act of 1933, as amended,
and  qualification  for sale  under all other  applicable  state and  provincial
securities rules and regulations  [collectively the "Securities  Acts"]; or (ii)
in full  compliance  with all  requirements  necessary to establish an exemption
from the registration  requirements of the Securities Acts. In order to properly
establish  compliance with (ii), above, the Company shall be entitled to request
and  receive  in  advance  of  authorizing  any sale,  transfer,  assignment  or
hypothecation  of this  Warrant or any of the Warrant  Shares:  (x)  appropriate
transferor and transferee  representation letters supporting a claimed exemption
from registration requirements of the Securities Acts; (y) an opinion of counsel
for the holder of the Warrant and/or Warrant Shares  reasonably  satisfactory to
the Company that the  proposed  transfer  from the holder of the Warrant  and/or
Warrant Shares to the transferee is exempt from the registration requirements of
the  Securities  Act;  and (z) such  other  documentation,  representations  and


                                     - 3 -
<PAGE>

filings as may be reasonably required by counsel in order to issue the foregoing
opinion.  The  Company  may treat the  registered  holder of this  Warrant as it
appears on the Company's books at any time as the Holder for all purposes.

     6. LOSS,  ETC. OF WARRANT.  Upon  receipt of evidence  satisfactory  to the
Company of the loss,  theft,  destruction or mutilation of this Warrant,  and of
indemnity reasonably  satisfactory to the Company, if lost, stolen or destroyed,
and upon  surrender and  cancellation  of this Warrant,  if mutilated,  and upon
reimbursement of the Company's reasonable incidental expenses, the Company shall
execute  and  deliver  to the  Holder a new  Warrant  of like  date,  tenor  and
denomination.

     7. WARRANT HOLDER NOT  SHAREHOLDER.  Except as otherwise  provided  herein,
this  Warrant does not confer upon the Holder any right to vote or to consent or
to receive  notice as a shareholder  of the Company,  as such, in respect of any
matters whatsoever,  or any other rights or liabilities as a shareholder,  prior
to the exercise hereof.

     8. COMMUNICATION. No notice or other communication under this Warrant shall
be effective unless,  but any notice or other  communication  shall be effective
and shall be deemed to have been given if, the same is in writing  and is mailed
by first-class mail, postage prepaid, addressed to:

     (a) the Company at North American  Vaccine,  Inc., 10150 Old Columbia Road,
Columbia, MD 21046 Attention:  Vice President-Finance,  or such other address as
the Company has designated in writing to the Holder, or

     (b) the Holder at BioChem  Pharma  Inc.,  275  Armand  Frappier  Boulevard,
Laval, H7V 4A7 Quebec, Canada Attention:  Executive Vice President-Investments &
Subsidiaries,  or such other address as the Holder has  designated in writing to
the Company.

     9. HEADINGS. The headings of this Warrant have been inserted as a matter of
convenience and shall not affect the construction hereof.

     10.  APPLICABLE  LAW.  This Warrant  shall be governed by and  construed in
accordance with the laws of the State of New York.


                                     - 4 -
<PAGE>


     IN WITNESS WHEREOF, NORTH AMERICAN VACCINE, INC. has caused this Warrant to
be signed by its Senior Vice  President-Legal  Affairs & General Counsel and its
corporate  seal to be hereunto  affixed and attested by its Secretary  this 26th
day of August, 1999.

ATTEST:                                     NORTH AMERICAN VACCINE, INC.



/s/ Russell P. Wilson                       By: /s/ Daniel J. Abdun-Nabi
- ---------------------                           ------------------------
Russell P. Wilson                               Daniel J. Abdun-Nabi
  Assistant Secretary                           Senior Vice President-Legal
                                                Affairs & General Counsel


[Corporate Seal]



                                      - 5 -



 THIS WARRANT AND THE COMMON SHARES ISSUABLE UPON EXERCISE HEREOF HAVE NOT BEEN
      REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR UNDER THE
   SECURITIES LAWS OF ANY STATE OF THE UNITED STATES OR PROVINCE OF CANADA AND
        SUCH SECURITIES MAY NOT BE SOLD, PLEDGED OR OTHERWISE TRANSFERRED
    IN THE ABSENCE OF SUCH REGISTRATION OR AN APPLICABLE EXEMPTION THEREFROM


                          NORTH AMERICAN VACCINE, INC.

                    Warrant for the Purchase of Common Shares
                    -----------------------------------------

No.  W-3                                                          250,000 Shares
     ---

     FOR VALUE  RECEIVED,  NORTH  AMERICAN  VACCINE,  INC.  (the  "Company"),  a
Canadian corporation, hereby certifies that BioChem Pharma Inc. or its permitted
assigns (the "Holder") is entitled to purchase from the Company,  at any time or
from time to time after the date set forth on the signature  page,  but prior to
5:00 p.m. on October 28, 2001, two hundred fifty thousand  (250,000)  fully paid
and non-assessable  common shares, no par value, of the Company for an aggregate
purchase  price of One Million Two Hundred  Eighty-Four  Thousand  Three Hundred
Seventy-Five U.S. Dollars (US$1,284,375) (computed on the basis of US$5.1375 per
share).  (Hereinafter,  (i) said common  shares,  together with any other equity
securities  which may be issued by the  Company in  substitution  therefor,  are
referred  to as  the  "Common  Shares":,  (ii)  the  Common  Shares  purchasable
hereunder are referred to as the "Warrant Shares",  (iii) the aggregate purchase
price payable  hereunder for the Warrant Shares is referred to as the "Aggregate
Warrant Price", (iv) the price payable hereunder for each of the Warrant Shares,
as  adjusted  in the manner set forth in Section 3, is  referred  to as the "Per
Share Warrant Price" and (v) this Warrant and all warrants  hereafter  issued in
exchange or substitution for this Warrant are referred to as the "Warrants") The
Aggregate  Warrant  Price is not subject to  adjustment.  The Per Share  Warrant
Price and the number of Warrant  Shares are subject to adjustment as hereinafter
provided.

     1. EXERCISE OF WARRANT. This Warrant may be exercised, in whole at any time
or in part from time to time  (such  partial  exercises  to be in amounts of not
less  than  1,000  Warrant  Shares),  on and  after  the date  set  forth on the
signature  page,  but prior to 5:00 p.m. on October 28,  2001,  by the Holder of
this Warrant by the surrender of this Warrant (with the subscription form at the
end hereof duly executed) at the principal office of the Company in Columbia, MD
together with proper payment of the Aggregate  Warrant Price  applicable on such
date,  or the  proportionate  part thereof if this Warrant is exercised in part.
Payment for Warrant  Shares  shall be made by (i) check  payable to the order of
the Company,  (ii) wire transfer to an account  designated by and in the name of
the Company, (iii) by delivery to the Company of debt securities for which it is
the issuer and bound to make payment in the stated principal  amount,  where the
principal  amount on such debt security  delivered to the Company for retirement
is equal to the  Aggregate  Warrant  Price;  or (iv) by any  combination  of the
methods set forth in (i) through (iii),  above.  If this Warrant is exercised in
part, this Warrant must be exercised for a number of whole Warrant  Shares,  and
the Holder is entitled to receive a new Warrant  covering  the number of Warrant


                                     - 1 -
<PAGE>


Shares in respect of which this Warrant has not been exercised and setting forth
the proportionate part of the Aggregate Warrant Price applicable to such Warrant
Shares.  Upon  such  surrender  of  this  Warrant,  the  Company  will  issue  a
certificate or  certificates in the name of the Holder for the largest number of
whole Warrant  Shares to which the Holder shall be entitled and, if this Warrant
is  exercised in whole,  in lieu of any  fractional  Warrant  Share to which the
Holder shall be entitled,  cash equal to the fair value of such fractional share
(determined in such  reasonable  manner as the Board of Directors of the Company
shall determine).

     2.  RESERVATION OF WARRANT  SHARES.  The Company agrees that,  prior to the
expiration of this Warrant,  the Company will at all times have  authorized  and
reserve,  and will keep  available,  solely for  issuance or  delivery  upon the
exercise of this Warrant,  the Warrant Shares free and clear of all restrictions
on sale or transfer (except as may arise under  applicable  securities laws) and
free and clear of all preemptive rights.

     3. PROTECTION  AGAINST  DILUTION.  (a) If, at any time or from time to time
after the date of this  Warrant,  the Company  shall (i) issue to the holders of
the Common Shares any Common Shares by way of a stock  dividend;  (ii) subdivide
its outstanding Common Shares into a greater number of shares; (iii) combine its
outstanding number of Common Shares into a smaller number (i.e., a reverse stock
split);  or (iv) issue by  reclassification  of its Common  Shares any shares of
capital stock of the Company then,  and in each such case, the Per Share Warrant
Price in effect  immediately prior to the date of such action shall be adjusted,
or further adjusted, to a price (to the nearest cent) determined by dividing (x)
an amount equal to the number of Common Shares outstanding  immediately prior to
such issuance  multiplied  by the Per Share Warrant Price in effect  immediately
prior to such  issuance  by (y) the total  number of Common  Shares  outstanding
immediately  after such issuance.  Upon each adjustment in the Per Share Warrant
Price  resulting  from a stock  split or stock  dividend,  the number of Warrant
Shares  shall be adjusted by dividing  the  Aggregate  Warrant  Price by the Per
Share Warrant Price in effect immediately after such adjustment.  Notice of each
such  adjustment  and each such  readjustment  shall be forthwith  mailed to the
Holder.

     (b) If the  Company  shall be  consolidated  with or  merged  into  another
corporation,  or shall sell all or substantially  all of its assets as part of a
reorganization  to which  the  Company  is a party  within  the  meaning  of the
Internal Revenue Code of 1986, as presently in effect, or shall issue a security
convertible  into its Common  Shares as a dividend  on its Common  Shares,  each
Warrant  Share shall be replaced for the purposes  hereof by the  securities  or
properties  issuable  or  distributed  in respect of one Common  Share upon such
consolidation,  merger, sale,  reclassification or reorganization,  and adequate
provisions  to that  effect  shall be made at the time  thereof.  Notice of such
consolidation,  merger,  sale,  reclassification or reorganization,  and of said
provisions  so proposed to be made,  shall be mailed to the Holder not less than
15 days prior to such event.

     (c) If the Board of Directors of the Company  shall declare any dividend or
other distribution in cash with respect to the Common Shares,  other than out of
surplus,  the Company  shall mail notice  thereof to the Holder not less than 15


                                     - 2 -
<PAGE>


days prior to the record  date fixed for  determining  shareholders  entitled to
participate in such dividend or other distribution.

     (d) If , during the term of this  Warrant,  the Company shall issue or sell
its Common Shares for a consideration  per share less than the Per Share Warrant
Price  immediately  prior to the time of such issue or sale, then forthwith upon
such issue or sale, the Per Share Warrant Price in effect  immediately  prior to
such issue or sale shall be  reduced to the lower of the prices  (calculated  to
the nearest cent) determined as follows:

          (1) by  dividing  (A) an amount  equal to the sum of (i) the number of
shares of  Common  Stock  outstanding  immediately  prior to such  issue or sale
multiplied  by  the   then-existing  Per  Share  Warrant  Price,  and  (ii)  the
consideration,  if any,  received by the Company upon such issue or sale, by (B)
the total number of Common Shares  outstanding  immediately  after such issue or
sale; and

          (2) by multiplying  the Per Share Warrant Price in effect  immediately
prior to the time of such issue or sale by a fraction,  the  numerator  of which
shall be (A) the sum of (i) the number of Common Shares outstanding  immediately
prior to such issue or sale multiplied by the market price  immediately prior to
such issue or sale; and (ii) the consideration received by the Company upon such
sale, divided by (B) the total number of Common Shares  outstanding  immediately
after such issue or sale, and the denominator of which shall be the market price
immediately prior to such issue or sale.

     4. FULLY PAID  SHARES;  TAXES.  The Company  agrees that the Common  Shares
represented by each and every  certificate  for Warrant Shares  delivered on the
exercise of this Warrant shall, at the time of such delivery,  be validly issued
and outstanding,  fully paid and  non-assessable.  The Company further covenants
and agrees that it will pay, when due and payable, any and all Federal and state
stamp,  original  issue or similar  taxes which may be payable in respect of the
issue of any Warrant Share or certificate therefor.

     5. TRANSFERABILITY.  This Warrant and the Warrant Shares shall not be sold,
transferred,  assigned or  hypothecated  by the Holder except (i) pursuant to an
effective  registration  statement under the Securities Act of 1933, as amended,
and  qualification  for sale  under all other  applicable  state and  provincial
securities rules and regulations  [collectively the "Securities  Acts"]; or (ii)
in full  compliance  with all  requirements  necessary to establish an exemption
from the registration  requirements of the Securities Acts. In order to properly
establish  compliance with (ii), above, the Company shall be entitled to request
and  receive  in  advance  of  authorizing  any sale,  transfer,  assignment  or
hypothecation  of this  Warrant or any of the Warrant  Shares:  (x)  appropriate
transferor and transferee  representation letters supporting a claimed exemption
from registration requirements of the Securities Acts; (y) an opinion of counsel
for the holder of the Warrant and/or Warrant Shares  reasonably  satisfactory to
the Company that the  proposed  transfer  from the holder of the Warrant  and/or
Warrant Shares to the transferee is exempt from the registration requirements of
the  Securities  Act;  and (z) such  other  documentation,  representations  and


                                     - 3 -
<PAGE>


filings as may be reasonably required by counsel in order to issue the foregoing
opinion.  The  Company  may treat the  registered  holder of this  Warrant as it
appears on the Company's books at any time as the Holder for all purposes.

     6. LOSS,  ETC. OF WARRANT.  Upon  receipt of evidence  satisfactory  to the
Company of the loss,  theft,  destruction or mutilation of this Warrant,  and of
indemnity reasonably  satisfactory to the Company, if lost, stolen or destroyed,
and upon  surrender and  cancellation  of this Warrant,  if mutilated,  and upon
reimbursement of the Company's reasonable incidental expenses, the Company shall
execute  and  deliver  to the  Holder a new  Warrant  of like  date,  tenor  and
denomination.

     7. WARRANT HOLDER NOT  SHAREHOLDER.  Except as otherwise  provided  herein,
this  Warrant does not confer upon the Holder any right to vote or to consent or
to receive  notice as a shareholder  of the Company,  as such, in respect of any
matters whatsoever,  or any other rights or liabilities as a shareholder,  prior
to the exercise hereof.

     8. COMMUNICATION. No notice or other communication under this Warrant shall
be effective unless,  but any notice or other  communication  shall be effective
and shall be deemed to have been given if, the same is in writing  and is mailed
by first-class mail, postage prepaid, addressed to:

     (a) the Company at North American  Vaccine,  Inc., 10150 Old Columbia Road,
Columbia, MD 21046 Attention:  Vice President-Finance,  or such other address as
the Company has designated in writing to the Holder, or

     (b) the Holder at BioChem  Pharma  Inc.,  275  Armand  Frappier  Boulevard,
Laval, H7V 4A7 Quebec, Canada Attention:  Executive Vice President-Investments &
Subsidiaries,  or such other address as the Holder has  designated in writing to
the Company.

     9. HEADINGS. The headings of this Warrant have been inserted as a matter of
convenience and shall not affect the construction hereof.

     10.  APPLICABLE  LAW.  This Warrant  shall be governed by and  construed in
accordance with the laws of the State of New York.


                                     - 4 -
<PAGE>


     IN WITNESS WHEREOF, NORTH AMERICAN VACCINE, INC. has caused this Warrant to
be signed by its Vice  President-Finance  and its corporate  seal to be hereunto
affixed and attested by its Assistant Secretary this 28th day of October, 1999.

ATTEST:                                     NORTH AMERICAN VACCINE, INC.



/s/ Russell P. Wilson                       By: /s/ Lawrence J. Hineline
- ---------------------                           ------------------------
Russell P. Wilson                               Lawrence J. Hineline
  Assistant Secretary                           Vice President-Finance


[Corporate Seal]

                                      - 5 -


November 1, 1999


North American Vaccine, Inc.
10150 Old Columbia Road
Columbia, Maryland  21046
Attention:   Dr. Randal Chase
             Chief Executive Officer and President


     Re:   Revolving Credit Facility
           -------------------------

Ladies/Gentlemen:

BANK OF AMERICA,  N.A. ("LENDER") is pleased to make available to NORTH AMERICAN
VACCINE, INC., a Canadian corporation ("BORROWER"),  a revolving credit facility
on the terms and subject to the  conditions  set forth below.  Terms not defined
herein have the meanings assigned to them in EXHIBIT A hereto.

1. THE FACILITY.

   (a)   THE  COMMITMENT.  Subject to the terms and conditions set forth herein,
         Lender agrees to make  available to Borrower  until the Maturity Date a
         revolving line of credit  providing for loans ("LOANS") in an aggregate
         principal  amount  not  exceeding  at  any  time   US$30,000,000   (the
         "COMMITMENT");  PROVIDED,  HOWEVER,  Lender  shall not be  obligated to
         advance Loans in an aggregate  principal  amount  exceeding  $5,000,000
         until  such time as Lender  (I) shall have  received  written  evidence
         satisfactory  to Lender of the  approval  of the finance  committee  of
         Guarantor to permit Loans in an aggregate amount  exceeding  $5,000,000
         (but in no event  greater  than the  Commitment),  (II) shall have been
         granted a first priority  security interest in the collateral set forth
         in SCHEDULE 3(K) attached hereto and (III) shall otherwise  comply with
         the terms and conditions set forth in PARAGRAPH 2(B) hereof. Subject to
         the foregoing  limits,  Borrower may borrow,  repay and reborrow  Loans
         until the Maturity Date.

   (b)   BORROWINGS, CONVERSIONS, CONTINUATIONS. Borrower may request that Loans
         be (i) made as or converted to Base Rate Loans by irrevocable notice to
         be received by Lender not later than 11 a.m. on the Business Day of the
         borrowing or conversion, or (ii) made or continued as, or converted to,

<PAGE>

         Offshore Rate Loans by irrevocable  notice to be received by Lender not
         later than 11 a.m. three Business Days prior to the Business Day of the
         borrowing,  continuation  or  conversion.  If Borrower  fails to give a
         notice of conversion or  continuation  prior to the end of any Interest
         Period in respect of any Offshore Rate Loan,  Borrower  shall be deemed
         to have  requested  that such Loan be  converted to a Base Rate Loan on
         the last day of the applicable Interest Period.

         Each  Offshore  Rate  Loan  shall be in a minimum  principal  amount of
         $1,000,000 or a multiple of $500,000 in excess thereof.  Each Base Rate
         Loan shall be in a minimum  principal  amount of $500,000 or a multiple
         of  $100,000 in excess  thereof.  There shall not be more than five (5)
         different Interest Periods in effect at any time.  Notwithstanding  the
         foregoing, except for the initial Loan, Borrower shall not be permitted
         to  borrow  Loans  in  an  aggregate  principal  amount  in  excess  of
         $2,500,000 during any consecutive fourteen (14) day period (measured on
         a rolling  fourteen (14) day basis) (unless  otherwise  consented to in
         writing by Guarantor)  and only for the purposes set forth in PARAGRAPH
         3(F) hereof.

   (c)   INTEREST.  At the option of  Borrower,  Loans shall bear  interest at a
         rate per annum equal to (i) the Offshore  Rate PLUS .625%;  or (ii) the
         Base Rate. Interest on Base Rate Loans when the Base Rate is determined
         by Lender's  prime rate shall be  calculated  on the basis of a year of
         365 or 366 days and actual days elapsed.  All other interest  hereunder
         shall be  calculated on the basis of a year of 360 days and actual days
         elapsed.

         Borrower  promises to pay interest (i) for each  Offshore Rate Loan, on
         the last day of the applicable  Interest  Period,  and, if the Interest
         Period is longer  than one  month,  on the  respective  dates that fall
         every month after the beginning of the Interest  Period;  (ii) for Base
         Rate Loans, on the last Business Day of each calendar month;  and (iii)
         for all Loans,  on the  Maturity  Date.  If the time for any payment is
         extended by operation of law or otherwise,  interest  shall continue to
         accrue for such extended period.

         After  the date any  principal  amount  of any Loan is due and  payable
         (whether on the maturity date,  upon  acceleration  or  otherwise),  or
         after any other monetary obligation hereunder shall have become due and
         payable,  Borrower shall pay, but only to the extent  permitted by law,
         interest  (after as well as before  judgment) on such amounts at a rate
         per  annum  equal to the Base  Rate  plus 2%.  Such  interest  shall be
         payable on demand.

         In no case shall interest  hereunder  exceed the amount that Lender may
         charge or collect under applicable law.



                                      -2-
<PAGE>

   (d)   EVIDENCE  OF  LOANS.  The  Loans  and all  payments  thereon  shall  be
         evidenced by Lender's  loan  accounts and records;  PROVIDED,  HOWEVER,
         that upon the request of Lender,  the Loans may be  evidenced by a grid
         promissory  note in the form of  EXHIBIT  B  hereto,  instead  of or in
         addition to such loan accounts and records. Such loan accounts, records
         and promissory  note shall be conclusive  absent  manifest error of the
         amount of the Loans and  payments  thereon.  Any  failure to record any
         Loan or  payment  thereon  or any  error in doing so shall not limit or
         otherwise  affect the  obligation  of Borrower to pay any amount  owing
         with respect to the Loans.

   (e)   FEES.  Borrower  promises to pay the following fees in accordance  with
         the terms hereof:

         (i)  STRUCTURING  FEE.   Borrower  shall  pay  to  Lender  a  fee  (the
         "STRUCTURING  FEE") in accordance with the terms and conditions of that
         certain letter  agreement  dated as of November 1, 1999 among Borrower,
         Guarantor and Lender.  The  Structuring Fee shall be due and payable to
         Lender upon the execution  and delivery of this  Agreement and shall be
         non-refundable once paid.

         (ii) COMMITMENT FEE. Borrower shall pay to Lender a commitment fee (the
         "COMMITMENT  FEE") of .25% per annum on the daily unused portion of the
         Commitment,  payable  in  arrears  on the  last  Business  Day of  each
         calendar month and on the Maturity Date, and calculated on the basis on
         a year of 360 days and actual  days  elapsed;  provided  that  Borrower
         shall not be  obligated to pay the  Commitment  Fee with respect to the
         portion of the Commitment that is not available (in accordance with the
         terms of PARAGRAPH 1(A) hereof) for borrowing by Borrower.

   (f)   REPAYMENT.  Borrower  promises to pay all Loans then outstanding on the
         Maturity Date, unless earlier  accelerated in accordance with the terms
         of this Agreement.

         Borrower  shall make all payments  required  hereunder not later than 1
         p.m. on the date of payment in same day funds in United States  Dollars
         at the office of Lender  located at 100 North Tryon Street,  Charlotte,
         North  Carolina  28255 or such other address as Lender may from time to
         time designate in writing.


                                      -3-
<PAGE>

         All payments by Borrower to Lender hereunder shall be made to Lender in
         full without set-off or  counterclaim  and free and clear of and exempt
         from, and without  deduction or  withholding  for or on account of, any
         present  or  future  taxes,  levies,  imposts,  duties  or  charges  of
         whatsoever   nature   imposed  by  any   government  or  any  political
         subdivision or taxing authority  thereof.  If any taxes are required to
         be withheld or deducted from any amount payable under this Agreement or
         the Note (if any), then the amount payable under this Agreement or such
         Note shall be increased to the amount which,  after deduction from such
         increased  amount of all taxes  required  to be  withheld  or  deducted
         therefrom,  will yield to Lender the amount  stated to be payable under
         this Agreement or such Note.  Borrower shall  reimburse  Lender for any
         taxes  imposed on or  withheld  from such  payments  and paid by Lender
         (other  than taxes  imposed on Lender's  income,  and  franchise  taxes
         imposed on Lender,  by the jurisdiction  under the laws of which Lender
         is organized or any  political  subdivision  thereof) not later than 10
         days after written demand by Lender,  and Borrower shall be responsible
         for  any  interest,  penalties  and  expenses  incurred  by  Lender  in
         connection with the collection of such amounts.

   (g)   PREPAYMENTS.  Borrower may, upon three  Business  Days' notice,  in the
         case of Offshore Rate Loans,  and upon  same-day  notice in the case of
         Base Rate  Loans,  prepay  Loans on any  Business  Day;  PROVIDED  that
         Borrower  pays  all  Breakage  Costs  (if  any)  associated  with  such
         prepayment on the date of such prepayment. Prepayments of Offshore Rate
         Loans must be  accompanied  by a payment of  interest  on the amount so
         prepaid. Prepayments must be in a principal amount of at least $500,000
         or a multiple of $100,000 in excess thereof.

   (h)   COMMITMENT  REDUCTIONS.  Borrower may, upon five Business Days' notice,
         reduce or cancel the undrawn portion of the Commitment,  PROVIDED, that
         the  amount  of such  reduction  is not less than  $500,000  or a whole
         multiple thereof.

2. (a)   CONDITIONS  PRECEDENT TO INITIAL LOAN. As a condition  precedent to the
         initial   Loan   hereunder   (which  such   amount   shall  not  exceed
         US$5,000,000),  Lender must receive the following  from or on behalf of
         Borrower and/or Guarantor in form  satisfactory to Lender and Guarantor
         (provided that with respect to items  delivered by Guarantor to Lender,
         such items need only be satisfactory to Lender in its discretion):

         (i)   the  enclosed  duplicate  of this  Agreement  duly  executed  and
               delivered on behalf of Borrower;

         (ii)  (A) the Security  Agreement and the IP Security  Agreement,  each

               duly  executed and  delivered on behalf of Borrower to Lender and
               (I) UCC  financing  statements  executed on behalf of Borrower to


                                      -4-
<PAGE>


               Lender for each  appropriate  jurisdiction  as is  necessary,  in
               Lender's  and  Guarantor's  discretion,  to perfect its  security
               interest     in    such     collateral     and/or    (II)    such
               patent/trademark/copyright filings executed on behalf of Borrower
               to be made with the United States Patent and Trademark  Office as
               requested  by  Lender  in  order  to  perfect  Lender's  security
               interest  in such  collateral  and (B) a security  agreement  and
               intellectual  property security  agreement executed and delivered
               on behalf of Borrower to Guarantor in consideration of Borrower's
               obligations  under  the  Reimbursement   Agreement  and  (I)  UCC
               financing  statements executed on behalf of Borrower to Guarantor
               for each appropriate jurisdiction as is necessary, in Guarantor's
               discretion,  to perfect its security  interest in such collateral
               and/or (II) such  patent/trademark/copyright  filings executed on
               behalf of Borrower to be made with the United  States  Patent and
               Trademark  Office as  requested  by Guarantor in order to perfect
               Guarantor's security interest in such collateral;

         (iii) legal documentation deemed necessary or appropriate by Lender and
               Guarantor under Canadian law to pledge  Borrower's  interest with
               respect to the collateral described in the Security Agreement and
               the IP Security Agreement;

         (iv)  the Guaranty duly executed and delivered on behalf of Guarantor;

         (v)   the Reimbursement Agreement duly executed and delivered on behalf
               of Borrower;

         (vi)  a  favorable  legal  opinion of (A) U.S.  counsel(s)  to Borrower
               acceptable to Lender and Guarantor regarding, but not limited to,
               the due authorization,  execution, delivery and enforceability of
               this  Agreement  and the  perfection  of the  security  interests
               granted to Lender by the Security  Agreement  and the IP Security
               Agreement  and (B)  Canadian  counsel to Borrower  acceptable  to
               Lender  and  Guarantor  regarding,  but not  limited  to, the due
               authorization,  execution,  delivery  and  enforceability  of the
               Canadian collateral  documents and the perfection of the security
               interests granted thereunder;

         (vii) the execution and delivery of that certain letter agreement dated
               as of November 1, 1999 among  Borrower,  Guarantor and Lender and
               the payment of the fees referenced therein;


                                      -5-
<PAGE>

         (viii) the  execution  and  delivery of that certain  letter  agreement
                between Borrower and Guarantor regarding the payment by Borrower
                of certain break-up fees;

         (ix)   a copy of (A) the articles of  incorporation  (or other  charter
                documents)  and bylaws of Borrower  certified  by a secretary or
                assistant secretary of Borrower to be true and correct as of the
                Closing  Date and (B) the  articles of  incorporation  (or other
                charter  documents)  and  bylaws  of  Guarantor  certified  by a
                secretary  or  assistant  secretary  of Guarantor to be true and
                correct as of the Closing Date;

         (x)    a certified borrowing resolution or other evidence of Borrower's
                authority to borrow hereunder;

         (xi)   a certified resolution or other evidence of Guarantor's\
                authority to deliver the Guaranty;

         (xii)  a certificate of incumbency for each of Borrower and Guarantor;

         (xiii) a certificate of good standing, existence or its equivalent with
                respect to each of  Borrower  and  Guarantor  certified  as of a
                recent date by the appropriate  governmental  authorities of the
                state or other  jurisdiction  of  incorporation  and each  other
                jurisdiction  in which the  failure to so qualify and be in good
                standing would have a Material Adverse Effect;

         (xiv)  if requested by Lender,  a promissory  note as  contemplated  in
                PARAGRAPH 1(D) above;

         (xv)   receipt of (A) audited consolidated balance sheet and statements
                of earnings and cash flow of Borrower and its Subsidiaries as of
                December 31, 1998 and (B) unaudited  consolidated  balance sheet
                and  statements  of earnings  and cash flow of Borrower  and its
                Subsidiaries  for the fiscal  quarters ending March 31, 1999 and
                June 30, 1999, respectively;

         (xvi)  receipt   of   copies   of   (A) the Royal Bank of Canada Credit
                Facility  certified  by an officer of  Borrower to be a true and
                accurate  copy and (B) each other  credit  agreement of Borrower
                and/or its Subsidiaries evidencing liabilities, in each case, of
                Borrower and/or its Subsidiaries in excess of $1,000,000; and


                                      -6-
<PAGE>

         (xvii) such other  documents  as Lender  or  Guarantor  may  reasonably
                request.

   (b)   CONDITIONS  PRECEDENT TO SECOND BORROWING.  As a condition precedent to
         the second  borrowing under this Agreement (which such second borrowing
         shall not exceed U.S.  $25,000,000  and together  with the initial Loan
         shall not  exceed  in the  aggregate  U.S.  $30,000,000),  Lender  must
         receive the following from or on behalf of Borrower and/or Guarantor in
         form  satisfactory to Lender and Guarantor  (provided that with respect
         to items  delivered  by  Guarantor  to Lender,  such items need only be
         satisfactory to Lender in its discretion):

         (i)   written  evidence  satisfactory  to Lender of the approval of the
               finance  committee  of  Guarantor to permit Loans in an aggregate
               amount exceeding $5,000,000;

         (ii)  (A)  Borrower  shall  have  granted  to  Lender a first  priority
               security interest in additional  unencumbered collateral existing
               at such time  which is  reasonably  satisfactory  to  Lender  and
               Guarantor and Borrower  shall have executed and delivered (I) all
               necessary  documents  to  be  filed  with  the  U.S.  Patent  and
               Trademark Office and other appropriate  filing locations and (II)
               all UCC financing statements for each appropriate jurisdiction as
               deemed  necessary  by  Lender  and  Guarantor,  in  Lender's  and
               Guarantor's discretion, to Lender or its designee for filing with
               the  appropriate  offices and (B) Borrower  shall have granted to
               Guarantor  a  security  interest  in  the  additional  collateral
               referred  to in  subsection  (A) above and  Borrower  shall  have
               executed and delivered  (I) all  necessary  documents to be filed
               with the U.S. Patent and Trademark  Office and other  appropriate
               filing  locations and (II) all UCC financing  statements for each
               appropriate  jurisdiction  as  deemed  necessary  by  Lender  and
               Guarantor, in Lender's and Guarantor's  discretion,  to Guarantor
               or its designee for filing with the appropriate offices; and

         (iii) a legal opinion of  counsel(s)  to Borrower  acceptable to Lender
               and   Guarantor   regarding,   but  not   limited   to,  the  due
               authorization,  execution,  delivery and  enforceability  of such
               documents related to the additional collateral;

         (iv)  an   officer's   certificate   of  Borrower   stating   that  all
               representations  and warranties set forth in PARAGRAPH 3 continue
               to be true and correct in all material respects as of the date of
               such borrowing and that no Default or Event of Default shall have
               occurred and be continuing on the date of such borrowing;


                                      -7-
<PAGE>

         (v)   the North American Vaccine Acquisition  Agreement shall have been
               executed and delivered on or before November 16, 1999;

         (vi)  no Material  Adverse Change shall have occurred since the Closing
               Date; and

         (vii) such other documents,  filings or opinions as Lender or Guarantor
               may reasonably request.

   (c)   CONDITIONS  TO  EACH  BORROWING,  CONTINUATION  AND  CONVERSION.  As  a
         condition   precedent  to  each   borrowing   (including   the  initial
         borrowing), conversion and continuation of any Loan:

         (i)   Borrower must furnish Lender and Guarantor  with, as appropriate,
               a notice of borrowing, conversion or continuation;

         (ii)  each  representation  and warranty set forth in PARAGRAPH 3 below
               shall be true and correct in all material  respects as if made on
               the date of such borrowing, continuation or conversion; and

         (iii) no  Default  or Event  of  Default  shall  have  occurred  and be
               continuing  on  the  date  of  such  borrowing,  continuation  or
               conversion.

               Each notice of borrowing and notice of conversion or continuation
               shall be deemed a  representation  and warranty by Borrower  that
               the  conditions  referred to in clauses (ii) and (iii) above have
               been met.

3.  REPRESENTATIONS  AND  WARRANTIES.  Borrower  represents  and warrants to the
    Lender that:

    (a)  EXISTENCE  AND  QUALIFICATION;  POWER;  COMPLIANCE  WITH LAWS.  It is a
         corporation  duly  organized  or formed,  validly  existing and in good
         standing under the laws of Canada,  has the power and authority and the
         legal right to own and operate its properties,  to lease the properties
         it operates and to conduct its business,  is duly qualified and in good
         standing under the laws of each jurisdiction where its ownership, lease
         or operation of properties or the conduct of its business requires such
         qualification,  and is in compliance with all laws except to the extent
         that noncompliance does not have a Material Adverse Effect.

    (b)  POWER; AUTHORIZATION;  ENFORCEABLE OBLIGATIONS. The execution, delivery
         and  performance  of this  Agreement  and the other Loan  Documents  by
         Borrower  are within its  powers and have been duly  authorized  by all

                                      -8-
<PAGE>

         necessary  action,  and this Agreement is and the other Loan Documents,
         when  executed,  will be,  legal,  valid  and  binding  obligations  of
         Borrower, enforceable in accordance with their respective terms, except
         as the  enforceability  thereof  may be  limited by  applicable  Debtor
         Relief Laws and general principles of equity.  The execution,  delivery
         and  performance of this Agreement and the other Loan Documents are not
         in contravention of law or of the terms of Borrower's organic documents
         and will not result in the breach of or constitute a default under,  or
         result in the  creation  of a lien under any  indenture,  agreement  or
         undertaking to which Borrower is a party or by which it or its property
         may be bound or affected.

(c)      FINANCIAL  STATEMENTS;  NO  MATERIAL  ADVERSE  EFFECT.  (I) The audited
         consolidated  balance sheet and statements of earnings and cash flow of
         Borrower and its  Subsidiaries for the fiscal year ended as of December
         31,  1998 have  heretofore  been  furnished  to Lender  and filed  with
         Borrower's  Form 10-K for the fiscal  year then  ended.  The  unaudited
         consolidated  balance  sheet and  statements of earnings and cash flows
         for the  fiscal  quarters  ending  March  31,  1999 and June 30,  1999,
         respectively,  have  heretofore been furnished to Lender and filed with
         Borrower's  Form 10-Q for such quarters.  The financial  statements for
         Borrower's   fiscal  quarter  ending  June  30,  1999   (excluding  any
         amendments,  restatements or subsequent  filings with respect  thereto)
         present fairly the consolidated financial condition of Borrower and its
         Subsidiaries  as of June 30,  1999,  and since June 30,  1999 there has
         been no  event or  circumstance  that has a  Material  Adverse  Effect,
         except as has been  publicly  disclosed  by Borrower  prior to the date
         hereof or except as set forth in Schedule  3(c).  All of the  foregoing
         historical  financial  statements have been prepared in accordance with
         generally accepted accounting principles consistently applied except as
         disclosed in the notes thereto.

         (II) On and as of the Closing Date,  the  Projections  delivered to the
         Lender  have been  prepared  in good faith and are based on  reasonable
         assumptions,  and there are no statements,  calculations or conclusions
         in the Projections which are based upon or include information known to
         Borrower to be misleading in any material respect or which fail to take
         into  account  material  information  known to Borrower  regarding  the
         matters reported therein.  On the Closing Date,  Borrower believes that
         the Projections are reasonable.

    (d)  NO MATERIAL LITIGATION. Except as set forth in SCHEDULE 3(D) hereof, no
         litigation  or  governmental  proceeding  is  pending  or,  to the best
         knowledge of Borrower,  threatened  by or against  Borrower  which,  if
         adversely determined, has a Material Adverse Effect.

    (e)  NO  DEFAULT.  No  Default  or  Event of  Default  has  occurred  and is
         continuing.


                                      -9-
<PAGE>

    (f)  USE OF  PROCEEDS.  The  proceeds  of the Loans will be used  solely for
         working  capital  purposes of Borrower  (and in any event in accordance
         with the restrictions set forth in Section 4(c) hereof) and not for any
         other purposes except as set forth in SCHEDULE 3(F) hereto.

    (g)  ERISA.  Each Plan is in  compliance  in all material  respects with the
         applicable  provisions of ERISA,  the Code,  and other Federal or state
         law,  including  all  requirements  under the Code or ERISA for  filing
         reports,  and benefits have been paid in accordance with the provisions
         of such  Plan  except  where the  failure  to be in  compliance  in all
         material respects does not have a Material Adverse Effect.

    (h)  ENVIRONMENTAL  MATTERS.  All facilities  owned or leased by Borrower or
         its  Subsidiaries  have been and continue to be in material  compliance
         with all material environmental laws and regulations.

    (i)  YEAR 2000.  Borrower has (i)  initiated a review and  assessment of all
         areas within its and each of its Subsidiaries'  business and operations
         (including  those  affected by  customers  and  vendors)  that could be
         adversely  affected by the "Year 2000 Problem"  (that is, the risk that
         computer  applications and devices  containing  imbedded computer chips
         used  by  Borrower  or any of its  Subsidiaries  (or  their  respective
         customers and vendors) may be unable to recognize and perform  properly
         date-sensitive  functions involving certain dates prior to and any date
         after  December  31,  1999),  (ii)  developed a plan and  timeline  for
         addressing the Year 2000 Problem on a timely basis,  and (iii) to date,
         implemented  that plan in accordance with that timetable.  Based on the
         foregoing, Borrower believes that all computer applications and devices
         containing  imbedded  computer  chips  (including  those of its and its
         Subsidiaries' customers and vendors) that are material to its or any of
         its Subsidiaries'  business and operations are reasonably expected on a
         timely basis to be able to perform  properly  date-sensitive  functions
         for all dates before and after  January 1, 2000 (that is, be "Year 2000
         compliant"), except to the extent that a failure to do so does not have
         a Material Adverse Effect.

    (j)  FULL  DISCLOSURE.  No written  statement  made by Borrower to Lender in
         connection  with  this  Agreement,  or in  connection  with  any  Loan,
         contains any untrue  statement  of a material  fact or omits a material
         fact necessary to make the statement made not misleading.

    (k)  INTELLECTUAL  PROPERTY.  Borrower  owns, or has the legal right to use,
         all  trademarks,   tradenames,  copyrights,  technology,  know-how  and
         processes (the "INTELLECTUAL PROPERTY") necessary for it to conduct its
         business as currently conducted,  except for such Intellectual Property
         for which the  failure to own or have the legal  right to use could not

                                      -10-
<PAGE>

         have a Material Adverse Effect. Set forth on SCHEDULE 3(K) is a list of
         all  Intellectual  Property  that Borrower is pledging as collateral on
         the Closing  Date.  Except as provided on SCHEDULE  3(K),  no claim has
         been asserted and is pending by any Person  challenging  or questioning
         the  use  of  any  such  Intellectual   Property  or  the  validity  or
         effectiveness of any such Intellectual Property, nor does Borrower have
         knowledge of any such claim, and the use of such Intellectual  Property
         by Borrower  does not infringe on the rights of any Person,  except for
         such claims and infringements that, in the aggregate,  could not have a
         Material Adverse Effect.

    (l)  NO OTHER LIENS.  Other than as disclosed in SCHEDULE  3(K) or otherwise
    disclosed  in  writing  to  Lender  and  Guarantor,   with  respect  to  the
    "Collateral"  (as defined in the Security  Agreement) and the  "Intellectual
    Property Collateral" (as defined in the IP Security Agreement), Borrower has
    not assigned rights of payment in or otherwise  granted a security  interest
    with respect to such rights or collateral to any other Person.

4.  COVENANTS. So   long   as  principal   of   and  interest on any Loan or any
    other  amount  payable  hereunder or under any other Loan  Document  remains
    unpaid or unsatisfied and the Commitment has not been terminated:

    (a)  INFORMATION.  Borrower shall deliver to Lender:

         (i)   (A) as  soon   as  available  and  in any  event  within  90 days
               after the end of each  fiscal  year of  Borrower  a  consolidated
               balance sheet of Borrower and its  Subsidiaries  as of the end of
               such  fiscal  year and the  related  consolidated  statements  of
               income and cash flows for such fiscal year, setting forth in each
               case in  comparative  form the  figures for the  previous  fiscal
               year,  all  prepared  in  accordance   with  generally   accepted
               accounting principles applied on a consistent basis and certified
               by  independent  public  accountants  of  nationally   recognized
               standing and (B) as soon as available  and in any event within 30
               days after the end of each fiscal year of Borrower a  preliminary
               consolidated balance sheet of Borrower and its Subsidiaries as of
               the  end  of  such  fiscal  year  and  the  related   preliminary
               consolidated  statements of income and cash flows for such fiscal
               year,  setting forth in each case in comparative form figures for
               (I) Borrower's previous fiscal year and (II) the projected budget
               for the fiscal year then ended, all in reasonable detail and duly
               certified  (subject to normal year-end  adjustments) by the chief
               financial   officer  of  Borrower  as  having  been  prepared  in
               accordance with generally accepted accounting  principles applied
               on a  consistent  basis,  and,  in  addition  to the  preliminary
               statements  required  to be  delivered  pursuant  to  (B)  above,
               Borrower shall provide to Lender any changes or

                                      -11-
<PAGE>

               modifications (if any) to such preliminary  financial  statements
               every two weeks  after the initial  delivery of such  preliminary
               statements;

         (ii)  (A) as  soon   as   available  and in any  event  within  30 days
               after the end of each of the first three  quarters of each fiscal
               year of Borrower,  a  consolidated  balance sheet of Borrower and
               its  Subsidiaries  as of the end of such  quarter and the related
               consolidated statements of income and cash flows for such quarter
               and for the portion of Borrower's fiscal year ended at the end of
               such quarter,  setting forth in each case in comparative form the
               figures  for the  corresponding  quarter  and  the  corresponding
               portion of  Borrower's  previous  fiscal year,  all in reasonable
               detail   and  duly   certified   (subject   to  normal   year-end
               adjustments) by the chief financial officer of Borrower as having
               been prepared in accordance  with generally  accepted  accounting
               principles  applied  on a  consistent  basis  and  (B) as soon as
               available  and in any event  within 15 days after the end of each
               of the  first  three  fiscal  quarters  of  each  fiscal  year of
               Borrower a preliminary consolidated balance sheet of Borrower and
               its  Subsidiaries  as of the  end of  such  quarter  and  related
               preliminary  consolidated  statements of income and cash flow for
               such quarter then ended;

         (iii) as soon as  available   and   in  any event  within 20 days after
               the end of each  month  (except  the  final  month of its  fiscal
               year),  a copy of the  unaudited  consolidated  balance  sheet of
               Borrower  and  its  Subsidiaries  and  the  related  consolidated
               statements of income and cash flows for such month, setting forth
               in  each  case  in  comparative  form  the  figures  for  (A) the
               corresponding  month of Borrower's  previous  fiscal year and (B)
               the projected  budget for the month then ended, all in reasonable
               detail   and  duly   certified   (subject   to  normal   year-end
               adjustments) by the chief financial officer of Borrower as having
               been prepared in accordance  with generally  accepted  accounting
               principles applied on a consistent basis;

         (iv)  within  20  days  after  the  end of each month (except the final
               month of its fiscal year), a certificate of Borrower certified by
               the chief  financial  officer  of  Borrower  that (A) each of the
               representations  and  warranties  set forth in PARAGRAPH 3 hereof
               are true and  accurate as of the end of such fiscal month and (B)
               no  Default  or Event  of  Default  shall  have  occurred  and be
               continuing as of the end of such fiscal month;

         (v)   promptly  upon  transmission  or receipt  thereof,  (A)  complete
               copies  of  any  filings  and  registrations  with,  and  reports
               (special or otherwise) to or from, the Securities and

                                      -12-
<PAGE>

               Exchange   Commission   or  any  successor   agency,   (B)  proxy
               statements,  notices  and  reports  that  Borrower  sends  to its
               shareholders  and (C)  copies  of all  press  releases  issued by
               Borrower;

         (v)   promptly upon  Borrower's  obtaining  knowledge of any Default or
               Event of Default, a certificate of the chief financial officer of
               Borrower  setting  forth the details  thereof and any action that
               Borrower is taking or proposes to take with respect thereto; and

         (vi)  from  time to time  such  additional  information  regarding  the
               financial  condition or business of Borrower and its Subsidiaries
               as Lender may reasonably request.

         (b)  OTHER AFFIRMATIVE COVENANTS.  Borrower shall, and shall cause each
              of its Subsidiaries to:

              (i)  preserve  and  maintain  all of its rights,  privileges,  and
                   franchises  necessary or  desirable in the normal  conduct of
                   its business;

              (ii) comply with the requirements of all applicable  laws,  rules,
                   regulations,  and  orders  of  governmental  authorities  the
                   violation of which could result in a Material Adverse Effect;

             (iii) pay and  discharge  when  due  all  taxes,  assessments,  and
                   governmental charges or levies imposed on it or on its income
                   or profits or any of its  property,  except for any such tax,
                   assessment,  charge,  or levy the  payment  of which is being
                   contested in good faith and by proper proceedings and against
                   which adequate reserves are being maintained;

              (iv) maintain all of its properties  owned or used in its business
                   in good working  order and  condition  ordinary wear and tear
                   excepted;

              (v)  permit  representatives  of Lender,  during  normal  business
                   hours and upon reasonable notice, to examine,  copy, and make
                   extracts   from  its  books  and  records,   to  inspect  its
                   properties,  and to discuss its business and affairs with its
                   officers, directors, and accountants;

              (vi) cause  (A) all of its  Intellectual  Property  set  forth  on
                   SCHEDULE  3(K)  and  (B)  all of its  receivables  and  other
                   collateral subject to the Security Agreement to be subject at
                   all  times to  first  priority,  perfected  Liens in favor of
                   Lender  to  secure  the  obligations   under  this  Agreement
                   pursuant  to the  terms  and  conditions  of the IP  Security

                                      -13-
<PAGE>

                   Agreement and the Security Agreement. Borrower shall promptly
                   notify Lender of the acquisition of any Intellectual Property
                   subsequent to the Closing Date; and

             (vii) maintain  insurance in such amounts,  with such  deductibles,
                   and against such risks as is customary for similarly situated
                   businesses.

         (c)   NEGATIVE  COVENANTS.  Borrower shall not, nor shall it permit any
               of its Subsidiaries to:

               (i)  INDEBTEDNESS.  Create,  incur, assume or suffer to exist any
                    Indebtedness,   EXCEPT:  (A)  Indebtedness  under  the  Loan
                    Documents  and  (B)  Indebtedness  outstanding  on the  date
                    hereof and listed on SCHEDULE  4(C)(I);  provided  that from
                    and  after  the date of this  Agreement,  in no event  shall
                    Borrower  or its  Subsidiaries  be  permitted  to  make  any
                    additional  borrowings under the Royal Bank of Canada Credit
                    Facility (not to include  conversions  or  continuations  of
                    existing borrowed amounts).

               (ii) LIENS  AND  NEGATIVE  PLEDGES.  Incur,  assume  or suffer to
                    exist, any Lien or Negative Pledge upon any of its property,
                    assets or revenues, whether now owned or hereafter acquired,
                    EXCEPT  Liens  and  Negative  Pledges  existing  on the date
                    hereof and listed on SCHEDULE 4(C)(II).

              (iii) FUNDAMENTAL CHANGES.  Except as provided for or contemplated
                    under the North America Vaccine Acquisition Agreement, merge
                    or  consolidate  with or into any  Person or enter  into any
                    other  agreement  contemplating a merger,  consolidation  or
                    disposition of all or  substantially  all of its assets with
                    any other Person  (other than  Guarantor or any Affiliate of
                    Guarantor)  or  liquidate,  wind-up or dissolve  itself,  or
                    permit or suffer any  liquidation  or dissolution or use the
                    proceeds  of any  Loan in  connection  with  any  merger  or
                    acquisition of assets.


               (iv) DISPOSITIONS.   Make  any   Dispositions,   other   than (A)
                    Dispositions of inventory and (B) other than Dispositions in
                    the ordinary  course of  Borrower's  business and in amounts
                    not to exceed $25,000 for any single Disposition.

               (v)  INVESTMENTS. Make any Investments.

               (vi) LEASE OBLIGATIONS. Create or suffer to exist any obligations
                    for the  payment  of rent for any  property  under  lease or
                    agreement to lease,  EXCEPT  leases in existence on the date
                    hereof and any  renewal,  extension or  refinancing  thereof

                                      -14-
<PAGE>

                    provided  that the rental  payments or financed  amount with
                    respect to such lease does not increase.

              (vii) RESTRICTED   PAYMENTS.   Make  any  Restricted  Payments  or
                    otherwise prepay any obligations or liabilities  (whether in
                    the ordinary course or otherwise).

             (viii) ERISA. At  any  time engage in a transaction  which could be
                    subject to Sections 4069 or 4212(c) of ERISA,  or permit any
                    Pension  Plan to (a)  engage in any  non-exempt  "prohibited
                    transaction"  (as defined in Section 4975 of the Code);  (b)
                    fail to comply with ERISA or any other  applicable  Laws; or
                    (c) incur any material  "accumulated funding deficiency" (as
                    defined in Section  302 of ERISA),  which,  with  respect to
                    each event listed above, has a Material Adverse Effect.

               (ix) CHANGE IN NATURE OF BUSINESS.  Make any change in the nature
                    of the business of Borrower or its Subsidiaries as conducted
                    and as proposed to be conducted as of the date hereof.

               (x)  TRANSACTIONS WITH AFFILIATES.  Enter into any transaction of
                    any  kind  with  any   Affiliate  of  Borrower   other  than
                    arm's-length transactions with Affiliates that are otherwise
                    permitted hereunder.

               (xi) CAPITAL EXPENDITURES.  Except as set forth in SCHEDULE  3(f)
                    hereto,  mmake,  or become  legally  obligated to make,  any
                    capital  expenditure  in excess of $100,000 from the Closing
                    Date to and including the Maturity Date.

              (xii) CHANGE IN AUDITORS.  Change the certified public accountants
                    auditing  the  books of  Borrower  without  the  consent  of
                    Lender.

5. EVENTS OF DEFAULT. The following are "EVENTS OF DEFAULT" hereunder:

   (a)  Borrower  fails to pay any principal of any Loan as and on the date when
        due; or

   (b)  Borrower fails to pay any interest on any Loan, or any  commitment  fees
        due hereunder,  or any portion thereof, within three days after the date
        when due; or Borrower  fails to pay any other fees or amount  payable to
        Lender under any Loan Document, or any portion thereof, within five days
        after the date due; or

   (c)  Any default  occurs in the  observance or  performance  of any agreement
        contained in PARAGRAPH 4(a) or 4(c) hereof; or

   (d)  Borrower  fails to perform or observe any other  covenant  or  agreement
        (not specified  above)  contained in any Loan Document on its part to be
        performed or observed and such failure continues for 10 days; or


                                      -15-
<PAGE>

   (e)  Any   representation  or  warranty  in  any  Loan  Document  or  in  any
        certificate,  agreement,  instrument or other document made or delivered
        by Borrower  pursuant to or in connection  with any Loan Document proves
        to have been incorrect when made or deemed made; or

   (f)  Borrower  (i)  defaults  in any  payment  when  due of  principal  of or
        interest on any indebtedness  (other than  indebtedness  hereunder),  or
        (ii) defaults in the observance or performance of any other agreement or
        condition   relating  to  any  indebtedness   (other  than  indebtedness
        hereunder)  or contained  in any  instrument  or  agreement  evidencing,
        securing or relating thereto, or any other event shall occur, the effect
        of which default or other event is to cause,  or to permit the holder or
        holders  of such  indebtedness  (or a trustee or agent on behalf of such
        holder or holders or beneficiary or  beneficiaries)  to cause,  with the
        giving of notice if required, indebtedness having an aggregate principal
        amount in excess of $100,000 to be demanded or become due (automatically
        or otherwise) prior to its stated maturity,  or any guaranty  obligation
        in such  amount to become  payable,  or  Borrower is unable or admits in
        writing its inability to pay its debts as they mature; or

   (g)  Any Loan Document,  at any time after its execution and delivery and for
        any reason other than the agreement of Lender or satisfaction in full of
        all the indebtedness hereunder, ceases to be in full force and effect or
        to give Lender the Liens, rights,  powers and privileges purported to be
        created  thereby,  or any  Loan  Document  is  declared  by a  court  of
        competent  jurisdiction to be null and void, invalid or unenforceable in
        any respect;  or Borrower denies that it has any or further liability or
        obligation under any Loan Document, or purports to revoke,  terminate or
        rescind any Loan Document; or

   (h)  The Guaranty or any  provision  thereof  shall cease to be in full force
        and  effect  or  Guarantor  or any  Person  acting  by or on  behalf  of
        Guarantor  shall deny or  disaffirm  Guarantor's  obligations  under the
        Guaranty, or Guarantor shall otherwise default in the due performance or
        observance  of  any  term,  covenant  or  agreement  on its  part  to be
        performed  or  observed  pursuant  to the  Guaranty,  including  without
        limitation the occurrence of any Guaranty Event of Default; or

   (i)  A final judgment against Borrower is entered for the payment of money in
        excess  of  $100,000  and  such  judgment  remains  unsatisfied  without
        procurement  of a stay of  execution  within 10 calendar  days after the
        date of entry of judgment; or


                                      -16-
<PAGE>

   (j)  Borrower  or any of  its  Subsidiaries  institutes  or  consents  to the
        institution  of any  proceeding  under Debtor  Relief Laws,  or makes an
        assignment  for the benefit of creditors;  or applies for or consents to
        the  appointment  of  any  receiver,  trustee,  custodian,  conservator,
        liquidator,  rehabilitator  or similar  officer for it or for all or any
        material part of its  property;  or any  receiver,  trustee,  custodian,
        conservator,  liquidator,  rehabilitator or similar officer is appointed
        without the  application or consent of Borrower or such  Subsidiary;  or
        any  proceeding  under  Debtor  Relief Laws  relating to Borrower or any
        Subsidiary  or to all or any  part of  Borrower's  or such  Subsidiary's
        property  is  instituted   without  the  consent  of  Borrower  or  such
        Subsidiary, or an order for relief is entered in any such proceeding; or

   (k)  Any event occurs which has a Material Adverse Effect; or

   (l)  An "Event of  Default"  (as such term is  defined  in the Royal  Bank of
        Canada  Credit  Facility)  occurs under the Royal Bank of Canada  Credit
        Facility; or

   (m)  The North American Vaccine  Acquisition  Agreement shall not be executed
        by the  Borrower  and  Guarantor on or prior to November 16, 1999 or the
        North  American  Vaccine  Acquisition  shall  be  unwound,  reversed  or
        otherwise  rescinded in whole or in any material  part for any reason or
        the North American Vaccine Acquisition Agreement or any letter of intent
        associated therewith shall be terminated by any party thereto; or

   (n)  An  "Event of  Default"  (as such term is  defined  in (x) that  certain
        Indenture  dated as of May 7, 1996 between  Borrower and Marine  Midland
        Bank (the "MARINE  MIDLAND  INDENTURE"),  or (y) that certain  Indenture
        dated November 12, 1998, between Borrower and Bankers Trust Company (the
        "BT  Indenture"))  occurs under the Marine  Midland  Indenture or the BT
        Indenture; or

   (o)  Any Change of Control.

   Upon the occurrence of an Event of Default, Lender may declare the Commitment
   to be  terminated,  whereupon  the  Commitment  shall be  terminated,  and/or
   declare all sums outstanding  hereunder and under the other Loan Documents to
   be immediately due and payable,  together with all interest thereon,  without
   notice of default,  presentment  or demand for payment,  protest or notice of
   nonpayment or dishonor, or other notices or demands of any kind or character,
   all of which are hereby expressly waived;  PROVIDED,  HOWEVER,  that upon the
   occurrence of any event  specified in Paragraph  5(j) above,  the  Commitment
   shall automatically  terminate,  and all sums outstanding hereunder and under
   each other Loan Document shall become  immediately due and payable,  together
   with all interest thereon,  without notice of default,  presentment or demand

                                      -17-
<PAGE>

   for payment, protest or notice of nonpayment or dishonor, or other notices or
   demands of any kind or character, all of which are hereby expressly waived.

6. MISCELLANEOUS.

   (a)   All financial computations required under this Agreement shall be made,
         and all financial  information  required under this Agreement  shall be
         prepared,  in accordance with generally accepted accounting  principles
         consistently applied.

   (b)   All  references  herein and in the other Loan  Documents to any time of
         day shall mean the local  (standard or daylight,  as in effect) time of
         Charlotte, North Carolina.

   (c)   All Breakage Costs shall be for the account of Borrower.

   (d)   If at any time  Lender,  in its sole  discretion,  determines  that (i)
         deposits  in the  amount of any  requested  Offshore  Rate Loan for any
         requested  Interest  Period are not available to Lender in the offshore
         dollar interbank  market, or (ii) the Offshore Rate does not accurately
         reflect the  funding  cost to Lender of lending  such  Loans,  Lender's
         obligation  to make  Offshore  Rate  Loans  shall  cease for the period
         during which such circumstance exists.

   (e)   Borrower shall  reimburse or compensate  Lender,  upon demand,  for all
         costs  incurred,  losses  suffered or payments made by Lender which are
         applied  or  reasonably   allocated  by  Lender  to  the   transactions
         contemplated  herein  (all as  determined  by Lender in its  reasonable
         discretion) by reason of any and all future reserve,  deposit,  capital
         adequacy  or similar  requirements  against (or against any class of or
         change in or in the amount of) assets,  liabilities or commitments  of,
         or extensions of credit by,  Lender;  and compliance by Lender with any
         directive,  or requirements from any regulatory  authority,  whether or
         not having the force of law.

   (f)   No  amendment or waiver of any  provision  of this  Agreement or of any
         other Loan Document and no consent by Lender to any departure therefrom
         by Borrower shall be effective unless such amendment, waiver or consent
         shall be in writing and signed by a duly authorized  officer of Lender,
         and any such amendment,  waiver or consent shall then be effective only
         for the  period and on the  conditions  and for the  specific  instance
         specified in such writing.  No failure or delay by Lender in exercising
         any  right,  power or  privilege  hereunder  shall  operate as a waiver
         thereof,  nor shall any single or partial exercise thereof preclude any
         other or further  exercise thereof or the exercise of any other rights,
         power or privilege.


                                      -18-
<PAGE>

   (g)   Except  as  otherwise  expressly  provided  herein,  notices  and other
         communications  to each party  provided  for herein shall be in writing
         and shall be delivered by hand or overnight courier service,  mailed or
         sent by  telecopy  or  electronic  mail to the address set forth on the
         signature page hereto or as otherwise  provided in writing from time to
         time by such  party.  Any such  notice or other  communication  sent by
         overnight  courier service,  mail or telecopy shall be effective on the
         earlier of actual receipt and (i) if sent by overnight courier service,
         the scheduled  delivery date, (ii) if sent by mail, the fourth Business
         Day after  deposit in the U.S. mail first class  postage  prepaid,  and
         (iii)  if  sent by  telecopy,  when  transmission  in  legible  form is
         complete.  All notices and other communications sent by the other means
         listed in the first sentence of this paragraph  shall be effective upon
         receipt. Notwithstanding anything to the contrary contained herein, all
         notices (by whatever means) to Lender pursuant to PARAGRAPH 1(B) hereof
         shall be effective only upon receipt.

   (h)   This  Agreement  shall inure to the  benefit of the parties  hereto and
         their respective  successors and assigns,  except that Borrower may not
         assign its rights and obligations hereunder. LENDER MAY AT ANY TIME (I)
         ASSIGN ALL OR ANY PART OF ITS RIGHTS AND  OBLIGATIONS  HEREUNDER TO ANY
         OTHER  PERSON  WITH THE  CONSENT OF  BORROWER,  SUCH  CONSENT NOT TO BE
         UNREASONABLY   WITHHELD,    PROVIDED   BORROWER   HEREBY   SPECIFICALLY
         ACKNOWLEDGES  AND AGREES THAT NO SUCH CONSENT  SHALL BE REQUIRED IF THE
         ASSIGNMENT IS TO (A) AN AFFILIATE OF LENDER,  (B) GUARANTOR OR (C) IF A
         DEFAULT OR EVENT OF DEFAULT EXISTS,  AND (II) GRANT TO ANY OTHER PERSON
         PARTICIPATING  INTERESTS  IN ALL OR PART OF ITS RIGHTS AND  OBLIGATIONS
         HEREUNDER  WITHOUT NOTICE TO BORROWER.  Borrower  agrees to execute any
         documents  reasonably  requested by Lender in connection  with any such
         assignment.  All  information  provided  by or on behalf of Borrower to
         Lender or its  affiliates  may be furnished by Lender to its affiliates
         and to any actual or proposed assignee or participant.

   (i)   Borrower  shall pay Lender,  on demand,  all  reasonable  out-of-pocket
         expenses and legal fees  (including  the  allocated  costs for in-house
         legal  services)  incurred by Lender in connection with the enforcement
         of  this  Agreement  or  any  instruments  or  agreements  executed  in
         connection herewith.

   (j)   If any provision of this  Agreement or any other Loan Document shall be
         held invalid or  unenforceable  in whole or in part, such invalidity or
         unenforceability  shall not affect the remaining  provisions  hereof or
         thereof.  This  Agreement  supersedes  all  prior  agreements  and oral
         negotiations with respect to the subject matter hereof.


                                      -19-
<PAGE>

   (k)   This  Agreement may be executed in one or more  counterparts,  and each
         counterpart, when so executed, shall be deemed an original but all such
         counterparts shall constitute but one and the same instrument.

   (l)   This  Agreement and the other Loan Documents are governed by, and shall
         be construed in accordance  with, the laws of the State of New York and
         the applicable  laws of the United States of America.  Borrower  hereby
         submits to the nonexclusive  jurisdiction of the United States District
         Court and each state court in the City of New York for the  purposes of
         all legal  proceedings  arising  out of or  relating to any of the Loan
         Documents   or  the   transactions   contemplated   thereby.   Borrower
         irrevocably  consents to the service of any and all process in any such
         action or  proceeding  by the  mailing  of copies  of such  process  to
         Borrower  at its  address  set  forth  beneath  its  signature  hereto.
         Borrower  irrevocably  waives,  to the fullest extent permitted by law,
         any objection  which it may now or hereafter  have to the laying of the
         venue of any such proceeding brought in such a court and any claim that
         any such  proceeding  brought  in such a court has been  brought  in an
         inconvenient forum.

   (m)   BORROWER  AND LENDER EACH WAIVE THEIR  RESPECTIVE  RIGHTS TO A TRIAL BY
         JURY OF ANY CLAIM OR CAUSE OF ACTION  BASED UPON OR  ARISING  OUT OF OR
         RELATED TO THIS AGREEMENT, THE OTHER LOAN DOCUMENTS OR THE TRANSACTIONS
         CONTEMPLATED HEREBY OR THEREBY.

   (n)   THIS  AGREEMENT  AND THE  OTHER  LOAN  DOCUMENTS  REPRESENT  THE  FINAL
         AGREEMENT  BETWEEN THE PARTIES AND MAY NOT BE  CONTRADICTED BY EVIDENCE
         OF  PRIOR,  CONTEMPORANEOUS,  OR  SUBSEQUENT  ORAL  AGREEMENTS  OF  THE
         PARTIES. THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE PARTIES.


                                      -20-
<PAGE>


Please  indicate your  acceptance of the  Commitment on the foregoing  terms and
conditions  by returning an executed copy of this  Agreement to the  undersigned
not later than November 1, 1999.


                                      BANK OF AMERICA, N.A.


                                      By:/s/ Lawrence J. Gordon
                                         -----------------------------------
                                      Name:    Lawrence J. Gordon
                                      Title:   Vice President

                                      Notice Address:

                                      Bank of America Center
                                      700 Louisiana Street, TX4-213-08-10
                                      Houston, Texas  77002-2700
                                      Attention: Lawrence J. Gordon
                                                 Vice President
                                      Fax No.:   713-247-6719

ACCEPTED AND AGREED TO:


NORTH AMERICAN VACCINE, INC.


By:    /s/ Randal Chase
       -------------------------------
Name:  Randal Chase, Ph.D.
       -------------------------------
Title: Chief Executive Officer & President
       -----------------------------------

Date: November 1, 1999

Notice Address:

10150 Old Columbia Road
Columbia, Maryland  21046
Attention:  Vice-President
Fax No.:  (410) 309-4077


                                      -21-
<PAGE>

                                                                       EXHIBIT A

                                   DEFINITIONS

Affiliate:       Any Person directly or indirectly  controlling,  controlled by,
                 or under direct or indirect  common control with,  Borrower.  A
                 Person shall be deemed to be  "controlled  by" any other Person
                 if such other Person possesses,  directly or indirectly,  power
                 (a) to vote 10% or more of the  securities  (on a fully diluted
                 basis)  having  ordinary  voting  power  for  the  election  of
                 directors  or managing  general  partners;  or (b) to direct or
                 cause the  direction  of the  management  and  policies of such
                 Person whether by contract or otherwise.

Agreement:       This  letter  agreement,  as  amended,  restated,     extended,
                 supplemented  or  otherwise  modified  in writing  from time to
                 time.

Base Rate:       A fluctuating rate  per  annum  equal  to the higher of (a) the
                 Federal  Funds Rate plus 1/2 of 1% and (b) the rate of interest
                 publicly  announced  from  time to time by  Lender as its prime
                 rate.  The  Lender's  prime rate is a rate set by Lender  based
                 upon  various  factors  including  Lender's  costs and  desired
                 return,  general economic conditions and other factors,  and is
                 used as a reference point for pricing some loans,  which may be
                 priced at, above,  or below such announced  rate. Any change in
                 the prime rate  announced  by Lender  shall take  effect at the
                 opening  of  business  on  the  day  specified  in  the  public
                 announcement of such change.

Base Rate Loan:  A Loan bearing interest based on the Base Rate.

Breakage Costs:  Any  loss,  cost  or expense incurred by Lender  (including any
                 loss of  anticipated  profits  and any loss or expense  arising
                 from the  liquidation  or  reemployment  of funds  obtained  by
                 Lender to maintain the relevant Offshore Rate Loan or from fees
                 payable to terminate  the  deposits  from which such funds were
                 obtained)  as a  result  of (i) any  continuation,  conversion,
                 payment or  prepayment of any Offshore Rate Loan on a day other
                 than the  last day of the  Interest  Period  therefor  (whether
                 voluntary,  mandatory, automatic, by reason of acceleration, or
                 otherwise); or (ii) any failure by Borrower (for a reason other
                 than the  failure of Lender to make a Loan when all  conditions
                 to making  such Loan have been met by  Borrower  in  accordance
                 with the terms hereof) to prepay,  borrow,  continue or convert
                 any Offshore  Rate Loan on a date or in the amount  notified by

                                      A-1
<PAGE>

                 Borrower.  The  certificate of Lender as to its costs of funds,
                 losses  and  expenses   incurred  shall  be  conclusive  absent
                 manifest error.

Business Day:    Any day other than a  Saturday,  Sunday,  or other day on which
                 commercial  banks are authorized to close under the laws of, or
                 are in fact  closed  in,  the  State  of North  Carolina  where
                 Lender's  lending office is located and, if such day relates to
                 any Offshore Rate Loan, means any such day on which dealings in
                 dollar  deposits  are  conducted  by and  between  banks in the
                 offshore dollar interbank market.

Change of
Control:         Any  of  the  following  events:  (a)  any "person"  or "group"
                 (within the meaning of Section 13(d) or 14(d) of the Securities
                 Exchange  Act)  (other  than  one  or  more  of  the  Principal
                 Shareholders)   has  become,   directly  or   indirectly,   the
                 "beneficial  owner" (as  defined in Rules 13d-3 and 13d-5 under
                 the  Securities  Exchange  Act,  except that a Person  shall be
                 deemed to have a "beneficial  ownership" of all shares that any
                 such  Person has the right to  acquire,  whether  such right is
                 exercisable  immediately or only after the passage of time), by
                 way of merger,  consolidation  or otherwise,  of 20% or more of
                 the  voting  power  of  the  Voting  Stock  of  Borrower  on  a
                 fully-diluted  basis, after giving effect to the conversion and
                 exercise  of  all  outstanding  warrants,   options  and  other
                 securities  of Borrower  convertible  into or  exercisable  for
                 Voting Stock of Borrower  (whether or not such  securities  are
                 then currently  convertible or exercisable);  or (b) during any
                 period of two consecutive  calendar  years,  individuals who at
                 the beginning of such period constituted the board of directors
                 of Borrower  (together with any new directors whose election to
                 such board or whose nomination for election by the stockholders
                 of  Borrower  was  approved  by a  vote  of a  majority  of the
                 directors then still in office who were either directors at the
                 beginning of such period or whose  election or  nomination  for
                 election  was  previously  approved)  cease  for any  reason to
                 constitute  a majority  of the board of  directors  of Borrower
                 then in office;  or (c) the  failure of Biochem  Pharma Inc. at
                 any time to directly own  beneficially and of record on a fully
                 diluted basis at least 35% of the Voting Stock of Borrower.

Closing Date:    Means the date of this Agreement.

Code:            The  Internal  Revenue  Code  of  1986, as amended from time to
                 time.

Contractual
Obligation:      Any  provision of any security  issued by such Person or of any
                 agreement,  instrument or undertaking to which such Person is a
                 party or by which it or any of its property is bound.


                                      A-2
<PAGE>

Debtor Relief
Laws:            The  Bankruptcy  Code of the United States of  America, and all
                 other liquidation, conservatorship,  bankruptcy, assignment for
                 the   benefit   of   creditors,   moratorium,    rearrangement,
                 receivership,  insolvency,  reorganization,  or similar  debtor
                 relief laws of the United States of America or other applicable
                 jurisdictions  from time to time in effect affecting the rights
                 of creditors generally.

Default:         Any event that,  with the giving of any notice,  the passage of
                 time, or both, would be an Event of Default.

Disposition:     The sale, transfer, license or other disposition (including any
                 sale and leaseback  transaction) of any property by any Person,
                 including any sale, assignment, transfer or other disposal with
                 or without recourse of any notes or accounts  receivable or any
                 rights and claims associated therewith.

ERISA:           The  Employee  Retirement  Income  Security Act of 1974 and any
                 regulations  issued pursuant  thereto,  as amended from time to
                 time.

Event of
Default:         Has the meaning set forth in Paragraph 5.

Federal Funds
Rate:            For any day, the rate per annum (rounded upwards, if necessary,
                 to the nearest  1/100 of 1%) equal to the  weighted  average of
                 the rates on overnight Federal funds  transactions with members
                 of the Federal Reserve System arranged by Federal funds brokers
                 on such day, as  published  by the Federal  Reserve Bank of New
                 York on the Business  Day next  succeeding  such day;  PROVIDED
                 that (a) if such day is not a Business  Day, the Federal  Funds
                 Rate for such day  shall be such rate on such  transactions  on
                 the next  preceding  Business  Day as so  published on the next
                 succeeding  Business  Day,  and  (b)  if  no  such  rate  is so
                 published  on such next  succeeding  Business  Day, the Federal
                 Funds Rate for such day shall be the  average  rate  charged to
                 Lender  on  such  day on such  transactions  as  determined  by
                 Lender.

Governmental
Authority:       Any (a)  international,  foreign,  federal,  state,  county  or
                 municipal  government,  or political  subdivision  thereof, (b)
                 governmental or quasi-governmental  agency,  authority,  board,
                 bureau, commission, department,  instrumentality,  central bank
                 or public body, or (c) court, administrative tribunal or public
                 utility.

Guarantor:       Baxter International, Inc., a Delaware Corporation.

Guaranty:        The  Guaranty  dated as of the date of the  Agreement  given by
                 Guarantor for the benefit of Lender.






                                      A-3
<PAGE>

Guaranty Event
of Default:      Has the meaning set forth in the Guaranty.

Guaranty
Obligation:      Any (a)  guaranty  by a Person  of  Indebtedness  of,  or other
                 obligation  payable or performable  by, any other Person or (b)
                 assurance,  agreement,  letter  of  responsibility,  letter  of
                 awareness,  undertaking or arrangement  given by a Person to an
                 obligee of any other  Person  with  respect  to the  payment or
                 performance of an obligation by, or the financial condition of,
                 such other  Person,  whether  direct,  indirect or  contingent,
                 including  any purchase or repurchase  agreement  covering such
                 obligation or any collateral  security therefor,  any agreement
                 to provide funds (by means of loans,  capital  contributions or
                 otherwise) to such other  Person,  any agreement to support the
                 solvency  or  level of any  balance  sheet  item of such  other
                 Person or any  "keep-well"  or other  arrangement  of  whatever
                 nature  given for the purpose of  assuring or holding  harmless
                 such obligee  against loss with  respect to any  obligation  of
                 such other Person;  PROVIDED,  HOWEVER,  that the term Guaranty
                 Obligation  shall not include  endorsements  of instruments for
                 deposit or collection in the ordinary  course of business.  The
                 amount  of any  Guaranty  Obligation  shall be  deemed to be an
                 amount  equal  to the  stated  or  determinable  amount  of the
                 related primary obligation, or portion thereof, covered by such
                 Guaranty  Obligation  or, if not  stated or  determinable,  the
                 maximum reasonably  anticipated liability in respect thereof as
                 determined by the Person in good faith.

Indebtedness:    As to any Person at a particular  time,  all items which would,
                 in conformity  with GAAP, be  classified  as  liabilities  on a
                 balance sheet of such Person as at such time  (excluding  trade
                 and other accounts  payable in the ordinary  course of business
                 in  accordance  with  customary  trade  terms and which are not
                 overdue  for a  period  of  more  than 60  days  and  excluding
                 deferred  taxes),   but  in  any  event   including:   (a)  all
                 obligations   of  such  Person  for  borrowed   money  and  all
                 obligations  of such  Person  evidenced  by bonds,  debentures,
                 notes  or  other  similar   instruments;   (b)  any  direct  or
                 contingent  obligations of such Person arising under letters of
                 credit   (including    standby   and   commercial),    banker's
                 acceptances,   bank   guaranties,   surety  bonds  and  similar
                 instruments;  (c) net obligations under any Swap Contract in an
                 amount equal to (i) if such Swap  Contract has been closed out,
                 the  termination  value thereof,  or (ii) if such Swap Contract
                 has not been  closed  out,  the  mark-to-market  value  thereof
                 determined  on  the  basis  of  readily  available   quotations
                 provided by any recognized  dealer in such Swap  Contract;  (d)

                                      A-4
<PAGE>

                 whether or not so included as  liabilities  in accordance  with
                 GAAP,  all  obligations  of such  Person  to pay  the  deferred
                 purchase  price  of  property  or  services,  and  indebtedness
                 (excluding  prepaid  interest  thereon)  secured  by a Lien  on
                 property  owned or being  purchased  by such Person  (including
                 indebtedness  arising  under  conditional  sales or other title
                 retention  agreements),  whether or not such indebtedness shall
                 have been assumed by such Person or is limited in recourse; (e)
                 lease payment  obligations  under  capital  leases or Synthetic
                 Lease  Obligations;  and (f) all Guaranty  Obligations  of such
                 Person in respect of any of the foregoing.

                 For all purposes of this  Agreement,  the  Indebtedness  of any
                 Person shall include the  Indebtedness  of any  partnership  or
                 joint  venture in which such  Person is a general  partner or a
                 joint venturer.

Intellectual
Property:        Has the meaning set forth in PARAGRAPH 3(K).

Interest
Period:          For  each  Offshore  Rate  Loan,  (a)  initially,   the  period
                 commencing  on the date the Offshore  Rate Loan is disbursed or
                 converted from a Base Rate Loan and (b) thereafter,  the period
                 commencing  on the last day of the preceding  Interest  Period,
                 and, in each case,  ending on the  earlier of (x) the  Maturity
                 Date and (y) one month  thereafter,  as  requested by Borrower;
                 PROVIDED that:

                 (i) any Interest  Period that would otherwise end on a day that
                     is not a  Business  Day  shall  be  extended  to  the  next
                     succeeding  Business Day unless such  Business Day falls in
                     another  calendar month, in which case such Interest Period
                     shall end on the next preceding Business Day; and

                (ii) any Interest  Period which begins on the last  Business Day
                     of a  calendar  month  (or on a day for  which  there is no
                     numerically  corresponding day in the calendar month at the
                     end of such Interest Period) shall end on the last Business
                     Day of the  calendar  month  at the  end of  such  Interest
                     Period.

Investment:      Any  acquisition or any  investment by such Person,  whether by
                 means of the  purchase or other  acquisition  of stock or other
                 securities of any other Person or by means of a loan,  creating
                 a debt, capital contribution,  guaranty or other debt or equity
                 participation  or interest in any other  Person,  including any
                 partnership and joint venture interests in such other Person.


                                      A-5
<PAGE>

IP Security
Agreement:       The Patent and  Trademark  Assignment  and  Security  Agreement
                 dated as of the Closing Date between Borrower, as assignor, and
                 Lender, as assignee.

Lien:            Any  mortgage,  pledge,  hypothecation,   assignment,   deposit
                 arrangement  (in the  nature  of  compensating  balances,  cash
                 collateral accounts or security interests),  encumbrance,  lien
                 (statutory or other), charge, or preference,  priority or other
                 security  interest or  preferential  arrangement of any kind or
                 nature   whatsoever   (including,   without   limitation,   any
                 conditional  sale  or  other  title  retention  agreement,  any
                 financing lease having  substantially  the same economic effect
                 as  any of the  foregoing,  and  the  filing  of any  financing
                 statement under the Uniform  Commercial Code or comparable laws
                 of any jurisdiction),  including the interest of a purchaser of
                 accounts receivable.

Loan Documents:  This  Agreement,   the   Security  Agreement,  the  IP Security
                 Agreement and any  promissory  note,  certificate,  fee letter,
                 financing statement and other instrument, document or agreement
                 delivered  in  connection  with this  Agreement or the Security
                 Agreement or the IP Security Agreement.

Material
Adverse Effect:  Any  set  of circumstances or events  which   (a ) has or could
                 reasonably  be expected  to have any  material  adverse  effect
                 whatsoever  upon the  validity  or  enforceability  of any Loan
                 Document, (b) is or could reasonably be expected to be material
                 and adverse to the condition (financial or otherwise), business
                 operations or prospects of Borrower or (c)  materially  impairs
                 or could  reasonably  be  expected  to  materially  impair  the
                 ability of Borrower to perform its  obligations and liabilities
                 under  this  Agreement  or any other Loan  Document;  provided,
                 however,  that a Material  Adverse  Effect under this Agreement
                 shall not  include  any  circumstances  or  events  (including,
                 without limitation,  any loss of personnel,  loss of customers,
                 loss of  suppliers or the delay or  cancellation  of any orders
                 for  products):  (i)  relating to the economy in general,  (ii)
                 relating to the industry in which Borrower operates in general,
                 (iii)  relating  to any  actions  taken by The  American  Stock
                 Exchange  with  respect  to its  letter to the  Borrower  dated
                 September  24,  1999,  (iv)  arising out of or  resulting  from
                 actions  contemplated  by the  Borrower  and the  Guarantor  in
                 connection  with, or which is attributable to, the announcement
                 of this Agreement and/or the transactions  contemplated  hereby
                 (including,  without limitation, the Guarantor's acquisition of
                 the  Borrower),  or (v)  relating to the release of  Borrower's
                 financial results or Borrower's  failure to meet any publicized
                 financial  projections  for so long as  Borrower's  revenue and

                                      A-6
<PAGE>


                 expenses are substantially in accordance with the Projections.

Maturity Date:   March 31, 2000, or  such  earlier  date on which the Commitment
                 may terminate in accordance with the terms hereof.

Multiemployer
Plan:            Any  employee  benefit  plan of the type  described  in Section
                 4001(a)(3) of ERISA.

Negative
Pledge:          A Contractual Obligation that restricts Liens on property.

North American   The  acquisition by Guarantor of Borrower pursuant to the North
Vaccine          American   Vaccine   Acquisition   Agreement  and   all   other
Acquisition:     transactions   contemplated  by  the  North  American   Vaccine
                 Acquisition Agreement.

North American   The  Agreement  and  Plan  of Merger to be entered into between
Vaccine          Guarantor and Borrower, in  substantially  the form  of EXHIBIT
Acquisition      C hereto, as amended or modified from time to time as agreed to
Agreement:       by the parties thereto.

Offshore Rate:   For any Interest Period with respect to any Offshore Rate Loan,
                 a rate per annum  determined pursuant to the following formula:

                      Offshore Rate =      Offshore Base Rate
                                     -------------------------------------
                                     1.00 - Eurodollar Reserve Percentage
                      Where,

                           "OFFSHORE BASE RATE" means, for such Interest Period:

                           (a) the  rate per  annum  (carried  out to the  fifth
                               decimal  place) equal to the rate  determined  by
                               Lender to be the offered rate that appears on the
                               page of the  Telerate  Screen  that  displays  an
                               average  British  Bankers  Association   Interest
                               Settlement  Rate (such page currently  being page
                               number   3750)  for   deposits  in  dollars  (for
                               delivery  on  the  first  day  of  such  Interest
                               Period) with a term  equivalent  to such Interest
                               Period, determined as of approximately 11:00 a.m.
                               (London  time)  two  Business  Days  prior to the
                               first day of such Interest Period, or

                           (b) in the event the rate referenced in the preceding
                               clause  (a)  does  not  appear  on  such  page or
                               service or such page or service shall cease to be
                               available,  the rate per  annum  (carried  to the
                               fifth decimal place) equal to the rate determined

                                      A-7
<PAGE>

                               by Lender to be the  offered  rate on such  other
                               page or other  service  that  displays an average
                               British Bankers  Association  Interest Settlement
                               Rate for deposits in dollars (for delivery on the
                               first day of such  Interest  Period)  with a term
                               equivalent to such Interest Period, determined as
                               of  approximately  11:00 a.m.  (London  time) two
                               Business  Days  prior  to the  first  day of such
                               Interest Period, or

                           (c) in  the  event  the  rates   referenced   in  the
                               preceding  clauses (a) and (b) are not available,
                               the rate per  annum  determined  by Lender as the
                               rate of interest at which  dollar  deposits  (for
                               delivery  on  the  first  day  of  such  Interest
                               Period)  in same  day  funds  in the  approximate
                               amount of the  applicable  Offshore Rate Loan and
                               with a term  equivalent to such  Interest  Period
                               would be offered  by  Lender's  London  Branch to
                               major  banks in the  offshore  dollar  market  at
                               their request at approximately 11:00 a.m. (London
                               time) two Business Days prior to the first day of
                               such Interest Period.


                           "EURODOLLAR  RESERVE  PERCENTAGE"  means, for any day
                           during any Interest  Period,  the reserve  percentage
                           (expressed as a decimal,  rounded  upward to the next
                           1/100th  of 1%) in effect on such day  applicable  to
                           Lender under regulations  issued from time to time by
                           the Board of Governors of the Federal  Reserve System
                           for  determining  the  maximum  reserve   requirement
                           (including  any  emergency,   supplemental  or  other
                           marginal   reserve   requirement)   with  respect  to
                           Eurocurrency   funding  (currently   referred  to  as
                           "Eurocurrency  liabilities").  The Offshore  Rate for
                           each outstanding Offshore Rate Loan shall be adjusted
                           automatically  as of the effective date of any change
                           in the Eurodollar Reserve Percentage.

Offshore Rate
Loan:            A Loan bearing interest based on the Offshore Rate.

Pension Plan:    Any  "employee  pension  benefit plan" (as such term is defined
                 in Section 3(2) of ERISA),  other  than  a  Multiemployer Plan,
                 that  is  subject  to  Title  IV  of  ERISA and is sponsored or
                 maintained  by  Borrower  or any ERISA  Affiliates  or to which
                 Borrower  or  any  ERISA   Affiliate   contributes  or  has  an
                 obligation to contribute, or in the case of a multiple employer

                                      A-8
<PAGE>

                 plan (as  described  in  Section  4064(a)  of  ERISA)  has made
                 contributions at any time during the immediately preceding five
                 plan years.

Person:          Any  individual,  trustee,  corporation,  general  partnership,
                 limited  partnership,  limited liability  company,  joint stock
                 company,  trust,  unincorporated  organization,  bank, business
                 association,  firm, joint venture,  governmental  authority, or
                 otherwise.

Plan:            Any  employee  benefit plan  maintained  or  contributed  to by
                 Borrower  or  by  any  trade  or   business   (whether  or  not
                 incorporated)  under common control with Borrower as defined in
                 Section  4001(b) of ERISA and  insured by the  Pension  Benefit
                 Guaranty Corporation under Title IV of ERISA.

Principal
Shareholder:     Each of  Guarantor,  Biochem  Pharma Inc.,  Dr.  Phillip  Frost
                 and/or Frost-Nevada Limited Partnership

Projections:     The projections of balance sheets, statements of cash flows and
                 comparative   statements  of  operations  (2000  Forecast)  for
                 Borrower  dated  October  25, 1999 and  delivered  to Lender by
                 Borrower prior to the Closing Date.

Reimbursement
Agreement:       That certain  Reimbursement  Agreement  dated as of November 1,
                 1999 between Borrower and Guarantor.

Restricted
Payment:         (a) The  declaration or payment of any dividend or distribution
                 by  Borrower  or any of its  Subsidiaries,  either  in  cash or
                 property,  on any shares of the  capital  stock of any class of
                 Borrower  or  any  of  its  Subsidiaries;   (b)  the  purchase,
                 repayment,  redemption  or retirement by Borrower or any of its
                 Subsidiaries of any shares of its capital stock of any class or
                 any  warrants,  rights or options to  purchase  or acquire  any
                 shares of its capital  stock,  whether  directly or indirectly;
                 (c) any other payment or distribution by Borrower or any of its
                 Subsidiaries  in respect of its capital stock,  either directly
                 or  indirectly;  (d) any  Investment  other than an  Investment
                 otherwise  permitted  under  any  Loan  Document;  and  (e) the
                 prepayment,   repayment,   redemption,   defeasance   or  other
                 acquisition  or  retirement  for value  prior to any  scheduled
                 maturity,   scheduled   repayment  or  scheduled  sinking  fund
                 payment,  of any Indebtedness not otherwise permitted under any
                 Loan Document to be so paid.

Royal Bank of
Canada Credit    (A) That certain letter agreement dated July 12, 1999 delivered
Facility:        by  Royal  Bank  of  Canada  and  accepted by Borrower, Biochem


                                      A-9
<PAGE>

                 Pharma Inc. and Biochem  Pharma  Holdings Inc., in an aggregate
                 principal  amount  of up  to  US$6.0MM  and  (B)  that  certain
                 Guarantee and  Postponement  of Claims from Biochem Pharma Inc.
                 and  Biochem  Pharma  Holdings  Inc.  in favor of Royal Bank of
                 Canada dated July 1, 1999.

Securities
Exchange Act:    The Securities Exchange  Act of 1934, as amended, and all rules
                 and regulations issued pursuant thereto.

Security
Agreement:       The  Security  Agreement  dated as of the Closing  Date between
                 Borrower, as debtor, and Lender, as secured party.

Subsidiary:      A corporation,  partnership,  joint venture,  limited liability
                 company or other  business  entity of which a  majority  of the
                 shares of securities or other interests  having ordinary voting
                 power for the  election of directors  or other  governing  body
                 (other than  securities or interests  having such power only by
                 reason  of the  happening  of a  contingency)  are at the  time
                 beneficially  owned,  or the  management  of which is otherwise
                 controlled,   directly,  or  indirectly  through  one  or  more
                 intermediaries, or both, by Borrower.

Swap Contract:   (a)  Any  and all rate swap transactions,  basis swaps, forward
                 rate transactions,  commodity swaps, commodity options, forward
                 commodity  contracts,  equity or equity index swaps or options,
                 bond or bond  price or bond  index  swaps or options or forward
                 bond or forward bond price or forward bond index  transactions,
                 interest rate options,  forward foreign exchange  transactions,
                 cap  transactions,  floor  transactions,  collar  transactions,
                 currency   swap   transactions,    cross-currency   rate   swap
                 transactions,   currency   options,   or  any   other   similar
                 transactions  or  any  combination  of  any  of  the  foregoing
                 (including  any  options to enter  into any of the  foregoing),
                 whether or not any such  transaction  is governed by or subject
                 to any master agreement, or (b) any and all transactions of any
                 kind, and the related  confirmations,  which are subject to the
                 terms and  conditions  of, or  governed  by, any form of master
                 agreement  published by the International Swaps and Derivatives
                 Association,  Inc.,  or any other  master  agreement  (any such
                 master  agreement,  together  with any  related  schedules,  as
                 amended, restated, extended, supplemented or otherwise modified
                 in writing from time to time, a "MASTER AGREEMENT"),  including
                 but not  limited to any such  obligations  or liabilities under
                 any Master Agreement.

Synthetic Lease
Obligations:     All  monetary  obligations  of a Person  under (a) a  so-called
                 synthetic  lease, or (b) an agreement for the use or possession

                                      A-10
<PAGE>

                 of  property  creating  obligations  which do not appear on the
                 balance sheet of such Person but which,  upon the insolvency or
                 bankruptcy  of  such  Person,  would  be  characterized  as the
                 Indebtedness  of such  Person  (without  regard  to  accounting
                 treatment).

Voting Stock:    All classes  of  capital stock of Borrower then outstanding and
                 normally entitled to vote in the election of directors.




                                      A-11
<PAGE>
                                                                       EXHIBIT B

                             FORM OF PROMISSORY NOTE


$30,000,000                                                  _____________, 1999


         FOR VALUE RECEIVED,  the undersigned,  NORTH AMERICAN VACCINE,  INC., a
___________  corporation  ("BORROWER"),  hereby  promises to pay to the order of
BANK OF AMERICA,  N.A.  ("LENDER") the principal sum of Thirty  Million  Dollars
(US$30,000,000)  or, if less, the aggregate unpaid principal amount of all Loans
made by  Lender  to  Borrower  pursuant  to the  letter  agreement,  dated as of
[__________,  1999] (such  letter  agreement,  as it may be  amended,  restated,
extended,   supplemented  or  otherwise   modified  from  time  to  time,  being
hereinafter  called  the  "AGREEMENT"),  between  Borrower  and  Lender,  on the
Maturity Date. Borrower further promises to pay interest on the unpaid principal
amount of the Loans  evidenced  hereby  from time to time at the  rates,  on the
dates, and otherwise as provided in the Agreement.

         Lender is  authorized  to endorse the amount and the date on which each
Loan is made or converted, the Interest Period therefor (if applicable) and each
payment of principal  with respect  thereto on the schedules  annexed hereto and
made a part hereof,  or on continuations  thereof which shall be attached hereto
and made a part hereof; PROVIDED that any failure to so endorse such information
on such  schedule  or  continuation  thereof  or any error in doing so shall not
limit or otherwise affect any obligation of Borrower under the Agreement or this
promissory note.

         This  promissory  note is the  promissory  note  referred to in, and is
entitled to the benefits of, the Agreement, which Agreement, among other things,
contains  provisions  for  acceleration  of the maturity of the Loans  evidenced
hereby upon the happening of certain  stated events and also for  prepayments on
account of principal  of the Loans prior to the maturity  thereof upon the terms
and conditions therein specified.

         Unless  otherwise  defined  herein,  terms defined in the Agreement are
used herein with their defined meanings  therein.  This promissory note shall be
governed by, and  construed in accordance  with,  the laws of the State of North
Carolina.

                                      NORTH AMERICAN VACCINE, INC.


                                      By:
                                         ---------------------------------------
                                      Name:
                                           -------------------------------------
                                      Title:
                                            ------------------------------------



                                      B-1
<PAGE>


<TABLE>
<CAPTION>
                                                                                                                 SCHEDULE A TO NOTE
                BASE RATE LOANS AND REPAYMENT OF BASE RATE LOANS
                ------------------------------------------------

      (1)                        (2)                             (3)                         (4)                      (5)
                                                           Amount of Base Rate
                           Amount of Base Rate               Loan Repaid or          Unpaid Principal
                         Loan Made or Converted           Converted to Offshore      Balance of Base               Notation
     Date                from Offshore Rate Loan               Rate Loan                 Rate Loans                Made By
     ----                -----------------------               ---------                 ----------                --------

<S>                      <C>                              <C>                        <C>                        <C>


 -------------              -------------                   -------------               -------------            -------------

 -------------              -------------                   -------------               -------------            -------------

 -------------              -------------                   -------------               -------------            -------------

 -------------              -------------                   -------------               -------------            -------------

 -------------              -------------                   -------------               -------------            -------------

 -------------              -------------                   -------------               -------------            -------------

 -------------              -------------                   -------------               -------------            -------------

 -------------              -------------                   -------------               -------------            -------------

 -------------              -------------                   -------------               -------------            -------------

 -------------              -------------                   -------------               -------------            -------------

 -------------              -------------                   -------------               -------------            -------------

</TABLE>


                                      B-2
<PAGE>


<TABLE>
<CAPTION>

                                                                                                                 SCHEDULE B TO NOTE

            OFFSHORE RATE LOANS AND REPAYMENT OF OFFSHORE RATE LOANS
            --------------------------------------------------------

        (1)          (2)                      (3)                  (4)                      (5)                      (6)
                     Amount of                                     Amount of
                     Offshore Rate                                 Offshore Rate            Unpaid Principal
                     Loan Made or                                  Loan Repaid or           Balance of
                     Converted from                                Converted to Base        Offshore Rate            Notation
       DATE          BASE RATE LOAN           INTEREST PERIOD      RATE LOAN                LOANS                    MADE BY
       ----          --------------           ---------------      ---------                -----                    -------
<S>                  <C>                      <C>                  <C>                      <C>                      <C>

- ----------           -------------            ------------         -------------            -------------            -------------

- ----------           -------------            ------------        -------------            -------------            -------------

- ----------           -------------            ------------        -------------            -------------            -------------

- ----------           -------------            ------------        -------------            -------------            -------------

- ----------           -------------            ------------        -------------            -------------            -------------

- ----------           -------------            ------------        -------------            -------------            -------------

- ----------           -------------            ------------         -------------            -------------            -------------

- ----------           -------------            ------------         -------------            -------------            -------------

- ----------           -------------            ------------         -------------            -------------            -------------

- ----------           -------------            ------------         -------------            -------------            -------------

- ----------           -------------            ------------         -------------            -------------            -------------
</TABLE>


                                      B-3
<PAGE>


                                                                       EXHIBIT C


             [Form of North American Vaccine Acquisition Agreement]


<PAGE>


                           SCHEDULE 3(D) TO AGREEMENT
                               MATERIAL LITIGATION

1.)     On November 2, 1998, Sharon Mates, Ph.D., then a director of the Company
and the  Company's  former  president,  initiated  litigation  in United  States
District  Court,  District  of  Maryland  (Civil  Action  No. AW  98-3678)  (the
"Complaint") against the Company, two of its directors and BioChem.

2.)     By letter dated October 7, 1999,  Chiron Behring  GmbH  & Co. ("Chiron")
notified  Borrower that Chiron was  terminating  "for cause" the parties' Supply
and  Distribution  Agreement  dated  December 3, 1996,  as  amended.  Chiron has
alleged that Borrower  misrepresented  the status of regulatory  approval of its
products and  fraudulently  induced Chiron to enter into the agreement,  and has
demanded  repayment from Borrower of $3 million in nonrefundable  payments under
the agreement.


<PAGE>
                           SCHEDULE 3(F) TO AGREEMENT
                                 USE OF PROCEEDS

<TABLE>
<CAPTION>
                                                 SCHEDULE 3(F)
                                     NON-WORKING CAPITAL USES OF PROCEEDS
                                           (THROUGH MARCH 31, 2000)

Preliminary Capital Additions Forecast
10/28/99
                                             DESCRIPTION                     IN PROGRESS VENDOR

<S>                                          <C>                             <C>                     <C>
                                             Cleaning skid                   Whiting Turner         $      16,720
                                             Cleaning skid                   Whiting Turner                 4,146
                                             MSS Project installation costs  Whiting Turner                17,010
                                             Engineering support             Whiting Turner                75,868
                                             services/mening
                                             Four agitators - Mening C       Harrington Robb               24,988
                                             Micro filtration skid/Mening C  Prime Technologies            47,864
                                             HPLC 1100                       Zee Hung Lee                  45,000
                                             Validation - HPLC               Zee Hung Lee                  10,050
                                             Centrifuge                               N/A                   5,000
                                             Integrity Tester                         N/A                  15,000
                                             pH Probes                                N/A                  20,000
                                             Plate washers                            N/A                   6,200
                                             MetOne counters                          N/A                  15,000
                                             RCS Air Samplers                         N/A                  15,000
                                             UV1201 Spectrophotometer                 N/A                   6,500
                                             Biowaste Vessel                          N/A                  50,000
                                             Biowaste Vessel/Startup                  N/A                 100,000
                                             4' Biosafety Cabinet                     N/A                   7,000
                                             UV monitor                               N/A                   2,800
                                             Fraction collector                       N/A                   2,500
                                             Acqua Cal Conductivity Std.              N/A                   3,000
                                             Azonics Temp Std                         N/A                   5,000
                                             Heat block (low temp)                    N/A                   5,950
                                             Heat block (high temp)                   N/A                   5,950
                                             Work benches                             N/A                   5,000
                                             Ultrafiltration skid                     N/A                 200,000
                                             Chem reactor (Men. C)                    N/A                  40,000
                                             Stainless steel tanks                    N/A                  50,000
                                             Miscellaneous                            N/A                   2,384

                                                 Total 4th Qtr 1999                                       803,930
                                                 Additions

                                             Chromatography columns                   N/A                  10,000
                                             UV detector                              N/A                  11,000
                                             Glucose probe                            N/A                   6,000
                                             Plate reader                             N/A                  45,000
                                             Florescent Plate reader                  N/A                  20,000
                                             Gas Chromatograph                        N/A                  35,000
                                             Microscope                               N/A                   6,000
                                             Ultrafiltration skid                     N/A                 200,000
                                             Ultrafiltration skid                     N/A                 200,000
                                             Microfiltration skid                     N/A                 250,000
                                             SS Tank/controller (for                  N/A                  50,000
                                             purification)
                                             YSI analyzer                             N/A                  12,000
                                             Integrated balance and pump              N/A                  20,000
                                             (2)
                                             Air/Oxygen mixer (for                    N/A                  20,000
                                             fermentor) (2)

<PAGE>

                                             Incubator/Shaker                         N/A                   9,000
                                             Floor scale                              N/A                   6,000

                                                 Total 1st Qtr 2000                                       900,000
                                                 Additions

                                             TOTAL CAPEX ADDITIONS 6 MONTHS                         $   1,703,930

INTEREST PAYMENTS
                                             6.5% Notes                                             $   2,448,095
                                             4.5% Notes                                                   562,500
                                                  TOTAL INTEREST PAYMENTS                           $   3,010,595

                                                                                                    =============


</TABLE>

<PAGE>


                           SCHEDULE 3(K) TO AGREEMENT
            LIST OF INTELLECTUAL PROPERTY TO BE PLEDGED AS COLLATERAL


See Schedule A and Schedule B attached hereto.
<PAGE>


<TABLE>
<CAPTION>

- ------------------------------------------------------------------------------------------------------------------------------------
                                                                 SCHEDULE A
- ------------------------------------------------------------------------------------------------------------------------------------
                                                 PATENTS AND PATENT APPLICATIONS OF ASSIGNOR
- ------------------------------------------------------------------------------------------------------------------------------------
TITLE                             INVENTORS         ASSIGNEE           APPL. NO./            APPL. DATE/GRANT     STATUS
                                                                       PATENT NO.            DATE
- ------------------------------------------------------------------------------------------------------------------------------------
ISSUED U.S. PATENTS
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                               <C>                <C>                <C>                  <C>                   <C>
Method for the High Level         Blake, et al.      NVX                08/798,760           February 11, 1997     Notice of
Expression, Purification and                         (co-exclusive      (Notice of Allowance                       Allowance issued
Refolding of the Outer Membrane                      license with PMC)  issued Jan. 1999)                          January 1999
Group B Porin Proteins                                                                                             (fee paid April
                                                                                                                   1999)
- ------------------------------------------------------------------------------------------------------------------------------------
Method for the High Level         Blake, et al.      NVX & Rockefeller  5,439,808            August 8, 1995        Patent
Expression, Purification and                         University
Refolding of the Outer Membrane                      (co-exclusive
Group B Porin Proteins from                          license with PMC)
Neisseria Meningitidis
- ------------------------------------------------------------------------------------------------------------------------------------
Method for the High Level         Blake, et al.      NVX                5,747,287            May 5, 1998           Patent
Expression, Purification and                         (co-exclusive
Refolding of the Outer Membrane                      license with PMC)
Group B Porin Proteins from
Neisseria Meningitidis
- ------------------------------------------------------------------------------------------------------------------------------------
Group A Streptococcal             Blake et al.       NVX & Rockefeller  5,866,135            February 2, 1999      Patent
Polysaccharide Immunogenic                           University
Compositions and Methods
- ------------------------------------------------------------------------------------------------------------------------------------
Method for the High Level         Blake, et al.      NVX                5,879,686            March 9, 1999         Patent
Expression, Purification and                         (co-exclusive
Refolding of the Outer Membrane                      license with PMC)
Group B Porin Proteins from
Neisseria Meningitidis
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>

- ------------------------------------------------------------------------------------------------------------------------------------
U.S. PATENT APPLICATIONS
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                      <C>                     <C>           <C>                <C>                  <C>
Method for the High Level                Tai, et al.             NVX           08/096,181         July 23, 1993        Application
Expression, Purification and
Refolding of the Outer Membrane
Protein P2 from Haemophilus Type b
- ------------------------------------------------------------------------------------------------------------------------------------
Method for the High Level                Tai, et al.             NVX           08/449,358          May 24, 1995        Application
Expression, Purification and
Refolding of the Outer Membrane
Protein P2 from Haemophilus Type b
- ------------------------------------------------------------------------------------------------------------------------------------
Antigenic Group B Streptococcus         Michon, et al.           NVX           08/481,883          June 7, 1995        Application
Type II and Type III
Polysaccharide Fragments Having a
2,5-Anhydro-D-Mannose Terminal
Structure and Conjugate Vaccine
Thereof
- ------------------------------------------------------------------------------------------------------------------------------------
Direct Methods for Molar-Mass          Michon, D'Ambra           NVX           08/753,242       November 22, 1996      Application
Determination of Fragments of
Haemophilus Type b Capsular
Polysaccharides and Vaccine
Preparation
- ------------------------------------------------------------------------------------------------------------------------------------
Cloning of Non-IgA FC Binding             Tai, Blake             NVX           08/923,992       September 5, 1997      Application
Forms of the Group B Streptococcal
Beta Antigens
- ------------------------------------------------------------------------------------------------------------------------------------
Antigenic Group B Streptococcus         Michon, et al.           NVX           09/025,225       February 18, 1998      Application
Type II and Type III
Polysaccharide Fragments Having a
2,5-Anhydro-D-Mannose Terminal
Structure and Conjugate Vaccine
Thereof
- ------------------------------------------------------------------------------------------------------------------------------------

<PAGE>

- ------------------------------------------------------------------------------------------------------------------------------------
Immunogenic Conjugates Comprising       Blake, et al.            NVX           09/118/180         July 17, 1998        Application
A Group B Meningococcal Porin and
an H. Influenzae Polysaccharide
- ------------------------------------------------------------------------------------------------------------------------------------
Modified Immunogenic Pneumolysin       Minetti, et al.           NVX           09/120,044         July 21, 1998        Application
Compositions as Vaccines
- ------------------------------------------------------------------------------------------------------------------------------------
Group A Streptococcal                    Blake et al.           NVX &          09/207,188        December 8, 1998      Application
Polysaccharide Immunogenic                                   Rockefeller
Compositions and Methods                                     University
- ------------------------------------------------------------------------------------------------------------------------------------
Procedures for the Extraction and       Michon, Blake            NVX           09/221,620       December 23, 1998      Application
Isolation of Bacterial Capsular
Polysaccharides for Use as
Vaccines or Linked to Proteins as
Conjugate Vaccines
- ------------------------------------------------------------------------------------------------------------------------------------
Gram Positive Bacterial Antigens       Long-Rowe, Blake          NVX           09/399,220       September 17, 1999     Application
and Methods of Purification of the
Streptococcal C-Beta Protein
- ------------------------------------------------------------------------------------------------------------------------------------
Immunogenic Polysaccharide-Protein      Michon et al.            NVX           09/376,911        August 18, 1999       Application
Conjugate Useful as a Vaccine
Produced Via Conjugation Through a
CZ-3 N-Acyl Portion F A
Polysaccharide
- ------------------------------------------------------------------------------------------------------------------------------------

</TABLE>

                                      A-1.

<PAGE>
<TABLE>
<CAPTION>

- ---------------------------------------------------------------------------------------------------------------------------
                                                                 SCHEDULE B
- ---------------------------------------------------------------------------------------------------------------------------
                                                         U.S. TRADEMARKS OF ASSIGNOR
- ---------------------------------------------------------------------------------------------------------------------------
MARK                               STATUS              APPL NO./     APPL./REGIS. DATE        OWNER OF RECORD
                                                       REGIS. NO.
- ---------------------------------------------------------------------------------------------------------------------------
     REGISTERED U.S. TRADEMARKS
- ---------------------------------------------------------------------------------------------------------------------------
<S>                                <C>                 <C>           <C>                      <C>
Globe Design                       Registered          1,932,111     October 31, 1995         North American Vaccine, Inc.
- ---------------------------------------------------------------------------------------------------------------------------
AMVAX                              Registered          1,967,632     April 16, 1996           North American Vaccine, Inc.
- ---------------------------------------------------------------------------------------------------------------------------
TRINAVACEL                         Registered          2,101,121     September 30, 1997       American Vaccine Corporation
- ---------------------------------------------------------------------------------------------------------------------------
TRIVAX                             Registered          2,118,360     December 2, 1997         American Vaccine Corporation
- ---------------------------------------------------------------------------------------------------------------------------
NAVA                               Registered          2,267,812     August 3, 1999           American Vaccine Corporation
- ---------------------------------------------------------------------------------------------------------------------------
     PENDING U.S. TRADEMARK APPLICATIONS
- ---------------------------------------------------------------------------------------------------------------------------
THE IMPORTANCE OF OUR WORK         Pending             75/190,826    October 29, 1996         American Vaccine Corporation
GROWS BIGGER EVERY DAY
- ---------------------------------------------------------------------------------------------------------------------------
NEISVAC-C                          Pending             Not Avail.    August 26, 1999          American Vaccine Corporation
- ---------------------------------------------------------------------------------------------------------------------------
NEISIVA                            Pending             Not Avail.    August 26, 1999          American Vaccine Corporation
- ---------------------------------------------------------------------------------------------------------------------------
MENCIVA                            Pending             Not Avail.    August 26, 1999          American Vaccine Corporation
- ---------------------------------------------------------------------------------------------------------------------------
</TABLE>

                                      B-2

<PAGE>



                          SCHEDULE 4(C)(I) TO AGREEMENT
                            OUTSTANDING INDEBTEDNESS


                                     Annex B
                       Liabilities Greater than $1,000,000

Indenture  dated May 7, 1996 between NAV and Marine Midland Bank,  together with
related 6.5% Convertible Subordinated Notes.

Master Agreement dated November 1, 1996 between NAV and General Electric Capital
Corporation

Indenture  dated  November 12, 1998 by and between the Company and Bankers Trust
Company, as Trustee

<PAGE>



                         SCHEDULE 4(C)(II) TO AGREEMENT
                           LIENS AND NEGATIVE PLEDGES


                                Schedule 4(c)(ii)
                           Liens and Negative Pledges


Master Agreement dated November 1, 1996 between NAV and General Electric Capital
Corporation, including Security Agreement dated November 1, 1996.

Security and Pledge Agreement dated November 12, 1998 by and between the Company
and Bankers Trust Company, as trustee

Lease dated September 9, 1999 between Borrower and WRIT Limited Partnership

Lease dated February 19, 1999 between  Borrower and Newcourt  Financial USA Inc.
(capital lease for mass spectrometer)

Lease dated March 25, 1998 between Borrower and ARE-10150 Old Columbia LLC

Assignment of Deposit Account dated April 2, 1998 by Borrower to Chase Manhattan
Bank,  with Notice of  Assignment  and Notice of Letter of Credit dated April 3,
1998



November 1, 1999


North American Vaccine, Inc.
10150 Old Columbia Road
Columbia, Maryland  21046
Attention:  Dr. Randal Chase
            Chief Executive Officer and President


      Re:   $30,000,000 Senior Credit Facility


Dear Dr. Chase:

Bank of America,  N.A.  ("Bank of America")  is pleased to offer North  American
Vaccine,  Inc., a Canadian  corporation (the  "Borrower"),  a $30 million Senior
Secured Credit  Facility (the  "Facility").  Bank of America is pleased to offer
its  commitment  to lend up to $30  million,  upon and  subject to the terms and
conditions of this letter and the letter loan agreement dated  November 1, 1999
(the "Loan Agreement")  delivered by Bank of America and acknowledged and agreed
to by Borrower and Guarantor.

This letter is delivered to you in connection  with the Loan  Agreement.  Unless
otherwise  defined herein,  capitalized  terms shall have the meanings set forth
therein.  The  execution  and  delivery  of this  letter is a  condition  to the
effectiveness of the Loan Agreement. In connection with, and in consideration of
the agreements set forth in the Loan Agreement, the Borrower agrees with Bank of
America as follows:

      STRUCTURING FEE. At  Closing, the Borrower will pay a  structuring  fee of
      $25,000 to Bank of America for its own account.

By  acceptance  of this  letter,  the  Borrower  agrees  to pay  all  reasonable
out-of-pocket  fees  and  expenses  (including  reasonable  attorneys'  fees and
expenses and the allocated cost of internal  counsel)  incurred  before or after
the date hereof by us in connection  with the Facility;  provided that the legal
fees and expenses of internal  counsel at Bank of America in connection with the
Closing  of the  Facility  shall be covered by the  structuring  fee  referenced
above. The structuring fee payable above shall be fully-earned upon becoming due
and payable,  shall be non-refundable  for any reason whatsoever and shall be in
addition to any other fee, cost or expense payable pursuant to the Facility.






<PAGE>


North American Vaccine, Inc.
November 1, 1999
Page 2


The terms of this  letter  are  confidential  and,  except for  disclosure  on a
confidential  basis  to  your  accountants,  attorneys  and  other  professional
advisors  retained by you in connection  with the Facility or as may be required
by law,  may not be  disclosed in whole or in part to any other person or entity
without our prior written consent.









         [The remainder of this page has been intentionally left blank].






<PAGE>


North American Vaccine, Inc.
November 1, 1999
Page 3




Very truly yours,


BANK OF AMERICA, N.A.


By:     /s/ Lawrence J. Gordon
        ----------------------------------
Name:   Lawrence J. Gordon
Title:  Vice President


Accepted and Agreed to
as of November 1, 1999:



NORTH AMERICAN VACCINE, INC., as Borrower


By:    /s/ Randal Chase
       -----------------------------------
Name:  Randal Chase, Ph.D.
       -------------------
Title: Chief Executive Officer & President
       -----------------------------------



BAXTER INTERNATIONAL INC., as Guarantor


By:    /s/ Steven J. Meyer
       -----------------------------------
Name:  Steven J. Meyer
Title: Corp. Treasurer




                               SECURITY AGREEMENT

            THIS SECURITY AGREEMENT (this "Agreement"),  dated as of November 1,
1999,  is made between  NORTH  AMERICAN  VACCINE,  INC., a Canadian  corporation
("Debtor") and BANK OF AMERICA,  N.A., a national banking association  ("Secured
Party".)

            Debtor and Secured Party hereby agree as follows:

            SECTION 1 DEFINITIONS; INTERPRETATION.
                      ---------------------------

            (a) All  capitalized  terms used in this Agreement and not otherwise
defined  herein shall have the meanings  assigned to them in the Loan  Agreement
(as defined below.)

            (b) As used in this  Agreement,  the following  terms shall have the
following meanings:

            "COLLATERAL" has the meaning set forth in Section 2.

            "DOCUMENTS" means   the  Loan  Agreement  and all  other  documents,
agreements and instruments delivered to Secured Party in connection therewith or
with the Obligations.

            "EVENT OF DEFAULT" has the meaning set forth in Section 8.

            "LIEN" means any mortgage, deed of trust, pledge, security interest,
assignment,  deposit arrangement,  charge or encumbrance, lien, or other type of
preferential arrangement.

            "LOAN  AGREEMENT" means  the letter loan agreement dated November 1,
1999,  between  Secured  Party and Debtor,  pursuant to which  Secured Party has
agreed to make certain revolving loans to Debtor.

            "OBLIGATIONS" means    the   indebtedness,   liabilities  and  other
obligations  of  Debtor  to  Secured  Party  under or in  connection  with  this
Agreement and the other Documents,  including,  without limitation,  all amounts
owing under the Loan  Agreement  and all fees and all other  amounts  payable by
Debtor to Secured  Party  thereunder  or in  connection  therewith,  whether now
existing or  hereafter  arising,  and whether due or to become due,  absolute or
contingent, liquidated or unliquidated, determined or undetermined.

            "PERMITTED LIEN" means (i) any Lien in favor of Secured Party;  (ii)
any Lien  that is  subordinate  to the Lien on the  Collateral  created  by this
Agreement;  (iii) any Lien in favor of Baxter  International,  Inc.  under  that
certain  reimbursement  agreement  dated as of November 1, 1999;  (iv) any Liens
existing as of the date hereof and disclosed in writing to Secured Party.



<PAGE>


            "PERSON" means  an  individual,   corporation,   partnership,  joint
venture, trust, unincorporated  organization,  governmental agency or authority,
or any other entity of whatever nature.

            "UCC" means the Uniform  Commercial  Code as the same may, from time
to time, be in effect in the State of New York; PROVIDED,  HOWEVER, in the event
that, by reason of mandatory  provisions  of law, any or all of the  attachment,
perfection or priority of the security interest in any Collateral is governed by
the Uniform  Commercial Code as in effect in a jurisdiction other than the State
of New York, the term "UCC" shall mean the Uniform  Commercial Code as in effect
in such other  jurisdiction  for purposes of the provisions  hereof  relating to
such attachment,  perfection or priority and for purposes of definitions related
to such provisions.

            (c) Where applicable and except as otherwise  defined herein,  terms
used in this Agreement shall have the meanings assigned to them in the UCC.

            (d) In this  Agreement,  (i) the  meaning of defined  terms shall be
equally  applicable to both the singular and plural forms of the terms  defined;
and (ii) the captions and headings  are for  convenience  of reference  only and
shall not affect the construction of this Agreement.

            SECTION 2 SECURITY INTEREST.

            (a) As security for the payment and performance of the  Obligations,
Debtor hereby pledges, assigns, transfers, hypothecates and sets over to Secured
Party,  and  hereby  grants to  Secured  Party a  security  interest  in, all of
Debtor's  right,  title and  interest in, to and under the  following  property,
wherever  located  and whether now  existing or owned or  hereafter  acquired or
arising (collectively, the "Collateral"):

            (i)    all accounts,  accounts receivable,  contract rights,  rights
to payment, chattel paper, letters of credit, documents,  securities,  money and
instruments,  and  investment  property,  whether  held  directly  or  through a
securities  intermediary,  and other  obligations  of any kind  owed to  Debtor,
however evidenced;

            (ii)   all deposits and deposit  accounts  with  any  bank,  savings
and loan  association,  credit  union or like  organization,  and all  funds and
amounts therein, and whether or not held in trust, or in custody or safekeeping,
or otherwise restricted or designated for a particular purpose;

            (iii)  all inventory,  including, without limitation, all materials,
raw materials, parts, components, work in progress, finished goods, merchandise,
supplies,  and all  other  goods  which  are  held  for  sale,  lease  or  other
disposition  or  furnished  under  contracts  of service or consumed in Debtor's
business, including, without limitation, those held for display or demonstration
or out on lease or consignment;

            (iv)   all equipment,  including, without limitation, all machinery,
furniture,  furnishings,  fixtures,  trade fixtures,  tools, parts and supplies,
automobiles, trucks, tractors and other vehicles, appliances, computer and other


                                       2.
<PAGE>


electronic  data  processing  equipment  and other  office  equipment,  computer
programs and related data processing software, and all additions, substitutions,
replacements,  parts,  accessories,  and  accessions  to and for the  foregoing;
excluding,  however,  the  equipment  collateral  identified  in the  agreements
referred to in Schedule 4(c)(ii) of the Loan Agreement;

            (v)    all  general  intangibles  and  other  personal  property  of
Debtor, including, without limitation, (A) all tax and other refunds, rebates or
credits of every kind and nature to which Debtor is now or hereafter  may become
entitled;  (B) all  intellectual  property and all rights therein of any type or
description,  including,  without  limitation,  all inventions and  discoveries,
patents and patent  applications,  copyrights  and  applications  for  copyright
(together with the underlying  works of authorship)  whether or not  registered,
together with any renewals and extensions thereof, trademarks, service marks and
trade names, and applications for registration of such trademarks, service marks
and trade names, trade secrets,  trade dress, trade styles,  logos, other source
of  business  identifiers,   mask-works,   mask-work  registrations,   mask-work
applications,  software,  confidential  and  proprietary  information,  customer
lists, other license rights, advertising materials,  operating manuals, methods,
processes,   know-how,   algorithms,   formulae,   databases,   quality  control
procedures, product, service and technical specifications, operating, production
and quality control manuals, sales literature,  drawings,  specifications,  blue
prints,  descriptions,  inventions,  name  plates and  catalogs,  and the entire
goodwill of or  associated  with the  businesses  now or hereafter  conducted by
Debtor connected with and symbolized by any of the aforementioned properties and
assets,  and all  licenses  relating to any of the  foregoing,  all  reissuance,
continuations  and  continuations-in-part  of the  foregoing,  all other  rights
derived from or associated  with the  foregoing,  including the right to sue and
recover  for past  infringement,  and all  income  and  royalties  with  respect
thereto;  (C) all good will,  choses in action  and  causes of  action;  (D) all
interests in limited and general  partnerships and limited liability  companies;
and (E) all indemnity  agreements,  guaranties,  insurance  policies,  insurance
claims,  and other  contractual,  equitable and legal rights of whatever kind or
nature;

            (vi)   all books, records  and other  written,  electronic  or other
documentation  in whatever form  maintained by or for Debtor in connection  with
the  ownership  of the assets  described in this Section 2 or the conduct of its
business or evidencing or containing information relating to the Collateral; and

            (vii)  all products and proceeds, including insurance  proceeds,  of
any and all of the foregoing.

            (b) Anything  herein to  the  contrary  notwithstanding,  (i) Debtor
shall remain liable under any contracts, agreements and other documents included
in the Collateral, to the extent set forth therein, to perform all of its duties
and obligations  thereunder to the same extent as if this Agreement had not been
executed,  (ii) the  exercise  by Secured  Party of any of the rights  hereunder
shall not  release  Debtor  from any of its  duties or  obligations  under  such
contracts,  agreements and other documents included in the Collateral, and (iii)
Secured Party shall not have any  obligation or liability  under any  contracts,
agreements  and other  documents  included in the  Collateral  by reason of this
Agreement,  nor  shall  Secured  Party  be  obligated  to  perform  any  of  the
obligations  or duties of Debtor  thereunder or to take any action to collect or
enforce  any  such  contract,  agreement  or  other  document  included  in  the
Collateral hereunder.


                                       3.
<PAGE>


            (c) Notwithstanding the foregoing  provisions of this Section 2, the
grant of a security  interest  as provided  herein  shall not extend to, and the
term "Collateral" shall not include,  (1) that certain U.S. Patent No. 5,425,946
which is covered by a security  interest  in favor of Bankers  Trust  Company as
evidenced by the filing in the U.S.  Patent and Trademark  Office (the "Excluded
Patent Collateral"), and (2) any general intangibles of Debtor (whether owned or
held as licensee or lessee,  or otherwise),  to the extent that (i) such general
intangibles are not assignable or capable of being encumbered as a matter of law
or under the terms of the license,  lease or other agreement  applicable thereto
(but solely to the extent that any such restriction  shall be enforceable  under
applicable law),  without the consent of the licensor or lessor thereof or other
applicable party thereto and (ii) such consent has not been obtained;  PROVIDED,
HOWEVER,  that the foregoing grant of security interest shall extend to, and the
term "Collateral" shall include,  (A) any general intangible which is an account
receivable  or a  proceed  of,  or  otherwise  related  to  the  enforcement  or
collection  of, any  account  receivable,  or goods which are the subject of any
account  receivable,  (B) any and all proceeds of any general  intangibles which
are otherwise  excluded to the extent that the assignment or encumbrance of such
proceeds is not so  restricted,  and (C) upon  obtaining the consent of any such
licensor,  lessor or other  applicable  party's consent with respect to any such
otherwise excluded general intangibles,  such general intangibles as well as any
and all proceeds  thereof that might have  theretofore  have been  excluded from
such grant of a security interest and the term "Collateral."

            (d) This Agreement  shall create a continuing  security  interest in
the Collateral  which shall remain in effect until terminated in accordance with
Section 19 hereof.

            SECTION 3  FINANCING  STATEMENTS,  ETC.  Debtor  shall  execute  and
deliver to Secured Party concurrently with the execution of this Agreement,  and
at any  time  and  from  time  to time  thereafter,  all  financing  statements,
assignments,  continuation financing statements, termination statements, account
control  agreements,  and other  documents and  instruments,  in form reasonably
satisfactory to Secured Party,  and take all other action,  as Secured Party may
reasonably request, to perfect and continue perfected,  maintain the priority of
or provide  notice of the security  interest of Secured Party in the  Collateral
and to accomplish the purposes of this Agreement.

            SECTION 4  REPRESENTATIONS  AND  WARRANTIES.  Debtor  represents and
warrants to Secured Party that:

            (a) Debtor is a corporation duly organized,  validly existing and in
good standing under the law of the jurisdiction of its incorporation and has all
requisite  power and authority to execute,  deliver and perform its  obligations
under this Agreement.

            (b) The  execution,  delivery  and  performance  by  Debtor  of this
Agreement have been duly authorized by all necessary corporate action of Debtor,
and this  Agreement  constitutes  the legal,  valid and  binding  obligation  of
Debtor,  enforceable against Debtor in accordance with its terms, except in each
case  as  such   enforceability   may  be  limited  by  bankruptcy,   insolvency
reorganization,  liquidation,  moratorium  or  other  similar  laws  of  general
application and equitable principles relating to or affecting creditors' rights.


                                       4.
<PAGE>


            (c) Except as  otherwise  disclosed  in writing by Debtor to Secured
Party, no authorization,  consent, approval, license, exemption of, or filing or
registration with, any governmental  authority or agency, or approval or consent
of any other Person, is required for the due execution,  delivery or performance
by Debtor of this Agreement.

            (d) Debtor's chief executive  office and principal place of business
is located at the address set forth in  SCHEDULE  1; all other  locations  where
Debtor conducts business or Collateral is kept are set forth in SCHEDULE 1.

            (e) Except as  otherwise  disclosed  in writing by Debtor to Secured
Party,  Debtor is the sole and complete owner of the  Collateral,  free from any
Lien other than Permitted Liens.

            (f) Other than the Excluded Patent Collateral,  all of Debtor's U.S.
and  foreign  patents  and  patent  applications,  copyrights  (whether  or  not
registered),  applications  for copyright,  trademarks,  service marks and trade
names (whether registered or unregistered), and applications for registration of
such trademarks, service marks and trade names, are set forth in SCHEDULE 2.

            SECTION 5  COVENANTS.  So  long  as any  of the  Obligations  remain
unsatisfied, Debtor agrees that:

            (a) Debtor shall appear in and defend any action, suit or proceeding
which may affect to a material  extent its title to, or right or interest in, or
Secured Party's right or interest in, the  Collateral,  and shall do and perform
all reasonable acts that may be necessary and appropriate to maintain,  preserve
and protect the Collateral.

            (b) Debtor  shall  comply in all  material  respects  with all laws,
regulations  and  ordinances,  and all  policies  of  insurance,  relating  in a
material  way to the  possession,  operation,  maintenance  and  control  of the
Collateral.

            (c) Debtor shall give prompt written notice to Secured Party (and in
any event not later than 30 days  following any change  described  below in this
subsection)  of: (i) any change in the  location  of  Debtor's  chief  executive
office or principal  place of  business,  (ii) any change in the  locations  set
forth in  Schedule  1;  (iii)  any  change  in its name,  (iv) any  changes  in,
additions  to or other  modifications  of its trade  names and trade  styles set
forth in  Schedule  1 or  Schedule  2, and (v) any  changes in its  identity  or
structure in any manner which might make any financing statement filed hereunder
incorrect or misleading.

            (d) Debtor shall keep  separate,  accurate  and  complete  books and
records with respect to the  Collateral,  disclosing  Secured  Party's  security
interest hereunder.

            (e) Except as  otherwise  disclosed  in writing by Debtor to Secured
Party,  Debtor shall not surrender or lose  possession of (other than to Secured
Party),  sell,  lease,  rent,  or  otherwise  dispose of or transfer  any of the
Collateral or any right or interest  therein,  except in the ordinary  course of
business; PROVIDED that no such disposition or transfer of Collateral consisting
of  investment  property or  instruments  shall be permitted  while any Event of
Default exists.

            (f) Debtor  shall  keep the  Collateral  free  of all  Liens  except
Permitted Liens.


                                       5.
<PAGE>


            (g) Debtor shall pay and discharge all taxes, fees,  assessments and
governmental  charges or levies  imposed upon it with respect to the  Collateral
prior to the date on which penalties  attach thereto,  except to the extent such
taxes, fees,  assessments or governmental  charges or levies are being contested
in good faith by appropriate proceedings.

            (h) Debtor shall maintain and preserve its corporate existence,  its
rights to transact  business and all other  rights,  franchises  and  privileges
necessary or desirable in the normal course of its business and  operations  and
the  ownership of the  Collateral,  except in connection  with any  transactions
expressly permitted by the Documents.

            (i) Upon the request of Secured Party,  Debtor shall (i) immediately
deliver to Secured Party, or an agent designated by it,  appropriately  endorsed
or  accompanied  by  appropriate  instruments  of  transfer or  assignment,  all
documents  and  instruments,  all  certificated  securities  with respect to any
investment property,  all letters of credit and all accounts and other rights to
payment at any time evidenced by promissory  notes,  trade  acceptances or other
instruments,  (ii) cause any  securities  intermediaries  to show on their books
that Secured  Party is the  entitlement  holder with  respect to any  investment
property,  and/or obtain  account  control  agreements in favor of Secured Party
from such  securities  intermediaries,  in form and  substance  satisfactory  to
Secured Party, with respect to any investment property,  as requested by Secured
Party,  (iii) mark all  documents and chattel paper with such legends as Secured
Party shall  reasonably  specify,  and (iv) obtain  consents  from any letter of
credit  issuers with respect to the assignment to Secured Party of any letter of
credit proceeds.

            (j) Debtor shall at any reasonable time and from time to time permit
Secured Party or any of its agents or  representatives  to visit the premises of
Debtor  and  inspect  the  Collateral  and to  examine  and make  copies  of and
abstracts from the records and books of account of Debtor.

            (k) Debtor  shall:  (i) with such  frequency  as  Secured  Party may
require,  furnish to Secured Party such lists of customers and other information
relating  to the  accounts  and other  rights to payment as Secured  Party shall
reasonably request;  (ii) give only normal discounts,  allowances and credits as
to accounts  and other rights to payment,  in the  ordinary  course of business,
according to normal trade practices utilized by Debtor, and enforce all accounts
and other rights to payment strictly in accordance with their terms, except that
Debtor  may  grant  any  extension  of the time for  payment  or enter  into any
agreement  to make a rebate or  otherwise  to reduce the amount owing on or with
respect to, or compromise or settle for less than the full amount  thereof,  any
account or other right to payment, in the ordinary course of business, according
to normal and prudent  trade  practices  utilized by Debtor;  and (iii) upon the
request of Secured Party (A) at any time,  notify all or any designated  portion
of the account  debtors and other  obligors on the  accounts and other rights to
payment of the security  interest  hereunder,  and (B) upon the  occurrence  and
during the  continuance of an Event of Default,  notify the account  debtors and
other  obligors on the accounts  and other  rights to payment or any  designated
portion  thereof that payment shall be made directly to Secured Party or to such
other Person or location as Secured Party shall specify.


                                       6.
<PAGE>


            (l) Debtor shall (i) notify Secured Party of any material claim made
or  asserted  against  the  Collateral  by any  Person  and of any change in the
composition  of the Collateral or other event which could  materially  adversely
affect the value of the Collateral or Secured Party's Lien thereon; (ii) furnish
to  Secured  Party  such  statements  and  schedules  further   identifying  and
describing  the  Collateral  and such other  reports  and other  information  in
connection with the Collateral as Secured Party may reasonably  request,  all in
reasonable  detail; and (iii) upon reasonable request of Secured Party make such
demands and requests for  information  and reports as Debtor is entitled to make
in respect of the Collateral.

            (m) If and when  Debtor  shall  obtain  rights  to any new  patents,
trademarks,  service marks,  trade names or copyrights,  or otherwise acquire or
become  entitled  to the benefit  of, or apply for  registration  of, any of the
foregoing,  Debtor (i) shall  promptly  notify  Secured  Party  thereof and (ii)
hereby authorizes Secured Party to modify,  amend, or supplement  SCHEDULE 2 and
from time to time to include  any of the  foregoing  and make all  necessary  or
appropriate filings with respect thereto.

            (n) Debtor shall not enter into any agreement (including any license
or royalty agreement) pertaining to any of its patents, copyrights,  trademarks,
service marks and trade names, except for non-exclusive licenses in the ordinary
course of business.

            (o) Debtor  shall   give  Secured  Party  immediate  notice  of  the
establishment  of any new deposit  account and any new  securities  account with
respect to any investment property.

            SECTION 6  COLLECTION OF ACCOUNTS.  Until  Secured  Party  exercises
its rights hereunder to collect the accounts and other rights to payment, Debtor
shall endeavor in the first instance diligently to collect all amounts due or to
become due on or with respect to the  accounts  and other rights to payment.  At
the request of Secured Party,  upon the occurrence and during the continuance of
any Event of Default,  all remittances received by Debtor shall be held in trust
for Secured Party and, in accordance with Secured Party's instructions, remitted
to  Secured  Party or  deposited  to an  account  of  Secured  Party in the form
received  (with any  necessary  endorsements  or  instruments  of  assignment or
transfer). At the request of Secured Party, upon and after the occurrence of any
Event of Default,  Secured Party shall be entitled to receive all  distributions
and  payments  of  any  nature  with  respect  to  any  investment  property  or
instruments, and all such distributions or payments received by the Debtor shall
be held in trust for  Secured  Party and, in  accordance  with  Secured  Party's
instructions,  remitted to Secured Party or deposited to an account with Secured
Party in the form received  (with any necessary  endorsements  or instruments of
assignment  or transfer).  Following  the  occurrence of an Event of Default any
such distributions and payments with respect to any investment  property held in
any securities account shall be held and retained in such securities account, in
each case as part of the Collateral hereunder. Additionally, Secured Party shall
have the right,  upon the  occurrence  of an Event of Default,  following  prior
written notice to the Debtor,  to vote and to give consents,  ratifications  and
waivers with respect to any investment property and instruments, and to exercise
all rights of conversion, exchange, subscription or any other rights, privileges
or options  pertaining  thereto,  as if Secured  Party were the  absolute  owner
thereof;  PROVIDED  that Secured Party shall have no duty to exercise any of the
foregoing  rights  afforded to it and shall not be  responsible to the Debtor or
any other Person for any failure to do so or delay in doing so.


                                       7.
<PAGE>


            SECTION 7  AUTHORIZATION;  SECURED PARTY APPOINTED ATTORNEY-IN-FACT.
Secured Party shall have the right to, in the name of Debtor,  or in the name of
Secured Party or otherwise, upon notice to but without the requirement of assent
by Debtor,  and Debtor hereby constitutes and appoints Secured Party (and any of
Secured Party's  officers,  employees or agents  designated by Secured Party) as
Debtor's true and lawful attorney-in-fact, with full power and authority to: (i)
sign any of the financing  statements and other documents and instruments  which
must be  executed  or filed to  perfect  or  continue  perfected,  maintain  the
priority  of or  provide  notice of Secured  Party's  security  interest  in the
Collateral   (including  any  notices  to  or  agreements  with  any  securities
intermediary);  (ii) assert,  adjust, sue for,  compromise or release any claims
under any  policies  of  insurance;  and (iii)  execute  any and all such  other
documents and instruments,  and do any and all acts and things for and on behalf
of Debtor,  which  Secured Party may deem  reasonably  necessary or advisable to
maintain,  protect, realize upon and preserve the Collateral and Secured Party's
security  interest  therein and to  accomplish  the purposes of this  Agreement.
Secured Party agrees that, except upon and during the continuance of an Event of
Default,  it shall not exercise the power of attorney,  or any rights granted to
Secured  Party,  pursuant  to clauses  (ii) and (iii).  The  foregoing  power of
attorney is coupled with an interest and  irrevocable so long as the Obligations
have not been paid and performed in full. Debtor hereby ratifies,  to the extent
permitted by law, all that Secured Party shall  lawfully and in good faith do or
cause to be done by virtue of and in compliance with this Section 7.

            SECTION 8  EVENTS OF DEFAULT.  Any  of  the  following  events which
shall occur and be continuing shall constitute an "Event of Default":

            (a) Debtor shall fail to pay when due any amount  payable  hereunder
or under any other  Document  or in respect of the  Obligations  or an "Event of
Default" shall occur under the Loan Agreement.

            (b) Any  representation or warranty by Debtor under or in connection
with this Agreement any other Document shall prove to have been incorrect in any
material respect when made or deemed made.

            (c) Debtor shall fail to perform or observe in any material  respect
any other term,  covenant or  agreement  contained in this  Agreement,  the Loan
Agreement or any other  Document on its part to be performed or observed and any
such failure shall remain  unremedied for a period of 5 days from the occurrence
thereof;  or any "Event of Default" as defined in the Loan Agreement  shall have
occurred.

            (d) Any material  impairment  in the value of the  Collateral or the
priority of Secured Party's Lien hereunder.

            (e) Any levy upon, seizure or attachment of any of the Collateral.

            SECTION 9   REMEDIES.

            (a) Upon the  occurrence  and  continuance  of any Event of Default,
Secured  Party may  declare any of the  Obligations  to be  immediately  due and


                                       8.
<PAGE>


payable and shall have, in addition to all other rights and remedies  granted to
it in this Agreement or any other Document, all rights and remedies of a secured
party under the UCC and other applicable laws.

            (b) For the purpose of enabling Secured Party to exercise its rights
and  remedies  under  this  Section  9 or  otherwise  in  connection  with  this
Agreement,  Debtor hereby grants to Secured Party an irrevocable,  non-exclusive
and  assignable  license  (exercisable  without  payment  or  royalty  or  other
compensation to Debtor) to use, license or sublicense any intellectual  property
Collateral.

            (c) The  cash  proceeds  actually  received  from  the sale or other
disposition  or collection  of  Collateral,  and any other  amounts  received in
respect of the Collateral the application of which is not otherwise provided for
herein,  shall be applied  FIRST,  to the  payment of the  reasonable  costs and
expenses of Secured Party in exercising or enforcing its rights hereunder and in
collecting or attempting to collect any of the Collateral, and to the payment of
all other amounts  payable to Secured Party  pursuant to Section 13 hereof;  and
SECOND,  to the payment of the  Obligations.  Any surplus  thereof  which exists
after payment and performance in full of the Obligations  shall be promptly paid
over to Debtor or  otherwise  disposed  of in  accordance  with the UCC or other
applicable  law.  Debtor shall remain liable to Secured Party for any deficiency
which exists after any sale or other disposition or collection of Collateral.

            SECTION 10  CERTAIN  WAIVERS.  Debtor  waives, to the fullest extent
permitted by law, (i) any right of  redemption  with respect to the  Collateral,
whether before or after sale hereunder,  and all rights,  if any, of marshalling
of the Collateral or other collateral or security for the Obligations;  (ii) any
right to require Secured Party (A) to proceed against any Person, (B) to exhaust
any other collateral or security for any of the  Obligations,  (C) to pursue any
remedy  in  Secured  Party's  power,  or (D) to make or give  any  presentments,
demands  for  performance,  notices  of  nonperformance,  protests,  notices  of
protests or notices of dishonor in connection  with any of the  Collateral;  and
(iii) all claims,  damages, and demands against Secured Party arising out of the
repossession,  retention, sale or application of the proceeds of any sale of the
Collateral

            SECTION 11  NOTICES.  All notices or other communications  hereunder
shall be in writing  (including by facsimile  transmission) and mailed,  sent or
delivered to the respective  parties hereto at or to their respective  addresses
or facsimile  numbers set forth below their names on the signature pages hereof,
or at or to such other address or facsimile number as shall be designated by any
party in a written  notice to the other  parties  hereto.  All such  notices and
other  communications  shall  be  effective  (i)  if  delivered  by  hand,  when
delivered; (ii) if sent by mail, upon the earlier of the date of receipt or five
business days after deposit in the mail,  first class (or air mail, with respect
to communications to be sent to or from the United States); and (iii) if sent by
facsimile transmission, when sent.

            SECTION 12  NO WAIVER; CUMULATIVE REMEDIES.  No  failure on the part
of Secured Party to exercise,  and no delay in  exercising,  any right,  remedy,
power or privilege  hereunder shall operate as a waiver  thereof,  nor shall any
single  or  partial  exercise  of any such  right,  remedy,  power or  privilege
preclude  any other or further  exercise  thereof or the  exercise  of any other
right, remedy,


                                       9.
<PAGE>


power or privilege.  The rights and remedies under this Agreement are cumulative
and not  exclusive  of any  rights,  remedies,  powers and  privileges  that may
otherwise be available to Secured Party.

            SECTION 13 COSTS AND EXPENSES.

            (a) Subject to the terms of any other written fee agreement  between
Debtor and Secured Party or Guarantor, Debtor agrees to pay on demand:

            (i)    the   reasonable   out-of-pocket   costs   and   expenses  of
Secured Party,  and the reasonable fees and  disbursements of counsel to Secured
Party, in connection with the negotiation,  preparation, execution, delivery and
administration of this Agreement and the Note, and any amendments, modifications
or waivers of the terms thereof, and the custody of the Collateral;

            (ii)   all audit, consulting, search, recording,  filing and similar
costs,  fees and expenses  incurred or sustained by Secured  Party in connection
with this Agreement or the Collateral; and

            (iii)  all costs and  expenses of  Secured  Party,  and the fees and
disbursements  of counsel,  in  connection  with the  enforcement  or  attempted
enforcement  of,  and  preservation  of any  rights  or  interests  under,  this
Agreement and the Loan Agreement, including in any out-of-court workout or other
refinancing or restructuring or in any bankruptcy case, and the protection, sale
or collection of, or other realization upon, any of the Collateral.

            (b) Any amounts  payable to Secured  Party under this  Section 13 or
otherwise  under this Agreement if not paid upon demand shall bear interest from
the date of such demand until paid in full, at the default rate specified in the
Loan Agreement.

            SECTION 14  BINDING  EFFECT.  This Agreement  shall be binding upon,
inure to the benefit of and be  enforceable  by Debtor,  Secured Party and their
respective successors and assigns.

            SECTION 15  GOVERNING LAW. This Agreement  shall be governed by, and
construed  in  accordance  with,  the law of the  State of New  York,  except as
required  by  mandatory  provisions  of law and to the  extent the  validity  or
perfection of the security interests  hereunder,  or the remedies hereunder,  in
respect of any Collateral  are governed by the law of a jurisdiction  other than
New York.

            SECTION 16  ENTIRE AGREEMENT; AMENDMENT. This Agreement contains the
entire  agreement of the parties with respect to the subject  matter  hereof and
shall not be amended except by the written agreement of the parties.

            SECTION 17  SEVERABILITY.  Whenever possible, each provision of this
Agreement shall be interpreted in such manner as to be effective and valid under
all  applicable  laws  and  regulations.  If,  however,  any  provision  of this
Agreement  shall be prohibited by or invalid under any such law or regulation in
any  jurisdiction,  it shall,  as to such  jurisdiction,  be deemed  modified to


                                      10.
<PAGE>


conform to the minimum  requirements  of such law or regulation,  or, if for any
reason it is not deemed so modified, it shall be ineffective and invalid only to
the extent of such  prohibition  or invalidity  without  affecting the remaining
provisions of this Agreement, or the validity or effectiveness of such provision
in any other jurisdiction.

            SECTION 18  COUNTERPARTS.  This  Agreement  may be  executed  in any
number of counterparts and by different parties hereto in separate counterparts,
each of which  when so  executed  shall be deemed to be an  original  and all of
which taken together shall constitute but one and the same agreement.

            SECTION 19  TERMINATION.  Upon payment  and  performance  in full of
all Obligations, this Agreement shall terminate and Secured Party shall promptly
execute  and  deliver  to  Debtor  such  documents  and  instruments  reasonably
requested  by  Debtor  as shall be  necessary  to  evidence  termination  of all
security  interests  given by  Debtor  to  Secured  Party  hereunder;  PROVIDED,
HOWEVER,  that the  obligations  of Debtor under Section 13 hereof shall survive
such termination.


                                      11.
<PAGE>


      IN WITNESS WHEREOF,  the parties hereto have duly executed this Agreement,
as of the date first above written.


                                          NORTH AMERICAN VACCINE, INC.


                                          By: /s/ Lawrence J. Hineline
                                              ------------------------
                                             Title: Vice President Finance

                                          10150 Old Columbia Road
                                          Columbia, Maryland  21046
                                          Attn:  Vice President Finance
                                          Fax:   (410) 309-4077






                                          BANK OF AMERICA, N.A.


                                          By:  /s/ Lawrence J. Gordon
                                               -----------------------
                                             Title:  Vice President

                                          Bank of America Center
                                          700 Louisiana Street
                                          TX4-213-08-10
                                          Houston, Texas  77002-2700
                                          Attn:  Lawrence J. Gordon
                                          Fax:   (713) 247-6719






                                      12.
<PAGE>


                                   SCHEDULE 1
                            to the Security Agreement


1.    LOCATIONS OF CHIEF EXECUTIVE OFFICE AND OTHER LOCATIONS, INCLUDING OF
      COLLATERAL

      a.    Chief Executive Office and Principal Place of Business:


            North American Vaccine, Inc.
            10150 Old Columbia Road
            Columbia, Maryland 21046

      b. Other  locations  where Debtor  conducts  business or any Collateral is
         kept:

            North American Vaccine, Inc.
            9000 Virginia Manor Road
            Suite 290
            Beltsville, Maryland 20705

            North American Vaccine, Inc.
            12140 Indian Creek Court
            Beltsville, Maryland 20705

            AMVAX, Inc.
            12040 Indian Creek Court
            Beltsville, Maryland  20705

            American Vaccine Corporation
            1105 North Market Street, Suite 940
            Wilmington, Delaware 19801


1.    TRADE NAMES AND TRADE STYLES; OTHER CORPORATE, TRADE OR FICTITIOUS
      NAMES, ETC.

      See Schedule B attached hereto.



                                      S-1.
<PAGE>



                                   SCHEDULE 2
                            to the Security Agreement



1. PATENTS AND PATENT APPLICATIONS.


      See Schedule A attached hereto.



2. COPYRIGHTS (REGISTERED AND UNREGISTERED) AND COPYRIGHT APPLICATIONS.


      None.



3.  TRADEMARKS,  SERVICE MARKS AND TRADE NAMES AND  TRADEMARK,  SERVICE MARK AND
TRADE NAME APPLICATIONS.

      See Schedule B attached hereto.




                                      S-2.

<PAGE>

<TABLE>
<CAPTION>

- ------------------------------------------------------------------------------------------------------------------------------------
                                                                 SCHEDULE A
- ------------------------------------------------------------------------------------------------------------------------------------
                                                 PATENTS AND PATENT APPLICATIONS OF ASSIGNOR
- ------------------------------------------------------------------------------------------------------------------------------------
TITLE                             INVENTORS         ASSIGNEE           APPL. NO./            APPL. DATE/GRANT     STATUS
                                                                       PATENT NO.            DATE
- ------------------------------------------------------------------------------------------------------------------------------------
ISSUED U.S. PATENTS
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                               <C>                <C>                <C>                  <C>                   <C>
Method for the High Level         Blake, et al.      NVX                08/798,760           February 11, 1997     Notice of
Expression, Purification and                         (co-exclusive      (Notice of Allowance                       Allowance issued
Refolding of the Outer Membrane                      license with PMC)  issued Jan. 1999)                          January 1999
Group B Porin Proteins                                                                                             (fee paid April
                                                                                                                   1999)
- ------------------------------------------------------------------------------------------------------------------------------------
Method for the High Level         Blake, et al.      NVX & Rockefeller  5,439,808            August 8, 1995        Patent
Expression, Purification and                         University
Refolding of the Outer Membrane                      (co-exclusive
Group B Porin Proteins from                          license with PMC)
Neisseria Meningitidis
- ------------------------------------------------------------------------------------------------------------------------------------
Method for the High Level         Blake, et al.      NVX                5,747,287            May 5, 1998           Patent
Expression, Purification and                         (co-exclusive
Refolding of the Outer Membrane                      license with PMC)
Group B Porin Proteins from
Neisseria Meningitidis
- ------------------------------------------------------------------------------------------------------------------------------------
Group A Streptococcal             Blake et al.       NVX & Rockefeller  5,866,135            February 2, 1999      Patent
Polysaccharide Immunogenic                           University
Compositions and Methods
- ------------------------------------------------------------------------------------------------------------------------------------
Method for the High Level         Blake, et al.      NVX                5,879,686            March 9, 1999         Patent
Expression, Purification and                         (co-exclusive
Refolding of the Outer Membrane                      license with PMC)
Group B Porin Proteins from
Neisseria Meningitidis
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------------------------------------------------
U.S. PATENT APPLICATIONS
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                      <C>                     <C>           <C>                <C>                  <C>
Method for the High Level                Tai, et al.             NVX           08/096,181         July 23, 1993        Application
Expression, Purification and
Refolding of the Outer Membrane
Protein P2 from Haemophilus Type b
- ------------------------------------------------------------------------------------------------------------------------------------
Method for the High Level                Tai, et al.             NVX           08/449,358          May 24, 1995        Application
Expression, Purification and
Refolding of the Outer Membrane
Protein P2 from Haemophilus Type b
- ------------------------------------------------------------------------------------------------------------------------------------
Antigenic Group B Streptococcus         Michon, et al.           NVX           08/481,883          June 7, 1995        Application
Type II and Type III
Polysaccharide Fragments Having a
2,5-Anhydro-D-Mannose Terminal
Structure and Conjugate Vaccine
Thereof
- ------------------------------------------------------------------------------------------------------------------------------------
Direct Methods for Molar-Mass          Michon, D'Ambra           NVX           08/753,242       November 22, 1996      Application
Determination of Fragments of
Haemophilus Type b Capsular
Polysaccharides and Vaccine
Preparation
- ------------------------------------------------------------------------------------------------------------------------------------
Cloning of Non-IgA FC Binding             Tai, Blake             NVX           08/923,992       September 5, 1997      Application
Forms of the Group B Streptococcal
Beta Antigens
- ------------------------------------------------------------------------------------------------------------------------------------
Antigenic Group B Streptococcus         Michon, et al.           NVX           09/025,225       February 18, 1998      Application
Type II and Type III
Polysaccharide Fragments Having a
2,5-Anhydro-D-Mannose Terminal
Structure and Conjugate Vaccine
Thereof
- ------------------------------------------------------------------------------------------------------------------------------------

<PAGE>

- ------------------------------------------------------------------------------------------------------------------------------------
Immunogenic Conjugates Comprising       Blake, et al.            NVX           09/118/180         July 17, 1998        Application
A Group B Meningococcal Porin and
an H. Influenzae Polysaccharide
- ------------------------------------------------------------------------------------------------------------------------------------
Modified Immunogenic Pneumolysin       Minetti, et al.           NVX           09/120,044         July 21, 1998        Application
Compositions as Vaccines
- ------------------------------------------------------------------------------------------------------------------------------------
Group A Streptococcal                    Blake et al.           NVX &          09/207,188        December 8, 1998      Application
Polysaccharide Immunogenic                                   Rockefeller
Compositions and Methods                                     University
- ------------------------------------------------------------------------------------------------------------------------------------
Procedures for the Extraction and       Michon, Blake            NVX           09/221,620       December 23, 1998      Application
Isolation of Bacterial Capsular
Polysaccharides for Use as
Vaccines or Linked to Proteins as
Conjugate Vaccines
- ------------------------------------------------------------------------------------------------------------------------------------
Gram Positive Bacterial Antigens       Long-Rowe, Blake          NVX           09/399,220       September 17, 1999     Application
and Methods of Purification of the
Streptococcal C-Beta Protein
- ------------------------------------------------------------------------------------------------------------------------------------
Immunogenic Polysaccharide-Protein      Michon et al.            NVX           09/376,911        August 18, 1999       Application
Conjugate Useful as a Vaccine
Produced Via Conjugation Through a
CZ-3 N-Acyl Portion F A
Polysaccharide
- ------------------------------------------------------------------------------------------------------------------------------------

</TABLE>

                                      A-1.

<PAGE>

<TABLE>
<CAPTION>

- ---------------------------------------------------------------------------------------------------------------------------
                                                                 SCHEDULE B
- ---------------------------------------------------------------------------------------------------------------------------
                                                         U.S. TRADEMARKS OF ASSIGNOR
- ---------------------------------------------------------------------------------------------------------------------------
MARK                               STATUS              APPL NO./     APPL./REGIS. DATE        OWNER OF RECORD
                                                       REGIS. NO.
- ---------------------------------------------------------------------------------------------------------------------------
     REGISTERED U.S. TRADEMARKS
- ---------------------------------------------------------------------------------------------------------------------------
<S>                                <C>                 <C>           <C>                      <C>
Globe Design                       Registered          1,932,111     October 31, 1995         North American Vaccine, Inc.
- ---------------------------------------------------------------------------------------------------------------------------
AMVAX                              Registered          1,967,632     April 16, 1996           North American Vaccine, Inc.
- ---------------------------------------------------------------------------------------------------------------------------
TRINAVACEL                         Registered          2,101,121     September 30, 1997       American Vaccine Corporation
- ---------------------------------------------------------------------------------------------------------------------------
TRIVAX                             Registered          2,118,360     December 2, 1997         American Vaccine Corporation
- ---------------------------------------------------------------------------------------------------------------------------
NAVA                               Registered          2,267,812     August 3, 1999           American Vaccine Corporation
- ---------------------------------------------------------------------------------------------------------------------------
     PENDING U.S. TRADEMARK APPLICATIONS
- ---------------------------------------------------------------------------------------------------------------------------
THE IMPORTANCE OF OUR WORK         Pending             75/190,826    October 29, 1996         American Vaccine Corporation
GROWS BIGGER EVERY DAY
- ---------------------------------------------------------------------------------------------------------------------------
NEISVAC-C                          Pending             Not Avail.    August 26, 1999          American Vaccine Corporation
- ---------------------------------------------------------------------------------------------------------------------------
NEISIVA                            Pending             Not Avail.    August 26, 1999          American Vaccine Corporation
- ---------------------------------------------------------------------------------------------------------------------------
MENCIVA                            Pending             Not Avail.    August 26, 1999          American Vaccine Corporation
- ---------------------------------------------------------------------------------------------------------------------------
</TABLE>

                                       B-1




                               SECURITY AGREEMENT

            THIS SECURITY AGREEMENT (this "Agreement"),  dated as of November 1,
1999,  is made between  NORTH  AMERICAN  VACCINE,  INC., a Canadian  corporation
("Debtor")  and BAXTER  INTERNATIONAL,  INC., a Delaware  corporation  ("Secured
Party").

         Debtor and Secured Party hereby agree as follows:

         SECTION 1  DEFINITIONS; INTERPRETATION.

         (a) All  capitalized  terms used in this  Agreement  and not  otherwise
defined  herein  shall have the meanings  assigned to them in the  Reimbursement
Agreement.

         (b) As used in this  Agreement,  the  following  terms  shall  have the
following meanings:

         "BANK" means Bank of America, N.A.

         "LOAN  AGREEMENT"  means the loan  agreement  dated  November  1, 1999,
between  Bank and  Debtor,  pursuant  to which Bank has  agreed to make  certain
revolving loans to Debtor.

         "COLLATERAL" has the meaning set forth in Section 2.

         "DOCUMENTS" means the Reimbursement  Agreement and all other documents,
agreements and instruments delivered to Secured Party in connection therewith or
with the Obligations.

         "EVENT OF DEFAULT" has the meaning set forth in Section 8.

         "LIEN" means any mortgage,  deed of trust,  pledge,  security interest,
assignment,  deposit arrangement,  charge or encumbrance, lien, or other type of
preferential arrangement.

         "REIMBURSEMENT  AGREEMENT" means that certain  Reimbursement  Agreement
dated  November  1, 1999 made by Debtor in favor of Secured  Party,  as amended,
modified, renewed, extended or replaced from time to time.

         "OBLIGATIONS" means the indebtedness, liabilities and other obligations
of Debtor to Secured  Party under or in connection  with this  Agreement and the
other  Documents,  including,  without  limitation,  all amounts owing under the
Reimbursement  Agreement and all fees and all other amounts payable by Debtor to
Secured Party  thereunder or in  connection  therewith,  whether now existing or
hereafter  arising,  and whether due or to become due,  absolute or  contingent,
liquidated or unliquidated, determined or undetermined.


<PAGE>

         "PERMITTED LIEN" means (i) any Lien in favor of Secured Party; (ii) any
Lien  that  is  subordinate  to the  Lien  on the  Collateral  created  by  this
Agreement;  (iii) any Lien in favor of Bank of America,  N.A. under that certain
credit agreement dated as of November 1, 1999; (iv) any Liens existing as of the
date hereof and disclosed in writing to Secured Party.

         "PERSON" means an individual, corporation,  partnership, joint venture,
trust,  unincorporated  organization,  governmental agency or authority,  or any
other entity of whatever nature.

         "UCC" means the Uniform  Commercial  Code as the same may, from time to
time,  be in effect in the State of New York;  PROVIDED,  HOWEVER,  in the event
that, by reason of mandatory  provisions  of law, any or all of the  attachment,
perfection or priority of the security interest in any Collateral is governed by
the Uniform  Commercial Code as in effect in a jurisdiction other than the State
of New York, the term "UCC" shall mean the Uniform  Commercial Code as in effect
in such other  jurisdiction  for purposes of the provisions  hereof  relating to
such attachment,  perfection or priority and for purposes of definitions related
to such provisions.

         (c) Where applicable and except as otherwise defined herein, terms used
in this Agreement shall have the meanings assigned to them in the UCC.

         (d) In this  Agreement,  (i) the  meaning  of  defined  terms  shall be
equally  applicable to both the singular and plural forms of the terms  defined;
and (ii) the captions and headings  are for  convenience  of reference  only and
shall not affect the construction of this Agreement.

         SECTION 2  SECURITY INTEREST.

         (a) As security  for the payment and  performance  of the  Obligations,
Debtor hereby pledges, assigns, transfers, hypothecates and sets over to Secured
Party,  and  hereby  grants to  Secured  Party a  security  interest  in, all of
Debtor's  right,  title and  interest in, to and under the  following  property,
wherever  located  and whether now  existing or owned or  hereafter  acquired or
arising (collectively, the "Collateral"):

         (i)   all  accounts,  accounts  receivable, contract  rights, rights to
payment,  chattel paper,  letters of credit,  documents,  securities,  money and
instruments,  and  investment  property,  whether  held  directly  or  through a
securities  intermediary,  and other  obligations  of any kind  owed to  Debtor,
however evidenced;

         (ii)  all deposits and deposit accounts with any bank, savings and loan
association,  credit  union or like  organization,  and all  funds  and  amounts
therein,  and  whether or not held in trust,  or in custody or  safekeeping,  or
otherwise restricted or designated for a particular purpose;

         (iii) all inventory,  including, without limitation, all materials, raw
materials,  parts, components,  work in progress,  finished goods,  merchandise,
supplies,  and all  other  goods  which  are  held  for  sale,  lease  or  other
disposition  or  furnished  under  contracts  of service or consumed in Debtor's

                                       2.
<PAGE>

business, including, without limitation, those held for display or demonstration
or out on lease or consignment;

         (iv)  all equipment,  including,  without  limitation,  all  machinery,
furniture,  furnishings,  fixtures,  trade fixtures,  tools, parts and supplies,
automobiles, trucks, tractors and other vehicles, appliances, computer and other
electronic  data  processing  equipment  and other  office  equipment,  computer
programs and related data processing software, and all additions, substitutions,
replacements,  parts,  accessories,  and  accessions  to and for the  foregoing;
excluding,  however,  the  equipment  collateral  identified  in the  agreements
referred to in Schedule 4(c)(ii) of the Loan Agreement;

         (v)   all general  intangibles and other  personal  property of Debtor,
including, without limitation, (A) all tax and other refunds, rebates or credits
of every  kind and  nature  to  which  Debtor  is now or  hereafter  may  become
entitled;  (B) all  intellectual  property and all rights therein of any type or
description,  including,  without  limitation,  all inventions and  discoveries,
patents and patent  applications,  copyrights  and  applications  for  copyright
(together with the underlying  works of authorship)  whether or not  registered,
together with any renewals and extensions thereof, trademarks, service marks and
trade names, and applications for registration of such trademarks, service marks
and trade names, trade secrets,  trade dress, trade styles,  logos, other source
of  business  identifiers,   mask-works,   mask-work  registrations,   mask-work
applications,  software,  confidential  and  proprietary  information,  customer
lists, other license rights, advertising materials,  operating manuals, methods,
processes,   know-how,   algorithms,   formulae,   databases,   quality  control
procedures, product, service and technical specifications, operating, production
and quality control manuals, sales literature,  drawings,  specifications,  blue
prints,  descriptions,  inventions,  name  plates and  catalogs,  and the entire
goodwill of or  associated  with the  businesses  now or hereafter  conducted by
Debtor connected with and symbolized by any of the aforementioned properties and
assets,  and all  licenses  relating to any of the  foregoing,  all  reissuance,
continuations  and  continuations-in-part  of the  foregoing,  all other  rights
derived from or associated  with the  foregoing,  including the right to sue and
recover  for past  infringement,  and all  income  and  royalties  with  respect
thereto;  (C) all good will,  choses in action  and  causes of  action;  (D) all
interests in limited and general  partnerships and limited liability  companies;
and (E) all indemnity  agreements,  guaranties,  insurance  policies,  insurance
claims,  and other  contractual,  equitable and legal rights of whatever kind or
nature;

         (vi)  all  books,  records  and  other  written,  electronic  or  other
documentation  in whatever form  maintained by or for Debtor in connection  with
the  ownership  of the assets  described in this Section 2 or the conduct of its
business or evidencing or containing information relating to the Collateral; and

         (vii) all products and proceeds,  including insurance proceeds,  of any
and all of the foregoing.

         (b)   Anything herein to the contrary notwithstanding, (i) Debtor shall
remain liable under any contracts,  agreements and other  documents  included in
the  Collateral,  to the extent set forth therein,  to perform all of its duties
and obligations  thereunder to the same extent as if this Agreement had not been

                                       3.
<PAGE>

executed,  (ii) the  exercise  by Secured  Party of any of the rights  hereunder
shall not  release  Debtor  from any of its  duties or  obligations  under  such
contracts,  agreements and other documents included in the Collateral, and (iii)
Secured Party shall not have any  obligation or liability  under any  contracts,
agreements  and other  documents  included in the  Collateral  by reason of this
Agreement,  nor  shall  Secured  Party  be  obligated  to  perform  any  of  the
obligations  or duties of Debtor  thereunder or to take any action to collect or
enforce  any  such  contract,  agreement  or  other  document  included  in  the
Collateral hereunder.

         (c) Notwithstanding  the  foregoing  provisions of  this Section 2, the
grant of a security  interest  as provided  herein  shall not extend to, and the
term "Collateral" shall not include,  (1) that certain U.S. Patent No. 5,425,946
which is covered by a security  interest  in favor of Bankers  Trust  Company as
evidenced by the filing in the U.S.  Patent and Trademark  Office (the "Excluded
Patent Collateral"), and (2) any general intangibles of Debtor (whether owned or
held as licensee or lessee,  or otherwise),  to the extent that (i) such general
intangibles are not assignable or capable of being encumbered as a matter of law
or under the terms of the license,  lease or other agreement  applicable thereto
(but solely to the extent that any such restriction  shall be enforceable  under
applicable law),  without the consent of the licensor or lessor thereof or other
applicable party thereto and (ii) such consent has not been obtained;  PROVIDED,
HOWEVER,  that the foregoing grant of security interest shall extend to, and the
term "Collateral" shall include,  (A) any general intangible which is an account
receivable  or a  proceed  of,  or  otherwise  related  to  the  enforcement  or
collection  of, any  account  receivable,  or goods which are the subject of any
account  receivable,  (B) any and all proceeds of any general  intangibles which
are otherwise  excluded to the extent that the assignment or encumbrance of such
proceeds is not so  restricted,  and (C) upon  obtaining the consent of any such
licensor,  lessor or other  applicable  party's consent with respect to any such
otherwise excluded general intangibles,  such general intangibles as well as any
and all proceeds  thereof that might have  theretofore  have been  excluded from
such grant of a security interest and the term "Collateral."

         (d) This Agreement shall create a continuing  security  interest in the
Collateral  which shall remain in effect until  terminated  in  accordance  with
Section 19 hereof.

         SECTION 3  FINANCING STATEMENTS,  ETC. Debtor shall execute and deliver
to Secured Party  concurrently with the execution of this Agreement,  and at any
time and from time to time thereafter,  all financing  statements,  assignments,
continuation  financing  statements,  termination  statements,  account  control
agreements, and other documents and instruments, in form reasonably satisfactory
to Secured  Party,  and take all other action,  as Secured Party may  reasonably
request, to perfect and continue perfected,  maintain the priority of or provide
notice of the  security  interest  of  Secured  Party in the  Collateral  and to
accomplish the purposes of this Agreement.

         SECTION 4  REPRESENTATIONS  AND  WARRANTIES.   Debtor  represents  and
warrants to Secured Party that:


                                       4.
<PAGE>

         (a) Debtor is a corporation  duly  organized,  validly  existing and in
good standing under the law of the jurisdiction of its incorporation and has all
requisite  power and authority to execute,  deliver and perform its  obligations
under this Agreement.

         (b) The execution, delivery and performance by Debtor of this Agreement
have been duly authorized by all necessary  corporate action of Debtor, and this
Agreement  constitutes  the  legal,  valid and  binding  obligation  of  Debtor,
enforceable  against Debtor in accordance with its terms, except in each case as
such  enforceability  may be limited by bankruptcy,  insolvency  reorganization,
liquidation,  moratorium  or  other  similar  laws of  general  application  and
equitable principles relating to or affecting creditors' rights.

         (c) Except as  otherwise  disclosed  in  writing  by  Debtor to Secured
Party, no authorization,  consent, approval, license, exemption of, or filing or
registration with, any governmental  authority or agency, or approval or consent
of any other Person, is required for the due execution,  delivery or performance
by Debtor of this Agreement.

         (d) Debtor's chief executive  office and principal place of business is
located at the address set forth in SCHEDULE 1; all other locations where Debtor
conducts business or Collateral is kept are set forth in SCHEDULE 1.

         (e)  Except as  otherwise  disclosed  in  writing  by Debtor to Secured
Party,  Debtor is the sole and complete owner of the  Collateral,  free from any
Lien other than Permitted Liens.

         (f) Other than the Excluded  Patent,  Collateral;  all of Debtor's U.S.
and  foreign  patents  and  patent  applications,  copyrights  (whether  or  not
registered),  applications  for copyright,  trademarks,  service marks and trade
names (whether registered or unregistered), and applications for registration of
such trademarks, service marks and trade names, are set forth in SCHEDULE 2.

         SECTION 5 COVENANTS.  So  long   as  any   of  the  Obligations  remain
unsatisfied, Debtor agrees that:

         (a) Debtor  shall appear in and defend any action,  suit or  proceeding
which may affect to a material  extent its title to, or right or interest in, or
Secured Party's right or interest in, the  Collateral,  and shall do and perform
all reasonable acts that may be necessary and appropriate to maintain,  preserve
and protect the Collateral.

         (b) Debtor  shall  comply  in  all  material  respects  with all  laws,
regulations  and  ordinances,  and all  policies  of  insurance,  relating  in a
material  way to the  possession,  operation,  maintenance  and  control  of the
Collateral.

         (c) Debtor shall give prompt  written  notice to Secured  Party (and in
any event not later than 30 days  following any change  described  below in this
subsection)  of: (i) any change in the  location  of  Debtor's  chief  executive
office or principal  place of  business,  (ii) any change in the  locations  set
forth in  Schedule  1;  (iii)  any  change  in its name,  (iv) any  changes  in,
additions  to or other  modifications  of its trade  names and trade  styles set
forth in  Schedule  1 or  Schedule  2, and (v) any  changes in its  identity  or

                                       5.
<PAGE>

structure in any manner which might make any financing statement filed hereunder
incorrect or misleading.

         (d) Debtor shall keep separate, accurate and complete books and records
with respect to the Collateral,  disclosing  Secured Party's  security  interest
hereunder.

         (e) Debtor  shall not  surrender or lose  possession  of (other than to
Secured Party),  sell,  lease,  rent, or otherwise dispose of or transfer any of
the Collateral or any right or interest  therein,  except in the ordinary course
of  business;  PROVIDED  that no such  disposition  or  transfer  of  Collateral
consisting of investment  property or instruments  shall be permitted  while any
Event of Default exists.

         (f) Debtor shall keep the Collateral free of all Liens except Permitted
Liens.

         (g) Debtor shall pay and discharge  all taxes,  fees,  assessments  and
governmental  charges or levies  imposed upon it with respect to the  Collateral
prior to the date on which penalties  attach thereto,  except to the extent such
taxes, fees,  assessments or governmental  charges or levies are being contested
in good faith by appropriate proceedings.

         (h) Debtor shall  maintain and preserve its  corporate  existence,  its
rights to transact  business and all other  rights,  franchises  and  privileges
necessary or desirable in the normal course of its business and  operations  and
the  ownership of the  Collateral,  except in connection  with any  transactions
expressly permitted by the Documents.

         (i) Upon the request of Secured  Party,  Debtor  shall (i)  immediately
deliver to Secured Party, or an agent designated by it,  appropriately  endorsed
or  accompanied  by  appropriate  instruments  of  transfer or  assignment,  all
documents  and  instruments,  all  certificated  securities  with respect to any
investment property,  all letters of credit and all accounts and other rights to
payment at any time evidenced by promissory  notes,  trade  acceptances or other
instruments,  (ii) cause any  securities  intermediaries  to show on their books
that Secured  Party is the  entitlement  holder with  respect to any  investment
property,  and/or obtain  account  control  agreements in favor of Secured Party
from such  securities  intermediaries,  in form and  substance  satisfactory  to
Secured Party, with respect to any investment property,  as requested by Secured
Party,  (iii) mark all  documents and chattel paper with such legends as Secured
Party shall  reasonably  specify,  and (iv) obtain  consents  from any letter of
credit  issuers with respect to the assignment to Secured Party of any letter of
credit proceeds.

         (j) Debtor  shall at any  reasonable  time and from time to time permit
Secured Party or any of its agents or  representatives  to visit the premises of
Debtor  and  inspect  the  Collateral  and to  examine  and make  copies  of and
abstracts from the records and books of account of Debtor.

         (k) Debtor shall: (i) with such frequency as Secured Party may require,
furnish to Secured Party such lists of customers and other information  relating
to the accounts and other  rights to payment as Secured  Party shall  reasonably
request; (ii) give only normal discounts,  allowances and credits as to accounts


                                       6.
<PAGE>

and other rights to payment,  in the ordinary  course of business,  according to
normal trade  practices  utilized by Debtor,  and enforce all accounts and other
rights to payment  strictly in accordance  with their terms,  except that Debtor
may grant any  extension of the time for payment or enter into any  agreement to
make a rebate or  otherwise to reduce the amount owing on or with respect to, or
compromise or settle for less than the full amount thereof, any account or other
right to payment,  in the ordinary  course of business,  according to normal and
prudent  trade  practices  utilized  by Debtor;  and (iii)  upon the  request of
Secured  Party (A) at any time,  notify  all or any  designated  portion  of the
account  debtors and other  obligors on the accounts and other rights to payment
of the security interest  hereunder,  and (B) upon the occurrence and during the
continuance  of an Event of  Default,  notify  the  account  debtors  and  other
obligors on the accounts and other rights to payment or any  designated  portion
thereof that payment  shall be made  directly to Secured  Party or to such other
Person or location as Secured Party shall specify.

         (l) Debtor shall (i) notify Secured Party of any material claim made or
asserted  against  the  Collateral  by  any  Person  and of  any  change  in the
composition  of the Collateral or other event which could  materially  adversely
affect the value of the Collateral or Secured Party's Lien thereon; (ii) furnish
to  Secured  Party  such  statements  and  schedules  further   identifying  and
describing  the  Collateral  and such other  reports  and other  information  in
connection with the Collateral as Secured Party may reasonably  request,  all in
reasonable  detail; and (iii) upon reasonable request of Secured Party make such
demands and requests for  information  and reports as Debtor is entitled to make
in respect of the Collateral.

         (m) If and  when  Debtor  shall  obtain  rights  to  any  new  patents,
trademarks,  service marks,  trade names or copyrights,  or otherwise acquire or
become  entitled  to the benefit  of, or apply for  registration  of, any of the
foregoing,  Debtor (i) shall  promptly  notify  Secured  Party  thereof and (ii)
hereby authorizes Secured Party to modify,  amend, or supplement  SCHEDULE 2 and
from time to time to include  any of the  foregoing  and make all  necessary  or
appropriate filings with respect thereto.

         (n) Debtor shall not enter into any agreement (including any license or
royalty  agreement)  pertaining to any of its patents,  copyrights,  trademarks,
service marks and trade names, except for non-exclusive licenses in the ordinary
course of business.

         (o) Debtor  shall  give  Secured   Party   immediate   notice  of   the
establishment  of any new deposit  account and any new  securities  account with
respect to any investment property.

         SECTION 6  COLLECTION OF ACCOUNTS.  Until Secured  Party  exercises its
rights  hereunder to collect the  accounts  and other rights to payment,  Debtor
shall endeavor in the first instance diligently to collect all amounts due or to
become due on or with respect to the  accounts  and other rights to payment.  At
the request of Secured Party,  upon the occurrence and during the continuance of
any Event of Default,  all remittances received by Debtor shall be held in trust
for Secured Party and, in accordance with Secured Party's instructions, remitted
to  Secured  Party or  deposited  to an  account  of  Secured  Party in the form
received  (with any  necessary  endorsements  or  instruments  of  assignment or
transfer.) At the request of Secured Party, upon and after the occurrence of any
Event of Default,  Secured Party shall be entitled to receive all  distributions

                                       7.
<PAGE>

and  payments  of  any  nature  with  respect  to  any  investment  property  or
instruments, and all such distributions or payments received by the Debtor shall
be held in trust for  Secured  Party and, in  accordance  with  Secured  Party's
instructions,  remitted to Secured Party or deposited to an account with Secured
Party in the form received  (with any necessary  endorsements  or instruments of
assignment  or transfer.)  Following  the  occurrence of an Event of Default any
such distributions and payments with respect to any investment  property held in
any securities account shall be held and retained in such securities account, in
each case as part of the Collateral hereunder. Additionally, Secured Party shall
have the right,  upon the  occurrence  of an Event of Default,  following  prior
written notice to the Debtor,  to vote and to give consents,  ratifications  and
waivers with respect to any investment property and instruments, and to exercise
all rights of conversion, exchange, subscription or any other rights, privileges
or options  pertaining  thereto,  as if Secured  Party were the  absolute  owner
thereof;  PROVIDED  that Secured Party shall have no duty to exercise any of the
foregoing  rights  afforded to it and shall not be  responsible to the Debtor or
any other Person for any failure to do so or delay in doing so.

         SECTION 7  AUTHORIZATION;  SECURED  PARTY  APPOINTED  ATTORNEY-IN-FACT.
Secured Party shall have the right to, in the name of Debtor,  or in the name of
Secured Party or otherwise, upon notice to but without the requirement of assent
by Debtor,  and Debtor hereby constitutes and appoints Secured Party (and any of
Secured Party's  officers,  employees or agents  designated by Secured Party) as
Debtor's true and lawful attorney-in-fact, with full power and authority to: (i)
sign any of the financing  statements and other documents and instruments  which
must be  executed  or filed to  perfect  or  continue  perfected,  maintain  the
priority  of or  provide  notice of Secured  Party's  security  interest  in the
Collateral   (including  any  notices  to  or  agreements  with  any  securities
intermediary);  (ii) assert,  adjust, sue for,  compromise or release any claims
under any  policies  of  insurance;  and (iii)  execute  any and all such  other
documents and instruments,  and do any and all acts and things for and on behalf
of Debtor,  which  Secured Party may deem  reasonably  necessary or advisable to
maintain,  protect, realize upon and preserve the Collateral and Secured Party's
security  interest  therein and to  accomplish  the purposes of this  Agreement.
Secured Party agrees that, except upon and during the continuance of an Event of
Default,  it shall not exercise the power of attorney,  or any rights granted to
Secured  Party,  pursuant  to clauses  (ii) and (iii).  The  foregoing  power of
attorney is coupled with an interest and  irrevocable so long as the Obligations
have not been paid and performed in full. Debtor hereby ratifies,  to the extent
permitted by law, all that Secured Party shall  lawfully and in good faith do or
cause to be done by virtue of and in compliance with this Section 7.

         SECTION 8  EVENTS OF DEFAULT.  Any of the following  events which shall
occur and be continuing shall constitute an "Event of Default":

         (a) Debtor shall fail to pay when due any amount  payable  hereunder or
under the  Reimbursement  Agreement  or any other  Document or in respect of the
Obligations or an "Event of Default" shall occur under the Loan Agreement.

         (b) Any  representation  or warranty by Debtor  under or in  connection
with this Agreement any other Document shall prove to have been incorrect in any
material respect when made or deemed made.


                                       8.
<PAGE>

         (c) Debtor shall fail to perform or observe in any material respect any
other term, covenant or agreement contained in this Agreement, the Reimbursement
Agreement or any other  Document on its part to be performed or observed and any
such failure shall remain  unremedied for a period of 5 days from the occurrence
thereof.

         (d) Any  material  impairment  in the  value of the  Collateral  or the
priority of Secured Party's Lien hereunder.

         (e) Any levy upon, seizure or attachment of any of the Collateral.

         (h) Any Event of Default shall occur under the Bank Credit Agreement.

         SECTION 9  REMEDIES.

         (a) Upon  the  occurrence  and  continuance  of any  Event of  Default,
Secured  Party may  declare any of the  Obligations  to be  immediately  due and
payable and shall have, in addition to all other rights and remedies  granted to
it in this Agreement,  the  Reimbursement  Agreement or any other Document,  all
rights and remedies of a secured party under the UCC and other applicable laws.

         (b) For the purpose of enabling  Secured  Party to exercise  its rights
and  remedies  under  this  Section  9 or  otherwise  in  connection  with  this
Agreement,  Debtor hereby grants to Secured Party an irrevocable,  non-exclusive
and  assignable  license  (exercisable  without  payment  or  royalty  or  other
compensation to Debtor) to use, license or sublicense any intellectual  property
Collateral.

         (c) The  cash  proceeds  actually  received  from  the  sale  or  other
disposition  or collection  of  Collateral,  and any other  amounts  received in
respect of the Collateral the application of which is not otherwise provided for
herein,  shall be applied  FIRST,  to the  payment of the  reasonable  costs and
expenses of Secured Party in exercising or enforcing its rights hereunder and in
collecting or attempting to collect any of the Collateral, and to the payment of
all other amounts  payable to Secured Party  pursuant to Section 13 hereof;  and
SECOND,  to the payment of the  Obligations.  Any surplus  thereof  which exists
after payment and performance in full of the Obligations  shall be promptly paid
over to Debtor or  otherwise  disposed  of in  accordance  with the UCC or other
applicable  law.  Debtor shall remain liable to Secured Party for any deficiency
which exists after any sale or other disposition or collection of Collateral.

         SECTION 10  CERTAIN  WAIVERS.  Debtor  waives,  to the  fullest  extent
permitted by law, (i) any right of  redemption  with respect to the  Collateral,
whether before or after sale hereunder,  and all rights,  if any, of marshalling
of the Collateral or other collateral or security for the Obligations;  (ii) any
right to require Secured Party (A) to proceed against any Person, (B) to exhaust
any other collateral or security for any of the  Obligations,  (C) to pursue any
remedy  in  Secured  Party's  power,  or (D) to make or give  any  presentments,
demands  for  performance,  notices  of  nonperformance,  protests,  notices  of
protests or notices of dishonor in connection  with any of the  Collateral;  and
(iii) all claims,  damages, and demands against Secured Party arising out of the
repossession,  retention, sale or application of the proceeds of any sale of the
Collateral.


                                       9.
<PAGE>

         SECTION 11  NOTICES.  All  notices or  other  communications  hereunder
shall be in writing  (including by facsimile  transmission) and mailed,  sent or
delivered to the respective  parties hereto at or to their respective  addresses
or facsimile  numbers set forth below their names on the signature pages hereof,
or at or to such other address or facsimile number as shall be designated by any
party in a written  notice to the other  parties  hereto.  All such  notices and
other  communications  shall  be  effective  (i)  if  delivered  by  hand,  when
delivered; (ii) if sent by mail, upon the earlier of the date of receipt or five
business days after deposit in the mail, first class [(or air mail, with respect
to communications  to be sent to or from the United States)];  and (iii) if sent
by facsimile transmission, when sent.

         SECTION 12  NO WAIVER; CUMULATIVE  REMEDIES.  No failure on the part of
Secured Party to exercise, and no delay in exercising,  any right, remedy, power
or privilege  hereunder shall operate as a waiver thereof,  nor shall any single
or partial exercise of any such right,  remedy,  power or privilege preclude any
other or further  exercise  thereof or the exercise of any other right,  remedy,
power or privilege.  The rights and remedies under this Agreement are cumulative
and not  exclusive  of any  rights,  remedies,  powers and  privileges  that may
otherwise be available to Secured Party.

         SECTION 13  COSTS AND EXPENSES.

         (a)  Subject to the terms of any other  written fee  agreement  between
Debtor and Secured Party or Guarantor, Debtor agrees to pay on demand:

         (i) [Intentionally omitted];

         (ii) all audit,  consulting,  search,  recording,  filing  and  similar
costs,  fees and expenses  incurred or sustained by Secured  Party in connection
with this Agreement or the Collateral; and

         (iii)  all  costs  and  expenses  of  Secured  Party,  and the fees and
disbursements  of counsel,  in  connection  with the  enforcement  or  attempted
enforcement  of,  and  preservation  of any  rights  or  interests  under,  this
Agreement and the Reimbursement Agreement, including in any out-of-court workout
or  other  refinancing  or  restructuring  or in any  bankruptcy  case,  and the
protection,  sale or  collection  of,  or  other  realization  upon,  any of the
Collateral.

         (b) Any  amounts  payable to  Secured  Party  under this  Section 13 or
otherwise  under this Agreement if not paid upon demand shall bear interest from
the date of such demand until paid in full, at the default rate specified in the
Loan Agreement.

         SECTION 14 BINDING EFFECT.  This Agreement shall be binding upon, inure
to the  benefit  of and be  enforceable  by  Debtor,  Secured  Party  and  their
respective successors and assigns.

         SECTION 15 GOVERNING LAW.  This  Agreement  shall  be  governed by, and
construed  in  accordance  with,  the law of the  State of New  York,  except as
required  by  mandatory  provisions  of law and to the  extent the  validity  or

                                      10.
<PAGE>

perfection of the security interests  hereunder,  or the remedies hereunder,  in
respect of any Collateral  are governed by the law of a jurisdiction  other than
New York.

         SECTION 16  ENTIRE AGREEMENT;  AMENDMENT.  This Agreement  contains the
entire  agreement of the parties with respect to the subject  matter  hereof and
shall not be amended except by the written agreement of the parties.

         SECTION 17  SEVERABILITY.  Whenever possible,  each  provision  of this
Agreement shall be interpreted in such manner as to be effective and valid under
all  applicable  laws  and  regulations.  If,  however,  any  provision  of this
Agreement  shall be prohibited by or invalid under any such law or regulation in
any  jurisdiction,  it shall,  as to such  jurisdiction,  be deemed  modified to
conform to the minimum  requirements  of such law or regulation,  or, if for any
reason it is not deemed so modified, it shall be ineffective and invalid only to
the extent of such  prohibition  or invalidity  without  affecting the remaining
provisions of this Agreement, or the validity or effectiveness of such provision
in any other jurisdiction.

         SECTION 18  COUNTERPARTS.  This Agreement may be executed in any number
of counterparts and by different parties hereto in separate  counterparts,  each
of which when so  executed  shall be deemed to be an  original  and all of which
taken together shall constitute but one and the same agreement.

         SECTION 19  TERMINATION.  Upon payment and  performance  in full of all
Obligations,  this  Agreement  shall  terminate and Secured Party shall promptly
execute  and  deliver  to  Debtor  such  documents  and  instruments  reasonably
requested  by  Debtor  as shall be  necessary  to  evidence  termination  of all
security  interests  given by  Debtor  to  Secured  Party  hereunder;  PROVIDED,
HOWEVER,  that the  obligations  of Debtor under Section 13 hereof shall survive
such termination.


                                       11.
<PAGE>


         IN  WITNESS  WHEREOF,  the  parties  hereto  have  duly  executed  this
Agreement, as of the date first above written.


                                             NORTH AMERICAN VACCINE, INC.


                                             By: /s/ Lawrence J. Hineline
                                                 -------------------------------
                                                 Title: Vice President Finance

                                             10150 Old Columbia Road

                                             Columbia, Maryland  21046

                                             -----------------------------------


                                             Attn: Vice President

                                             Fax:  (410) 309-4077





                                          BAXTER INTERNATIONAL INC.


                                          By:  /s/ Steven J. Meyer
                                               -----------------------
                                               Title:  Corp. Treasurer




<PAGE>

                                   SCHEDULE 1
                            to the Security Agreement


1.  LOCATIONS  OF CHIEF  EXECUTIVE  OFFICE  AND OTHER  LOCATIONS,  INCLUDING  OF
    COLLATERAL

    a. Chief Executive Office and Principal Place of Business:

    North American Vaccine, Inc.
    10150 Old Columbia Road
    Columbia, Maryland 21046

    b. Other locations where Debtor conducts  business or any Collateral is
       kept:

    North American Vaccine, Inc.
    9000 Virginia Manor Road
    Suite 290
    Beltsville, Maryland 20705

    North American Vaccine, Inc.
    12140 Indian Creek Court
    Beltsville, Maryland 20705

    AMVAX, Inc.
    12040 Indian Creek Court
    Beltsville, Maryland  20705

    American Vaccine Corporation
    1105 North Market Street, Suite 940
    Wilmington, Delaware 19801

2.  TRADE NAMES AND TRADE STYLES; OTHER CORPORATE, TRADE OR FICTITIOUS NAMES,
    ETC.

    See Schedule B attached hereto.





                                      S-1.
<PAGE>


                                   SCHEDULE 2
                            to the Security Agreement



1. PATENTS AND PATENT APPLICATIONS.


         See Schedule A attached hereto.



2. COPYRIGHTS (REGISTERED AND UNREGISTERED) AND COPYRIGHT APPLICATIONS.


         None.



3. TRADEMARKS,  SERVICE MARKS AND TRADE NAMES AND  TRADEMARK,  SERVICE MARK AND
   TRADE NAME APPLICATIONS.



         See Schedule B attached hereto.




                                      S-2

<PAGE>

<TABLE>
<CAPTION>

- ------------------------------------------------------------------------------------------------------------------------------------
                                                                 SCHEDULE A
- ------------------------------------------------------------------------------------------------------------------------------------
                                                 PATENTS AND PATENT APPLICATIONS OF ASSIGNOR
- ------------------------------------------------------------------------------------------------------------------------------------
ISSUED U.S. PATENTS
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                               <C>                <C>                <C>                  <C>                   <C>
Method for the High Level         Blake, et al.      NVX                08/798,760           February 11, 1997     Notice of
Expression, Purification and                         (co-exclusive      (Notice of Allowance                       Allowance issued
Refolding of the Outer Membrane                      license with PMC)  issued Jan. 1999)                          January 1999
Group B Porin Proteins                                                                                             (fee paid April
                                                                                                                   1999)
- ------------------------------------------------------------------------------------------------------------------------------------
Method for the High Level         Blake, et al.      NVX & Rockefeller  5,439,808            August 8, 1995        Patent
Expression, Purification and                         University
Refolding of the Outer Membrane                      (co-exclusive
Group B Porin Proteins from                          license with PMC)
Neisseria Meningitidis
- ------------------------------------------------------------------------------------------------------------------------------------
Method for the High Level         Blake, et al.      NVX                5,747,287            May 5, 1998           Patent
Expression, Purification and                         (co-exclusive
Refolding of the Outer Membrane                      license with PMC)
Group B Porin Proteins from
Neisseria Meningitidis
- ------------------------------------------------------------------------------------------------------------------------------------
Group A Streptococcal             Blake et al.       NVX & Rockefeller  5,866,135            February 2, 1999      Patent
Polysaccharide Immunogenic                           University
Compositions and Methods
- ------------------------------------------------------------------------------------------------------------------------------------
Method for the High Level         Blake, et al.      NVX                5,879,686            March 9, 1999         Patent
Expression, Purification and                         (co-exclusive
Refolding of the Outer Membrane                      license with PMC)
Group B Porin Proteins from
Neisseria Meningitidis
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>

- ------------------------------------------------------------------------------------------------------------------------------------
U.S. PATENT APPLICATIONS
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                      <C>                     <C>           <C>                <C>                  <C>
Method for the High Level                Tai, et al.             NVX           08/096,181         July 23, 1993        Application
Expression, Purification and
Refolding of the Outer Membrane
Protein P2 from Haemophilus Type b
- ------------------------------------------------------------------------------------------------------------------------------------
Method for the High Level                Tai, et al.             NVX           08/449,358          May 24, 1995        Application
Expression, Purification and
Refolding of the Outer Membrane
Protein P2 from Haemophilus Type b
- ------------------------------------------------------------------------------------------------------------------------------------
Antigenic Group B Streptococcus         Michon, et al.           NVX           08/481,883          June 7, 1995        Application
Type II and Type III
Polysaccharide Fragments Having a
2,5-Anhydro-D-Mannose Terminal
Structure and Conjugate Vaccine
Thereof
- ------------------------------------------------------------------------------------------------------------------------------------
Direct Methods for Molar-Mass          Michon, D'Ambra           NVX           08/753,242       November 22, 1996      Application
Determination of Fragments of
Haemophilus Type b Capsular
Polysaccharides and Vaccine
Preparation
- ------------------------------------------------------------------------------------------------------------------------------------
Cloning of Non-IgA FC Binding             Tai, Blake             NVX           08/923,992       September 5, 1997      Application
Forms of the Group B Streptococcal
Beta Antigens
- ------------------------------------------------------------------------------------------------------------------------------------
Antigenic Group B Streptococcus         Michon, et al.           NVX           09/025,225       February 18, 1998      Application
Type II and Type III
Polysaccharide Fragments Having a
2,5-Anhydro-D-Mannose Terminal
Structure and Conjugate Vaccine
Thereof
- ------------------------------------------------------------------------------------------------------------------------------------

<PAGE>

- ------------------------------------------------------------------------------------------------------------------------------------
Immunogenic Conjugates Comprising       Blake, et al.            NVX           09/118/180         July 17, 1998        Application
A Group B Meningococcal Porin and
an H. Influenzae Polysaccharide
- ------------------------------------------------------------------------------------------------------------------------------------
Modified Immunogenic Pneumolysin       Minetti, et al.           NVX           09/120,044         July 21, 1998        Application
Compositions as Vaccines
- ------------------------------------------------------------------------------------------------------------------------------------
Group A Streptococcal                    Blake et al.           NVX &          09/207,188        December 8, 1998      Application
Polysaccharide Immunogenic                                   Rockefeller
Compositions and Methods                                     University
- ------------------------------------------------------------------------------------------------------------------------------------
Procedures for the Extraction and       Michon, Blake            NVX           09/221,620       December 23, 1998      Application
Isolation of Bacterial Capsular
Polysaccharides for Use as
Vaccines or Linked to Proteins as
Conjugate Vaccines
- ------------------------------------------------------------------------------------------------------------------------------------
Gram Positive Bacterial Antigens       Long-Rowe, Blake          NVX           09/399,220       September 17, 1999     Application
and Methods of Purification of the
Streptococcal C-Beta Protein
- ------------------------------------------------------------------------------------------------------------------------------------
Immunogenic Polysaccharide-Protein      Michon et al.            NVX           09/376,911        August 18, 1999       Application
Conjugate Useful as a Vaccine
Produced Via Conjugation Through a
CZ-3 N-Acyl Portion F A
Polysaccharide
- ------------------------------------------------------------------------------------------------------------------------------------

</TABLE>
                                       A-1

<PAGE>

<TABLE>
<CAPTION>

- ---------------------------------------------------------------------------------------------------------------------------
                                                                 SCHEDULE B
- ---------------------------------------------------------------------------------------------------------------------------
                                                         U.S. TRADEMARKS OF ASSIGNOR
- ---------------------------------------------------------------------------------------------------------------------------
MARK                               STATUS              APPL NO./     APPL./REGIS. DATE        OWNER OF RECORD
                                                       REGIS. NO.
- ---------------------------------------------------------------------------------------------------------------------------
     REGISTERED U.S. TRADEMARKS
- ---------------------------------------------------------------------------------------------------------------------------
<S>                                <C>                 <C>           <C>                      <C>
Globe Design                       Registered          1,932,111     October 31, 1995         North American Vaccine, Inc.
- ---------------------------------------------------------------------------------------------------------------------------
AMVAX                              Registered          1,967,632     April 16, 1996           North American Vaccine, Inc.
- ---------------------------------------------------------------------------------------------------------------------------
TRINAVACEL                         Registered          2,101,121     September 30, 1997       American Vaccine Corporation
- ---------------------------------------------------------------------------------------------------------------------------
TRIVAX                             Registered          2,118,360     December 2, 1997         American Vaccine Corporation
- ---------------------------------------------------------------------------------------------------------------------------
NAVA                               Registered          2,267,812     August 3, 1999           American Vaccine Corporation
- ---------------------------------------------------------------------------------------------------------------------------
     PENDING U.S. TRADEMARK APPLICATIONS
- ---------------------------------------------------------------------------------------------------------------------------
THE IMPORTANCE OF OUR WORK         Pending             75/190,826    October 29, 1996         American Vaccine Corporation
GROWS BIGGER EVERY DAY
- ---------------------------------------------------------------------------------------------------------------------------
NEISVAC-C                          Pending             Not Avail.    August 26, 1999          American Vaccine Corporation
- ---------------------------------------------------------------------------------------------------------------------------
NEISIVA                            Pending             Not Avail.    August 26, 1999          American Vaccine Corporation
- ---------------------------------------------------------------------------------------------------------------------------
MENCIVA                            Pending             Not Avail.    August 26, 1999          American Vaccine Corporation
- ---------------------------------------------------------------------------------------------------------------------------
</TABLE>

                                      B-2



             PATENT AND TRADEMARK ASSIGNMENT AND SECURITY AGREEMENT

            THIS PATENT AND TRADEMARK  ASSIGNMENT AND SECURITY  AGREEMENT  (this
"Agreement"),  dated as of  November 1, 1999,  is made  between  NORTH  AMERICAN
VACCINE,  INC., a Canadian corporation  ("Assignor"),  and BANK OF AMERICA, N.A.
("Assignee").

            Assignor and Assignee are parties to a Security  Agreement  dated as
of  November 1, 1999 (as  amended,  modified,  renewed or extended  from time to
time, the "Security Agreement"),  which Security Agreement provides, among other
things,  for the  assignment  by Assignor to Assignee,  and grant by Assignor to
Assignee of a security  interest in, certain of Assignor's  property and assets,
including,  without  limitation,  its  patents  and  patent  applications,   its
trademarks, service marks and trade names, and its applications for registration
of such  trademarks,  service  marks  and  trade  names.  Pursuant  to the  Loan
Agreement  Assignor has agreed to execute and deliver this Agreement to Assignee
for filing with the United States  Patent and Trademark  Office (the "PTO") (and
any other relevant  recording systems in any domestic or foreign  jurisdiction),
and as further  evidence of and to effectuate  such assignment of and grant of a
security interest in such patents and patent applications,  trademarks,  service
marks and trade names,  and  applications  for  registration of such trademarks,
service  marks and trade  names,  and the other  general  intangibles  described
herein. Accordingly, Assignor and Assignee hereby agree as follows:

            SECTION 1  DEFINITIONS; INTERPRETATION.

            (a) All  capitalized  terms used in this Agreement and not otherwise
defined  herein  shall  have  the  meanings  assigned  to them  in the  Security
Agreement.

            (b) In this  Agreement,  (i) the  meaning of defined  terms shall be
equally  applicable to both the singular and plural forms of the terms  defined;
and (ii) the captions and headings  are for  convenience  of reference  only and
shall not affect the construction of this Agreement.

            SECTION 2  ASSIGNMENT AND GRANT OF SECURITY INTEREST.

            (a)     As  security  for  the  payment  and   performance   of  the
Obligations  (as defined in the Security  Agreement),  Assignor  hereby assigns,
transfers  and  conveys  and  grants a  security  interest  in and  mortgage  to
Assignee, for security purposes, all of Assignor's right, title and interest in,
to and under the following property,  whether now existing or owned or hereafter
acquired,  developed  or  arising  (collectively,   the  "Intellectual  Property
Collateral"):

            (i)     all  patents and patent  applications,  domestic or foreign,
all licenses  relating to any of the foregoing and all income and royalties with
respect to any licenses (including,  without limitation, such patents and patent
applications  as  described  in SCHEDULE A hereto),  all rights to sue for past,
present  or future  infringement  thereof,  all  rights  arising  therefrom  and
pertaining  thereto  and  all  reissues,  divisions,  continuations,   renewals,
extensions and continuations-in-part thereof;



<PAGE>

            (ii)    all  state  (including  common  law),  federal  and  foreign
trademarks,  service marks and trade names, and applications for registration of
such trademarks,  service marks and trade names, all licenses relating to any of
the  foregoing  and all  income  and  royalties  with  respect  to any  licenses
(including,  without limitation, such marks, names and applications as described
in  SCHEDULE  B  hereto),   whether  registered  or  unregistered  and  wherever
registered,  all  rights to sue for past,  present  or  future  infringement  or
unconsented use thereof, all rights arising therefrom and pertaining thereto and
all reissues, extensions and renewals thereof;

            (iii)   the entire goodwill of or associated with the businesses now
or hereafter  conducted by Assignor  connected with and symbolized by any of the
aforementioned properties and assets;

            (iv)    all  general  intangibles  (as  defined  in the UCC) and all
intangible intellectual or other similar property of the Assignor of any kind or
nature,  associated with or arising out of any of the aforementioned  properties
and assets and not otherwise described above; and

            (v)     all products and proceeds of any and all of the foregoing.

            (a)     This Agreement shall create a continuing  security  interest
in the  Intellectual  Property  Collateral  which shall  remain in effect  until
terminated in accordance with Section 17 hereof.

            (b)     Notwithstanding the foregoing  provisions of this Section 2,
the grant of a security interest as provided herein shall not extend to, and the
term "Intellectual Property Collateral" shall not include, (1) that certain U.S.
Patent No. 5,425,946 which is covered by a security interest in favor of Bankers
Trust Company as evidenced by the filing in the U.S. Patent and Trademark Office
(the "Excluded Patent  Collateral"),  and (2) any general  intangibles of Debtor
(whether owned or held as licensee or lessee, or otherwise),  to the extent that
(i) such general  intangibles are not assignable or capable of being  encumbered
as a matter of law or under the terms of the license,  lease or other  agreement
applicable  thereto (but solely to the extent that any such restriction shall be
enforceable under applicable law), without the consent of the licensor or lessor
thereof or other  applicable  party  thereto and (ii) such  consent has not been
obtained; PROVIDED, HOWEVER, that the foregoing grant of security interest shall
extend to, and the term "Intellectual  Property  Collateral" shall include,  (A)
any  general  intangible  which is an  account  receivable  or a proceed  of, or
otherwise  related to the enforcement or collection of, any account  receivable,
or goods  which  are the  subject  of any  account  receivable,  (B) any and all
proceeds of any general  intangibles which are otherwise  excluded to the extent
that the assignment or  encumbrance  of such proceeds is not so restricted,  and
(C) upon obtaining the consent of any such licensor,  lessor or other applicable
party's consent with respect to any such otherwise excluded general intangibles,
such general intangibles as well as any and all proceeds thereof that might have
theretofore  have been excluded  from such grant of a security  interest and the
term "Intellectual Property Collateral."

            SECTION  3  FURTHER   ASSURANCES;   APPOINTMENT   OF   ASSIGNEE   AS
    ATTORNEY-IN-FACT.  Assignor at its expense  shall  execute and  deliver,  or
    cause to be executed and  delivered,  to Assignee any and all  documents and


                                       2
<PAGE>

    instruments,  in form and substance  satisfactory to Assignee,  and take any
    and all action,  which Assignee may reasonably request from time to time, to
    perfect and continue  perfected,  maintain the priority of or provide notice
    of Assignee's security interest in the Intellectual  Property Collateral and
    to accomplish the purposes of this Agreement.  Assignee shall have the right
    to, in the name of the  Assignor,  or in the name of Assignee or  otherwise,
    without  notice  to or  assent  by the  Assignor,  and the  Assignor  hereby
    irrevocably  constitutes  and  appoints  Assignee  (and  any  of  Assignee's
    officers or employees or agents  designated  by Assignee) as the  Assignor's
    true and lawful attorney-in-fact with full power and authority,  (i) to sign
    the name of the Assignor on all or any of such documents or instruments  and
    perform all other acts that Assignee  deems  necessary or advisable in order
    to perfect or continue perfected, maintain the priority or enforceability of
    or provide  notice of  Assignee's  security  interest  in, the  Intellectual
    Property  Collateral,  and (ii) to execute any and all other  documents  and
    instruments, and to perform any and all acts and things for and on behalf of
    the Assignor,  which  Assignee may deem  necessary or advisable to maintain,
    preserve and protect the Intellectual  Property Collateral and to accomplish
    the purposes of this Agreement,  including (A) to defend,  settle, adjust or
    (after the occurrence of any Event of Default) institute any action, suit or
    proceeding with respect to the Intellectual Property Collateral,  and, after
    the  occurrence of any Event of Default,  (B) to assert or retain any rights
    under any license agreement for any of the Intellectual Property Collateral,
    including  without  limitation  any  rights of the  Assignor  arising  under
    Section 365(n) of the  Bankruptcy  Code, and (C) after the occurrence of any
    Event of Default, to execute any and all applications, documents, papers and
    instruments for Assignee to use the  Intellectual  Property  Collateral,  to
    grant or issue any exclusive or  non-exclusive  license or sub-license  with
    respect to any Intellectual  Property Collateral,  and to assign,  convey or
    otherwise  transfer  title  in  or  dispose  of  the  Intellectual  Property
    Collateral;  PROVIDED,  HOWEVER,  that in no event shall  Assignee  have the
    unilateral  power,  prior to the occurrence and  continuation of an Event of
    Default,  to  assign  any of the  Intellectual  Property  Collateral  to any
    Person,  including  itself,  without the  Assignor's  written  consent.  The
    foregoing shall in no way limit Assignee's rights and remedies upon or after
    the  occurrence  of an Event of Default.  The power of attorney set forth in
    this Section 3, being coupled with an interest,  is  irrevocable  so long as
    this Agreement shall not have terminated in accordance with Section 17.

            SECTION 4  FUTURE RIGHTS.  Except as otherwise  expressly  agreed to
in writing by Assignee,  if and when the Assignor shall obtain rights to any new
patentable  inventions or any new trademarks,  or become entitled to the benefit
of any of the  foregoing,  or obtain  rights or  benefits  with  respect  to any
reissue, division,  continuation,  renewal, extension or continuation-in-part of
any patents or trademarks,  or any improvement of any patent,  the provisions of
Section 2 shall  automatically  apply  thereto  and the  Assignor  shall give to
Assignee prompt notice thereof. Assignor shall do all things deemed necessary or
advisable  by  Assignee  to  ensure  the  validity,  perfection,   priority  and
enforceability  of the security  interests  of Assignee in such future  acquired
Intellectual Property Collateral. Assignor hereby authorizes Assignee to modify,
amend,  or supplement the Schedules  hereto and to reexecute this Agreement from
time to time on  Assignor's  behalf and as its  attorney-in-fact  to include any
such future Intellectual


                                        3
<PAGE>

    Property Collateral and to cause such reexecuted Agreement or such modified,
    amended or supplemented Schedules to be filed with PTO.

            SECTION 5  ASSIGNEE'S   DUTIES.    Notwithstanding   any   provision
contained in this Agreement,  Assignee shall have no duty to exercise any of the
rights,  privileges or powers afforded to it and shall not be responsible to the
Assignor  or any other  Person  for any  failure  to do so or delay in doing so.
Except for the accounting for moneys actually received by Assignee  hereunder or
in connection herewith,  Assignee shall have no duty or liability to exercise or
preserve  any  rights,  privileges  or  powers  pertaining  to the  Intellectual
Property Collateral.

            SECTION 6  REPRESENTATIONS AND WARRANTIES.  Assignor  represents and
    warrants to Assignee that:

            (a) A true  and  correct  list of all of the  existing  Intellectual
Property  Collateral  consisting of U.S. patents and patent  applications and/or
registrations  owned  by the  Assignor,  in whole or in  part,  and  pledged  as
collateral hereunder, is set forth in SCHEDULE A.

            (b) A true  and  correct  list of all of the  existing  Intellectual
Property  Collateral  consisting  of U.S.  trademarks,  trademark  registrations
and/or  applications owned by the Assignor,  in whole or in part, and pledged as
collateral hereunder is set forth in SCHEDULE B.

            (c) All  patents,  trademarks,  service  marks  and  trade  names of
Assignor are subsisting and have not been adjudged  invalid or  unenforceable in
whole or in part.

            (d) All  maintenance  fees  required  to be paid on  account  of any
patents or  trademarks of Assignor  have been timely paid for  maintaining  such
patents and trademarks in force, and, to the best of Assignor's knowledge,  each
of the patents and trademarks  constituting  part of the  Intellectual  Property
Collateral is valid and enforceable.

            (e) To the  best of  Assignor's  knowledge  after  due  inquiry,  no
material  infringement  or  unauthorized  use  presently  is  being  made of any
Intellectual Property Collateral by any Person.

            (f) Except as  otherwise  disclosed  in writing by Debtor to Secured
Party,  Assignor is the sole and exclusive  owner of the  Intellectual  Property
Collateral  and  the  past,   present  and  contemplated   future  use  of  such
Intellectual  Property  Collateral  by Assignor  has not,  does not and will not
infringe or violate any right,  privilege  or license  agreement  of or with any
other Person.

            SECTION 7  COVENANTS.

            (a)  Assignor  will  appear  in  and  defend  any  action,  suit  or
proceeding  which may  affect to a material  extent its title to, or  Assignee's
rights or interest in, the Intellectual Property Collateral.

                                        4
<PAGE>

            (b)  Assignor  will not allow or suffer  any  Intellectual  Property
Collateral to become abandoned,  nor any registration  thereof to be terminated,
forfeited, expired or dedicated to the public.

            (c) Assignor will diligently  prosecute all applications for patents
and   trademarks,   and  file   and   prosecute   any  and  all   continuations,
continuations-in-part, applications for reissue, applications for certificate of
correction and like matters as shall be reasonable and appropriate in accordance
with  prudent  business  practice,  and  promptly  pay any and all  maintenance,
license,  registration and other fees, taxes and expenses incurred in connection
with any Intellectual Property Collateral.

            SECTION 8  ASSIGNEE'S RIGHTS AND REMEDIES.

            (a) Assignee  shall  have all rights and  remedies  available  to it
under the  Security  Agreement,  the other  Documents  and  applicable  law with
respect to the security interests in any of the Intellectual Property Collateral
or any other collateral.  Assignor agrees that such rights and remedies include,
but are not  limited  to, the right of  Assignee  as a secured  party to sell or
otherwise  dispose of its collateral after default pursuant to the UCC. Assignor
agrees that Assignee shall at all times have such royalty free licenses,  to the
extent permitted by law and to the extent of Assignor's rights therein,  for any
Intellectual  Property  Collateral that shall be reasonably  necessary to permit
the  exercise  of any of  Assignee's  rights  or  remedies  upon  or  after  the
occurrence  of an Event of  Default  and  shall  additionally  have the right to
license and/or sublicense any Intellectual Property Collateral upon or after the
occurrence of an Event of Default,  whether general,  special or otherwise,  and
whether  on an  exclusive  or a  nonexclusive  basis,  any of  the  Intellectual
Property  Collateral,  throughout  the world  for such  term or  terms,  on such
conditions,  and in such  manner,  as  Assignee  in its  sole  discretion  shall
determine.  In addition to and without  limiting any of the foregoing,  upon the
occurrence  and during the  continuance  of an Event of Default,  Assignee shall
have the right but shall in no way be obligated  to bring suit,  or to take such
other  action as  Assignee  deems  necessary  or  advisable,  in the name of the
Assignor or  Assignee,  to enforce or protect any of the  Intellectual  Property
Collateral,  in which event the Assignor shall,  at the request of Assignee,  do
any and all lawful acts and execute any and all  documents  required by Assignee
in aid of such enforcement. To the extent that Assignee shall elect not to bring
suit to enforce such Intellectual  Property  Collateral,  Assignor agrees to use
all  reasonable  measures and its  diligent  efforts,  whether by action,  suit,
proceeding  or  otherwise,  to prevent  the  infringement,  misappropriation  or
violations  thereof by others and for that purpose agrees diligently to maintain
any action,  suit or  proceeding  against any Person  necessary  to prevent such
infringement, misappropriation or violation.

            (b) The  cash  proceeds  actually  received  from  the sale or other
disposition or collection of  Intellectual  Property  Collateral,  and any other
amounts  received  in  respect  of  the  Intellectual  Property  Collateral  the
application of which is not otherwise  provided for herein,  shall be applied as
provided in the Security Agreement.

            SECTION 9 NOTICES.  All  notices or other  communications  hereunder
shall be in writing (including by facsimile  transmission) shall be mailed, sent
or delivered in accordance with the Security Agreement at or to their respective



                                       5
<PAGE>

addresses  or  facsimile  numbers set forth  below their names on the  signature
pages  hereof,  or at or to such other  address or facsimile  number as shall be
designated  by any party in a written  notice to the other parties  hereto.  All
such  notices and other  communications  shall be  effective  as provided in the
Security Agreement.

            SECTION 10  NO WAIVER;  CUMULATIVE REMEDIES.  No failure on the part
of Assignee to exercise, and no delay in exercising, any right, remedy, power or
privilege  hereunder shall operate as a waiver thereof,  nor shall any single or
partial  exercise of any such right,  remedy,  power or  privilege  preclude any
other or further  exercise  thereof or the exercise of any other right,  remedy,
power or privilege.  The rights and remedies under this Agreement are cumulative
and not  exclusive  of any  rights,  remedies,  powers and  privileges  that may
otherwise be available to Assignee.

            SECTION 11  COSTS AND EXPENSES; INDEMNITY.

            (a) Assignor  agrees to  pay on demand  all  costs and  expenses  of
Assignee,  including without  limitation all attorneys' fees, in connection with
the enforcement or attempted  enforcement of, and  preservation of any rights or
interests under, this Agreement,  and the assignment,  sale or other disposal of
any of the Intellectual Property Collateral.

            (b) Assignor  hereby  agrees to indemnify  Assignee,  any  affiliate
thereof, and their respective directors,  officers,  employees,  agents, counsel
and other advisors (each an "Indemnified Person") against, and hold each of them
harmless from, any and all liabilities,  obligations,  losses, claims,  damages,
penalties,  actions,  judgments,  suits, costs, expenses or disbursements of any
kind or nature whatsoever,  including, without limitation, reasonable attorneys'
fees and attorneys'  fees incurred  pursuant to 11 U.S.C.,  which may be imposed
on, incurred by, or asserted against any Indemnified Person, in any way relating
to  or  arising  out  of  this  Agreement,  including  in  connection  with  any
infringement or alleged  infringement with respect to any Intellectual  Property
Collateral,  or any action  taken or omitted  to be taken by it  hereunder  (the
"Indemnified  Liabilities");  PROVIDED that Assignor  shall not be liable to any
Indemnified Person for any portion of such Indemnified Liabilities to the extent
they are found by a final decision of a court of competent  jurisdiction to have
resulted from such Indemnified  Person's gross negligence or willful misconduct.
If and to the extent that the foregoing  indemnification  is for any reason held
unenforceable,  Assignor agrees to make the maximum  contribution to the payment
and  satisfaction  of each of the Indemnified  Liabilities  which is permissible
under applicable law.

            (c) Any  amounts  payable  to  Assignee  under  this  Section  11 or
otherwise  under this Agreement if not paid upon demand shall bear interest from
the date of such demand until paid in full,  at the default rate of interest set
forth in the Loan Agreement.

            SECTION 12 BINDING  EFFECT.  This  Agreement  shall be binding upon,
inure to the  benefit of and be  enforceable  by  Assignor,  Assignee  and their
respective successors and assigns.


                                       6
<PAGE>

            SECTION 13  GOVERNING LAW. This Agreement  shall be governed by, and
    construed in accordance  with,  the law of the State of New York,  except to
    the extent that the validity or  perfection of the  assignment  and security
    interests  hereunder in respect of any Intellectual  Property Collateral are
    governed by federal law and except to the extent  that  Assignee  shall have
    greater  rights or remedies  under federal law, in which case such choice of
    New York law shall not be deemed to  deprive  Assignee  of such  rights  and
    remedies as may be available under federal law.

            SECTION 14  AMENDMENT. This Agreement shall not be amended except by
    the written agreement of the parties.

            SECTION 15 SEVERABILITY.  Whenever possible,  each provision of this
    Agreement  shall be  interpreted in such manner as to be effective and valid
    under all applicable laws and  regulations.  If,  however,  any provision of
    this  Agreement  shall be  prohibited  by or  invalid  under any such law or
    regulation in any jurisdiction, it shall, as to such jurisdiction, be deemed
    modified to conform to the minimum  requirements  of such law or regulation,
    or, if for any reason it is not deemed so modified,  it shall be ineffective
    and invalid only to the extent of such  prohibition  or  invalidity  without
    affecting the remaining  provisions  of this  Agreement,  or the validity or
    effectiveness of such provision in any other jurisdiction.

            SECTION 16  COUNTERPARTS.  This  Agreement  may be  executed  in any
    number  of  counterparts  and  by  different   parties  hereto  in  separate
    counterparts,  each of  which  when so  executed  shall be  deemed  to be an
    original and all of which taken  together  shall  constitute but one and the
    same agreement.

            SECTION 17  TERMINATION. Upon payment and performance in full of all
    Obligations,  this  Agreement  shall  terminate and Assignee  shall promptly
    execute and deliver to Assignor such  documents and  instruments  reasonably
    requested by Assignor as shall be necessary to evidence  termination  of all
    security  interests  given by  Assignor  to  Assignee  hereunder,  including
    cancellation  of this  Agreement by written notice from Assignee to the PTO;
    PROVIDED,  HOWEVER, that the obligations of Assignor under Section 11 hereof
    shall survive such termination.

            SECTION 18  SECURITY  AGREEMENT.   Assignor  acknowledges  that  the
    rights and remedies of Assignee  with  respect to the security  interests in
    the Intellectual Property Collateral granted hereby are more fully set forth
    in the Security Agreement and all such rights and remedies are cumulative.

            SECTION 19  NO INCONSISTENT REQUIREMENTS. Assignor acknowledges that
    this  Agreement and the Security  Agreement may contain  covenants and other
    terms and provisions variously stated regarding the same or similar matters,
    and the Assignor  agrees that all such  covenants,  terms and provisions are
    cumulative and all shall be performed and satisfied in accordance with their
    respective terms.


                                        7
<PAGE>


            IN WITNESS  WHEREOF,  the  parties  hereto have duly  executed  this
Agreement, as of the date first above written.



                                     NORTH AMERICAN VACCINE, INC.


                                     By /s/ Lawrence J. Hineline
                                        -----------------------------
                                        Title: Vice-President Finance

                                     10150 Old Columbia Road
                                     Columbia, Maryland  21046
                                     Attn: Vice-President
                                     Fax: (410) 309-4077


                                     BANK OF AMERICA, N.A.


                                     By /s/ Lawrence J. Gordon
                                        -----------------------------
                                        Title: Vice-President

                                     Bank of America Center
                                     700 Louisiana Street,
                                     TX4-213-08-10
                                     Houston, Texas 77002-2700
                                     Attn: Lawrence J. Gordon
                                     Fax: (713) 247-6719


                                        8
<PAGE>


STATE OF Texas   )
                 ) ss
COUNTY OF Harris )


                On November 2, 1999,  before me, Beth L. Erwin,  Notary  Public,
personally appeared Larry J. Gordon,  personally known to me (or proved to me on
the basis of  satisfactory  evidence) to be the person(s)  whose name(s)  is/are
subscribed to the within  instrument  and  acknowledged  to me that  he/she/they
executed  the  same  in  his/her/their  authorized  capacity(ies),  and  that by
his/her/their  signature(s) on the instrument the person(s),  or the entity upon
behalf of which the person(s) acted, executed the instrument.

            WITNESS my hand and official seal.



                                        /s/ Beth L. Erwin
                                        -----------------
                                        Signature


[SEAL]




                                        9
<PAGE>


STATE OF CALIFORNIA         )
                            )  ss
COUNTY OF _________________ )


            On ___________ , before me, _____________, Notary Public, personally
appeared ___________________________, personally known to me (or proved to me on
the basis of  satisfactory  evidence) to be the person(s)  whose name(s)  is/are
subscribed to the within  instrument  and  acknowledged  to me that  he/she/they
executed  the  same  in  his/her/their  authorized  capacity(ies),  and  that by
his/her/their  signature(s) on the instrument the person(s),  or the entity upon
behalf of which the person(s) acted, executed the instrument.

            WITNESS my hand and official seal.




                                        ____________________________________
                                        Signature



[SEAL]






                                       10
<PAGE>

<TABLE>
<CAPTION>

                                                                 SCHEDULE A
- ------------------------------------------------------------------------------------------------------------------------------------
                                                 PATENTS AND PATENT APPLICATIONS OF ASSIGNOR
- ------------------------------------------------------------------------------------------------------------------------------------
ISSUED U.S. PATENTS
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                               <C>                <C>                <C>                  <C>                   <C>
Method for the High Level         Blake, et al.      NVX                08/798,760           February 11, 1997     Notice of
Expression, Purification and                         (co-exclusive      (Notice of Allowance                       Allowance issued
Refolding of the Outer Membrane                      license with PMC)  issued Jan. 1999)                          January 1999
Group B Porin Proteins                                                                                             (fee paid April
                                                                                                                   1999)
- ------------------------------------------------------------------------------------------------------------------------------------
Method for the High Level         Blake, et al.      NVX & Rockefeller  5,439,808            August 8, 1995        Patent
Expression, Purification and                         University
Refolding of the Outer Membrane                      (co-exclusive
Group B Porin Proteins from                          license with PMC)
Neisseria Meningitidis
- ------------------------------------------------------------------------------------------------------------------------------------
Method for the High Level         Blake, et al.      NVX                5,747,287            May 5, 1998           Patent
Expression, Purification and                         (co-exclusive
Refolding of the Outer Membrane                      license with PMC)
Group B Porin Proteins from
Neisseria Meningitidis
- ------------------------------------------------------------------------------------------------------------------------------------
Group A Streptococcal             Blake et al.       NVX & Rockefeller  5,866,135            February 2, 1999      Patent
Polysaccharide Immunogenic                           University
Compositions and Methods
- ------------------------------------------------------------------------------------------------------------------------------------
Method for the High Level         Blake, et al.      NVX                5,879,686            March 9, 1999         Patent
Expression, Purification and                         (co-exclusive
Refolding of the Outer Membrane                      license with PMC)
Group B Porin Proteins from
Neisseria Meningitidis
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------------------------------------------------
U.S. PATENT APPLICATIONS
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                      <C>                     <C>           <C>                <C>                  <C>
Method for the High Level                Tai, et al.             NVX           08/096,181         July 23, 1993        Application
Expression, Purification and
Refolding of the Outer Membrane
Protein P2 from Haemophilus Type b
- ------------------------------------------------------------------------------------------------------------------------------------
Method for the High Level                Tai, et al.             NVX           08/449,358          May 24, 1995        Application
Expression, Purification and
Refolding of the Outer Membrane
Protein P2 from Haemophilus Type b
- ------------------------------------------------------------------------------------------------------------------------------------
Antigenic Group B Streptococcus         Michon, et al.           NVX           08/481,883          June 7, 1995        Application
Type II and Type III
Polysaccharide Fragments Having a
2,5-Anhydro-D-Mannose Terminal
Structure and Conjugate Vaccine
Thereof
- ------------------------------------------------------------------------------------------------------------------------------------
Direct Methods for Molar-Mass          Michon, D'Ambra           NVX           08/753,242       November 22, 1996      Application
Determination of Fragments of
Haemophilus Type b Capsular
Polysaccharides and Vaccine
Preparation
- ------------------------------------------------------------------------------------------------------------------------------------
Cloning of Non-IgA FC Binding             Tai, Blake             NVX           08/923,992       September 5, 1997      Application
Forms of the Group B Streptococcal
Beta Antigens
- ------------------------------------------------------------------------------------------------------------------------------------
Antigenic Group B Streptococcus         Michon, et al.           NVX           09/025,225       February 18, 1998      Application
Type II and Type III
Polysaccharide Fragments Having a
2,5-Anhydro-D-Mannose Terminal
Structure and Conjugate Vaccine
Thereof
- ------------------------------------------------------------------------------------------------------------------------------------

<PAGE>

- ------------------------------------------------------------------------------------------------------------------------------------
Immunogenic Conjugates Comprising       Blake, et al.            NVX           09/118/180         July 17, 1998        Application
A Group B Meningococcal Porin and
an H. Influenzae Polysaccharide
- ------------------------------------------------------------------------------------------------------------------------------------
Modified Immunogenic Pneumolysin       Minetti, et al.           NVX           09/120,044         July 21, 1998        Application
Compositions as Vaccines
- ------------------------------------------------------------------------------------------------------------------------------------
Group A Streptococcal                    Blake et al.           NVX &          09/207,188        December 8, 1998      Application
Polysaccharide Immunogenic                                   Rockefeller
Compositions and Methods                                     University
- ------------------------------------------------------------------------------------------------------------------------------------
Procedures for the Extraction and       Michon, Blake            NVX           09/221,620       December 23, 1998      Application
Isolation of Bacterial Capsular
Polysaccharides for Use as
Vaccines or Linked to Proteins as
Conjugate Vaccines
- ------------------------------------------------------------------------------------------------------------------------------------
Gram Positive Bacterial Antigens       Long-Rowe, Blake          NVX           09/399,220       September 17, 1999     Application
and Methods of Purification of the
Streptococcal C-Beta Protein
- ------------------------------------------------------------------------------------------------------------------------------------
Immunogenic Polysaccharide-Protein      Michon et al.            NVX           09/376,911        August 18, 1999       Application
Conjugate Useful as a Vaccine
Produced Via Conjugation Through a
CZ-3 N-Acyl Portion F A
Polysaccharide
- ------------------------------------------------------------------------------------------------------------------------------------

</TABLE>

                                      A-1
<PAGE>

<TABLE>
<CAPTION>

- ---------------------------------------------------------------------------------------------------------------------------
                                                                 SCHEDULE B
- ---------------------------------------------------------------------------------------------------------------------------
                                                         U.S. TRADEMARKS OF ASSIGNOR
- ---------------------------------------------------------------------------------------------------------------------------
MARK                               STATUS              APPL NO./     APPL./REGIS. DATE        OWNER OF RECORD
                                                       REGIS. NO.
- ---------------------------------------------------------------------------------------------------------------------------
     REGISTERED U.S. TRADEMARKS
- ---------------------------------------------------------------------------------------------------------------------------
<S>                                <C>                 <C>           <C>                      <C>
Globe Design                       Registered          1,932,111     October 31, 1995         North American Vaccine, Inc.
- ---------------------------------------------------------------------------------------------------------------------------
AMVAX                              Registered          1,967,632     April 16, 1996           North American Vaccine, Inc.
- ---------------------------------------------------------------------------------------------------------------------------
TRINAVACEL                         Registered          2,101,121     September 30, 1997       American Vaccine Corporation
- ---------------------------------------------------------------------------------------------------------------------------
TRIVAX                             Registered          2,118,360     December 2, 1997         American Vaccine Corporation
- ---------------------------------------------------------------------------------------------------------------------------
NAVA                               Registered          2,267,812     August 3, 1999           American Vaccine Corporation
- ---------------------------------------------------------------------------------------------------------------------------
     PENDING U.S. TRADEMARK APPLICATIONS
- ---------------------------------------------------------------------------------------------------------------------------
THE IMPORTANCE OF OUR WORK         Pending             75/190,826    October 29, 1996         American Vaccine Corporation
GROWS BIGGER EVERY DAY
- ---------------------------------------------------------------------------------------------------------------------------
NEISVAC-C                          Pending             Not Avail.    August 26, 1999          American Vaccine Corporation
- ---------------------------------------------------------------------------------------------------------------------------
NEISIVA                            Pending             Not Avail.    August 26, 1999          American Vaccine Corporation
- ---------------------------------------------------------------------------------------------------------------------------
MENCIVA                            Pending             Not Avail.    August 26, 1999          American Vaccine Corporation
- ---------------------------------------------------------------------------------------------------------------------------
</TABLE>

                                      B-1


             PATENT AND TRADEMARK ASSIGNMENT AND SECURITY AGREEMENT

            THIS PATENT AND TRADEMARK  ASSIGNMENT AND SECURITY  AGREEMENT  (this
"Agreement"),  dated as of  November 1, 1999,  is made  between  NORTH  AMERICAN
VACCINE,  INC., a Canadian  corporation  ("Assignor")  and BAXTER  INTERATIONAL,
INC., a Delaware corporation ("Assignee").

         Assignor and Assignee are parties to a Security  Agreement  dated as of
November 1, 1999 (as amended,  modified,  renewed or extended from time to time,
the  "Security  Agreement"),  which  Security  Agreement  provides,  among other
things,  for the  assignment  by Assignor to Assignee,  and grant by Assignor to
Assignee of a security  interest in, certain of Assignor's  property and assets,
including,  without  limitation,  its  patents  and  patent  applications,   its
trademarks, service marks and trade names, and its applications for registration
of such  trademarks,  service  marks  and  trade  names.  Pursuant  to the  Loan
Agreement  Assignor has agreed to execute and deliver this Agreement to Assignee
for filing with the United States  Patent and Trademark  Office (the "PTO") (and
any other relevant  recording systems in any domestic or foreign  jurisdiction),
and as further  evidence of and to effectuate  such assignment of and grant of a
security interest in such patents and patent applications,  trademarks,  service
marks and trade names,  and  applications  for  registration of such trademarks,
service  marks and trade  names,  and the other  general  intangibles  described
herein. Accordingly, Assignor and Assignee hereby agree as follows:

         SECTION 1 DEFINITIONS; INTERPRETATION.

         (a) All  capitalized  terms used in this  Agreement  and not  otherwise
defined  herein  shall  have  the  meanings  assigned  to them  in the  Security
Agreement.

         (b) In this  Agreement,  (i) the  meaning  of  defined  terms  shall be
equally  applicable to both the singular and plural forms of the terms  defined;
and (ii) the captions and headings  are for  convenience  of reference  only and
shall not affect the construction of this Agreement.

         SECTION 2 ASSIGNMENT AND GRANT OF SECURITY INTEREST.

         (a) As security for the payment and  performance of the Obligations (as
defined in the Security  Agreement),  Assignor  hereby  assigns,  transfers  and
conveys and grants a security interest in and mortgage to Assignee, for security
purposes,  all of  Assignor's  right,  title and  interest  in, to and under the
following  property,  whether  now  existing  or  owned or  hereafter  acquired,
developed or arising (collectively, the "Intellectual Property Collateral"):

         (i)   all patents and patent applications,  domestic  or  foreign,  all
licenses  relating to any of the  foregoing  and all income and  royalties  with
respect to any licenses (including,  without limitation, such patents and patent
applications  as  described  in SCHEDULE A hereto),  all rights to sue for past,
present  or future  infringement  thereof,  all  rights  arising  therefrom  and
pertaining  thereto  and  all  reissues,  divisions,  continuations,   renewals,
extensions and continuations-in-part thereof;


                                       1.
<PAGE>

         (ii)  all state (including common law), federal and foreign trademarks,
service  marks  and trade  names,  and  applications  for  registration  of such
trademarks,  service marks and trade names, all licenses  relating to any of the
foregoing and all income and royalties with respect to any licenses  (including,
without limitation,  such marks, names and applications as described in SCHEDULE
B hereto),  whether  registered or  unregistered  and wherever  registered,  all
rights to sue for  past,  present  or future  infringement  or  unconsented  use
thereof,  all rights arising therefrom and pertaining  thereto and all reissues,
extensions and renewals thereof;

         (iii) the entire  goodwill of or associated  with the businesses now or
hereafter  conducted by Assignor  connected  with and  symbolized  by any of the
aforementioned properties and assets;

         (iv)  all  general  intangibles  (as  defined  in  the  UCC)  and   all
intangible intellectual or other similar property of the Assignor of any kind or
nature,  associated with or arising out of any of the aforementioned  properties
and assets and not otherwise described above; and

         (v)   all products and proceeds of any and all of the foregoing.

         (a)   This Agreement shall create a continuing security interest in the
Intellectual  Property  Collateral which shall remain in effect until terminated
in accordance with Section 17 hereof.

         (b)   Notwithstanding  the foregoing  provisions of this Section 2, the
grant of a security  interest  as provided  herein  shall not extend to, and the
term "Intellectual Property Collateral" shall not include, (1) that certain U.S.
Patent No. 5,425,946 which is covered by a security interest in favor of Bankers
Trust Company as evidenced by the filing in the U.S. Patent and Trademark Office
(the "Excluded Patent  Collateral"),  and (2) any general  intangibles of Debtor
(whether owned or held as licensee or lessee, or otherwise),  to the extent that
(i) such general  intangibles are not assignable or capable of being  encumbered
as a matter of law or under the terms of the license,  lease or other  agreement
applicable  thereto (but solely to the extent that any such restriction shall be
enforceable under applicable law), without the consent of the licensor or lessor
thereof or other  applicable  party  thereto and (ii) such  consent has not been
obtained; PROVIDED, HOWEVER, that the foregoing grant of security interest shall
extend to, and the term "Intellectual  Property  Collateral" shall include,  (A)
any  general  intangible  which is an  account  receivable  or a proceed  of, or
otherwise  related to the enforcement or collection of, any account  receivable,
or goods  which  are the  subject  of any  account  receivable,  (B) any and all
proceeds of any general  intangibles which are otherwise  excluded to the extent
that the assignment or  encumbrance  of such proceeds is not so restricted,  and
(C) upon obtaining the consent of any such licensor,  lessor or other applicable
party's consent with respect to any such otherwise excluded general intangibles,
such general intangibles as well as any and all proceeds thereof that might have
theretofore  have been excluded  from such grant of a security  interest and the
term "Intellectual Property Collateral."

         SECTION   3   FURTHER   ASSURANCES;    APPOINTMENT   OF   ASSIGNEE   AS
ATTORNEY-IN-FACT. Assignor at its expense shall execute and deliver, or cause to
be executed and delivered, to Assignee any and all documents and instruments, in

                                       2.
<PAGE>

form and substance  satisfactory to Assignee, and take any and all action, which
Assignee  may  reasonably  request  from time to time,  to perfect and  continue
perfected,  maintain the priority of or provide  notice of  Assignee's  security
interest in the Intellectual  Property Collateral and to accomplish the purposes
of this  Agreement.  Assignee  shall  have  the  right  to,  in the  name of the
Assignor,  or in the name of Assignee or otherwise,  without notice to or assent
by the Assignor,  and the Assignor hereby  irrevocably  constitutes and appoints
Assignee  (and any of Assignee's  officers or employees or agents  designated by
Assignee) as the Assignor's true and lawful attorney-in-fact with full power and
authority,  (i) to sign the name of the Assignor on all or any of such documents
or  instruments  and perform all other acts that  Assignee  deems  necessary  or
advisable  in order to perfect or continue  perfected,  maintain the priority or
enforceability  of or provide  notice of  Assignee's  security  interest in, the
Intellectual  Property  Collateral,  and  (ii) to  execute  any  and  all  other
documents and instruments, and to perform any and all acts and things for and on
behalf of the  Assignor,  which  Assignee  may deem  necessary  or  advisable to
maintain,  preserve  and protect the  Intellectual  Property  Collateral  and to
accomplish  the purposes of this  Agreement,  including  (A) to defend,  settle,
adjust or (after the  occurrence of any Event of Default)  institute any action,
suit or proceeding with respect to the Intellectual  Property  Collateral,  and,
after the occurrence of any Event of Default, (B) to assert or retain any rights
under any license  agreement for any of the  Intellectual  Property  Collateral,
including  without  limitation any rights of the Assignor  arising under Section
365(n) of the  Bankruptcy  Code,  and (C) after the  occurrence  of any Event of
Default, to execute any and all applications,  documents, papers and instruments
for Assignee to use the Intellectual Property Collateral,  to grant or issue any
exclusive  or   non-exclusive   license  or  sub-license  with  respect  to  any
Intellectual  Property Collateral,  and to assign,  convey or otherwise transfer
title in or dispose of the Intellectual Property Collateral;  provided, however,
that in no  event  shall  Assignee  have  the  unilateral  power,  prior  to the
occurrence  and  continuation  of an  Event of  Default,  to  assign  any of the
Intellectual  Property Collateral to any Person,  including itself,  without the
Assignor's  written  consent.  The  foregoing  shall in no way limit  Assignee's
rights and remedies  upon or after the  occurrence  of an Event of Default.  The
power of attorney set forth in this  Section 3, being  coupled with an interest,
is irrevocable so long as this Agreement shall not have terminated in accordance
with Section 17.

         SECTION 4  FUTURE RIGHTS.  Except as otherwise  expressly  agreed to in
writing by  Assignee,  if and when the Assignor  shall obtain  rights to any new
patentable  inventions or any new trademarks,  or become entitled to the benefit
of any of the  foregoing,  or obtain  rights or  benefits  with  respect  to any
reissue, division,  continuation,  renewal, extension or continuation-in-part of
any patents or trademarks,  or any improvement of any patent,  the provisions of
Section 2 shall  automatically  apply  thereto  and the  Assignor  shall give to
Assignee prompt notice thereof. Assignor shall do all things deemed necessary or
advisable  by  Assignee  to  ensure  the  validity,  perfection,   priority  and
enforceability  of the security  interests  of Assignee in such future  acquired
Intellectual Property Collateral. Assignor hereby authorizes Assignee to modify,
amend,  or supplement the Schedules  hereto and to reexecute this Agreement from
time to time on  Assignor's  behalf and as its  attorney-in-fact  to include any

                                       3.
<PAGE>

such  future  Intellectual  Property  Collateral  and to cause  such  reexecuted
Agreement or such modified,  amended or supplemented  Schedules to be filed with
PTO.

         SECTION 5  ASSIGNEE'S DUTIES.  Notwithstanding any  provision contained
in this Agreement, Assignee shall have no duty to  exercise  any of the  rights,
privileges or powers afforded to it and shall not be responsible to the Assignor
or any other  Person for any  failure to do so or delay in doing so.  Except for
the  accounting  for  moneys  actually  received  by  Assignee  hereunder  or in
connection  herewith,  Assignee  shall have no duty or  liability to exercise or
preserve  any  rights,  privileges  or  powers  pertaining  to the  Intellectual
Property Collateral.

         SECTION 6  REPRESENTATIONS  AND  WARRANTIES.  Assignor  represents  and
warrants to Assignee that:

         (a) A true  and  correct  list  of all  of  the  existing  Intellectual
Property  Collateral  consisting of U.S. patents and patent  applications and/or
registrations  owned  by the  Assignor,  in whole or in  part,  and  pledged  as
collateral hereunder, is set forth in SCHEDULE A.

         (b) A true  and  correct  list  of all  of  the  existing  Intellectual
Property  Collateral  consisting  of U.S.  trademarks,  trademark  registrations
and/or  applications owned by the Assignor,  in whole or in part, and pledged as
collateral hereunder is set forth in SCHEDULE B.

         (c) All patents, trademarks,  service marks and trade names of Assignor
are subsisting and have not been adjudged  invalid or  unenforceable in whole or
in part.

         (d) All maintenance  fees required to be paid on account of any patents
or trademarks of Assignor have been timely paid for maintaining such patents and
trademarks  in force,  and,  to the best of  Assignor's  knowledge,  each of the
patents and trademarks constituting part of the Intellectual Property Collateral
is valid and enforceable.

         (e) To the best of Assignor's  knowledge after due inquiry, no material
infringement  or  unauthorized  use presently is being made of any  Intellectual
Property Collateral by any Person.

         (f) Except as  otherwise  disclosed  in  writing  by  Debtor to Secured
Party,  Assignor is the sole and exclusive  owner of the  Intellectual  Property
Collateral  and  the  past,   present  and  contemplated   future  use  of  such
Intellectual  Property  Collateral  by Assignor  has not,  does not and will not
infringe or violate any right,  privilege  or license  agreement  of or with any
other Person.

         SECTION 7  COVENANTS.

         (a) Assignor  will appear in and defend any action,  suit or proceeding
which may affect to a  material  extent  its title to, or  Assignee's  rights or
interest in, the Intellectual Property Collateral.


                                       4.
<PAGE>

         (b) Assignor  will  not  allow  or  suffer  any  Intellectual  Property
Collateral to become abandoned,  nor any registration  thereof to be terminated,
forfeited, expired or dedicated to the public.

         (c) Assignor will diligently prosecute all applications for patents and
trademarks,    and   file   and   prosecute    any   and   all    continuations,
continuations-in-part, applications for reissue, applications for certificate of
correction and like matters as shall be reasonable and appropriate in accordance
with  prudent  business  practice,  and  promptly  pay any and all  maintenance,
license,  registration and other fees, taxes and expenses incurred in connection
with any Intellectual Property Collateral.

         SECTION 8  ASSIGNEE'S RIGHTS AND REMEDIES.

         (a) Assignee  shall have all rights and remedies  available to it under
the Security  Agreement,  the other Documents and applicable law with respect to
the security  interests in any of the  Intellectual  Property  Collateral or any
other collateral. Assignor agrees that such rights and remedies include, but are
not limited to, the right of  Assignee as a secured  party to sell or  otherwise
dispose of its collateral  after default  pursuant to the UCC.  Assignor  agrees
that Assignee shall at all times have such royalty free licenses,  to the extent
permitted  by law  and to the  extent  of  Assignor's  rights  therein,  for any
Intellectual  Property  Collateral that shall be reasonably  necessary to permit
the  exercise  of any of  Assignee's  rights  or  remedies  upon  or  after  the
occurrence  of an Event of  Default  and  shall  additionally  have the right to
license and/or sublicense any Intellectual Property Collateral upon or after the
occurrence of an Event of Default,  whether general,  special or otherwise,  and
whether  on an  exclusive  or a  nonexclusive  basis,  any of  the  Intellectual
Property  Collateral,  throughout  the world  for such  term or  terms,  on such
conditions,  and in such  manner,  as  Assignee  in its  sole  discretion  shall
determine.  In addition to and without  limiting any of the foregoing,  upon the
occurrence  and during the  continuance  of an Event of Default,  Assignee shall
have the right but shall in no way be obligated  to bring suit,  or to take such
other  action as  Assignee  deems  necessary  or  advisable,  in the name of the
Assignor or  Assignee,  to enforce or protect any of the  Intellectual  Property
Collateral,  in which event the Assignor shall,  at the request of Assignee,  do
any and all lawful acts and execute any and all  documents  required by Assignee
in aid of such enforcement. To the extent that Assignee shall elect not to bring
suit to enforce such Intellectual  Property  Collateral,  Assignor agrees to use
all  reasonable  measures and its  diligent  efforts,  whether by action,  suit,
proceeding  or  otherwise,  to prevent  the  infringement,  misappropriation  or
violations  thereof by others and for that purpose agrees diligently to maintain
any action,  suit or  proceeding  against any Person  necessary  to prevent such
infringement, misappropriation or violation.

         (b) The  cash  proceeds  actually  received  from  the  sale  or  other
disposition or collection of  Intellectual  Property  Collateral,  and any other
amounts  received  in  respect  of  the  Intellectual  Property  Collateral  the
application of which is not otherwise  provided for herein,  shall be applied as
provided in the Security Agreement.

         SECTION 9  NOTICES. All notices or other communications hereunder shall
be in writing  (including by facsimile  transmission)  shall be mailed,  sent or

                                       5.
<PAGE>

delivered in accordance  with the Security  Agreement at or to their  respective
addresses  or  facsimile  numbers set forth  below their names on the  signature
pages  hereof,  or at or to such other  address or facsimile  number as shall be
designated  by any party in a written  notice to the other parties  hereto.  All
such  notices and other  communications  shall be  effective  as provided in the
Security Agreement.

         SECTION 10  NO WAIVER; CUMULATIVE  REMEDIES.  No failure on the part of
Assignee to exercise,  and no delay in exercising,  any right,  remedy, power or
privilege  hereunder shall operate as a waiver thereof,  nor shall any single or
partial  exercise of any such right,  remedy,  power or  privilege  preclude any
other or further  exercise  thereof or the exercise of any other right,  remedy,
power or privilege.  The rights and remedies under this Agreement are cumulative
and not  exclusive  of any  rights,  remedies,  powers and  privileges  that may
otherwise be available to Assignee.

         SECTION 11  COSTS AND EXPENSES; INDEMNITY.

         (a)  Assignor  agrees  to pay on  demand  all  costs  and  expenses  of
Assignee,  including without  limitation all attorneys' fees, in connection with
the enforcement or attempted  enforcement of, and  preservation of any rights or
interests under, this Agreement,  and the assignment,  sale or other disposal of
any of the Intellectual Property Collateral.

         (b)  Assignor  hereby  agrees  to  indemnify  Assignee,  any  affiliate
thereof, and their respective directors,  officers,  employees,  agents, counsel
and other advisors (each an "Indemnified Person") against, and hold each of them
harmless from, any and all liabilities,  obligations,  losses, claims,  damages,
penalties,  actions,  judgments,  suits, costs, expenses or disbursements of any
kind or nature whatsoever,  including, without limitation, reasonable attorneys'
fees and attorneys'  fees incurred  pursuant to 11 U.S.C.,  which may be imposed
on, incurred by, or asserted against any Indemnified Person, in any way relating
to  or  arising  out  of  this  Agreement,  including  in  connection  with  any
infringement or alleged  infringement with respect to any Intellectual  Property
Collateral,  or any action  taken or omitted  to be taken by it  hereunder  (the
"Indemnified  Liabilities");  provided that Assignor  shall not be liable to any
Indemnified Person for any portion of such Indemnified Liabilities to the extent
they are found by a final decision of a court of competent  jurisdiction to have
resulted from such Indemnified  Person's gross negligence or willful misconduct.
If and to the extent that the foregoing  indemnification  is for any reason held
unenforceable,  Assignor agrees to make the maximum  contribution to the payment
and  satisfaction  of each of the Indemnified  Liabilities  which is permissible
under applicable law.

         (c) Any amounts  payable to Assignee under this Section 11 or otherwise
under this  Agreement if not paid upon demand shall bear  interest from the date
of such demand until paid in full,  at the default rate of interest set forth in
the Bank Loan Agreement.

         SECTION 12  BINDING EFFECT. This Agreement shall be binding upon, inure
to the benefit of and be enforceable by Assignor,  Assignee and their respective
successors and assigns.


                                       6.
<PAGE>

         SECTION 13  GOVERNING LAW.  This  Agreement  shall  be governed by, and
construed in accordance  with,  the law of the State of New York,  except to the
extent that the validity or perfection of the assignment and security  interests
hereunder in respect of any  Intellectual  Property  Collateral  are governed by
federal law and except to the extent that Assignee  shall have greater rights or
remedies  under federal law, in which case such choice of New York law shall not
be deemed to deprive  Assignee of such rights and  remedies as may be  available
under federal law.

         SECTION 14  AMENDMENT.  This Agreement shall  not be amended  except by
the written agreement of the parties.

         SECTION 15  SEVERABILITY.  Whenever  possible,  each  provision of this
Agreement shall be interpreted in such manner as to be effective and valid under
all  applicable  laws  and  regulations.  If,  however,  any  provision  of this
Agreement  shall be prohibited by or invalid under any such law or regulation in
any  jurisdiction,  it shall,  as to such  jurisdiction,  be deemed  modified to
conform to the minimum  requirements  of such law or regulation,  or, if for any
reason it is not deemed so modified, it shall be ineffective and invalid only to
the extent of such  prohibition  or invalidity  without  affecting the remaining
provisions of this Agreement, or the validity or effectiveness of such provision
in any other jurisdiction.

         SECTION 16  COUNTERPARTS.  This Agreement may be executed in any number
of counterparts and by different parties hereto in separate  counterparts,  each
of which when so  executed  shall be deemed to be an  original  and all of which
taken together shall constitute but one and the same agreement.

         SECTION 17  TERMINATION.  Upon payment and  performance  in full of all
Obligations,  this Agreement shall terminate and Assignee shall promptly execute
and deliver to Assignor such documents and instruments  reasonably  requested by
Assignor as shall be necessary to evidence termination of all security interests
given  by  Assignor  to  Assignee  hereunder,  including  cancellation  of  this
Agreement by written notice from Assignee to the PTO;  PROVIDED,  HOWEVER,  that
the  obligations  of  Assignor  under  Section  11  hereof  shall  survive  such
termination.

         SECTION 18  SECURITY AGREEMENT.  Assignor  acknowledges that the rights
and  remedies  of  Assignee  with  respect  to  the  security  interests  in the
Intellectual  Property Collateral granted hereby are more fully set forth in the
Security  Agreement  [and the other  Documents] and all such rights and remedies
are cumulative.

         SECTION 19  NO INCONSISTENT REQUIREMENTS.  Assignor  acknowledges  that
this Agreement and the Security  Agreement may contain covenants and other terms
and provisions  variously stated regarding the same or similar matters,  and the
Assignor agrees that all such covenants, terms and provisions are cumulative and
all shall be performed and satisfied in accordance with their respective terms.




                                       7.
<PAGE>


         IN  WITNESS  WHEREOF,  the  parties  hereto  have  duly  executed  this
Agreement, as of the date first above written.



                                       NORTH AMERICAN VACCINE, INC.

                                       By /s/ Lawrence J. Hineline
                                          ---------------------------------
                                             Title: Vice President Finance

                                       10150 Old Columbia Road
                                       Columbia, Maryland  21046

                                       Attn: Vice President Finance
                                             ------------------------------
                                       Fax:  (410) 309-4077
                                             ------------------------------


                                       BAXTER INTERNATIONAL, INC.

                                       By /s/ Steven J. Meyer
                                          ---------------------------------
                                             Title: Corp. Treasurer





                                       8.

<PAGE>



STATE OF CALIFORNIA                   )
                                      ) ss
COUNTY OF ____________________________)


         On ___________ , before me,  _____________,  Notary Public,  personally
appeared ___________________________, personally known to me (or proved to me on
the basis of  satisfactory  evidence) to be the person(s)  whose name(s)  is/are
subscribed to the within  instrument  and  acknowledged  to me that  he/she/they
executed  the  same  in  his/her/their  authorized  capacity(ies),  and  that by
his/her/their  signature(s) on the instrument the person(s),  or the entity upon
behalf of which the person(s) acted, executed the instrument.

         WITNESS my hand and official seal.



                                              ------------------------------
                                              Signature

[SEAL]



                                       9.
<PAGE>




STATE OF CALIFORNIA        )
                           ) ss
COUNTY OF _________________)


         On ___________ , before me,  _____________,  Notary Public,  personally
appeared ___________________________, personally known to me (or proved to me on
the basis of  satisfactory  evidence) to be the person(s)  whose name(s)  is/are
subscribed to the within  instrument  and  acknowledged  to me that  he/she/they
executed  the  same  in  his/her/their  authorized  capacity(ies),  and  that by
his/her/their  signature(s) on the instrument the person(s),  or the entity upon
behalf of which the person(s) acted, executed the instrument.

         WITNESS my hand and official seal.



                                                -------------------------------
                                                Signature

[SEAL]



                                      10.


<PAGE>

<TABLE>
<CAPTION>

                                                                 SCHEDULE A
- ------------------------------------------------------------------------------------------------------------------------------------
                                                 PATENTS AND PATENT APPLICATIONS OF ASSIGNOR

- ------------------------------------------------------------------------------------------------------------------------------------
ISSUED U.S. PATENTS
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                               <C>                <C>                <C>                  <C>                   <C>
Method for the High Level         Blake, et al.      NVX                08/798,760           February 11, 1997     Notice of
Expression, Purification and                         (co-exclusive      (Notice of Allowance                       Allowance issued
Refolding of the Outer Membrane                      license with PMC)  issued Jan. 1999)                          January 1999
Group B Porin Proteins                                                                                             (fee paid April
                                                                                                                   1999)
- ------------------------------------------------------------------------------------------------------------------------------------
Method for the High Level         Blake, et al.      NVX & Rockefeller  5,439,808            August 8, 1995        Patent
Expression, Purification and                         University
Refolding of the Outer Membrane                      (co-exclusive
Group B Porin Proteins from                          license with PMC)
Neisseria Meningitidis
- ------------------------------------------------------------------------------------------------------------------------------------
Method for the High Level         Blake, et al.      NVX                5,747,287            May 5, 1998           Patent
Expression, Purification and                         (co-exclusive
Refolding of the Outer Membrane                      license with PMC)
Group B Porin Proteins from
Neisseria Meningitidis
- ------------------------------------------------------------------------------------------------------------------------------------
Group A Streptococcal             Blake et al.       NVX & Rockefeller  5,866,135            February 2, 1999      Patent
Polysaccharide Immunogenic                           University
Compositions and Methods
- ------------------------------------------------------------------------------------------------------------------------------------
Method for the High Level         Blake, et al.      NVX                5,879,686            March 9, 1999         Patent
Expression, Purification and                         (co-exclusive
Refolding of the Outer Membrane                      license with PMC)
Group B Porin Proteins from
Neisseria Meningitidis
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>

- ------------------------------------------------------------------------------------------------------------------------------------
U.S. PATENT APPLICATIONS
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                      <C>                     <C>           <C>                <C>                  <C>
Method for the High Level                Tai, et al.             NVX           08/096,181         July 23, 1993        Application
Expression, Purification and
Refolding of the Outer Membrane
Protein P2 from Haemophilus Type b
- ------------------------------------------------------------------------------------------------------------------------------------
Method for the High Level                Tai, et al.             NVX           08/449,358          May 24, 1995        Application
Expression, Purification and
Refolding of the Outer Membrane
Protein P2 from Haemophilus Type b
- ------------------------------------------------------------------------------------------------------------------------------------
Antigenic Group B Streptococcus         Michon, et al.           NVX           08/481,883          June 7, 1995        Application
Type II and Type III
Polysaccharide Fragments Having a
2,5-Anhydro-D-Mannose Terminal
Structure and Conjugate Vaccine
Thereof
- ------------------------------------------------------------------------------------------------------------------------------------
Direct Methods for Molar-Mass          Michon, D'Ambra           NVX           08/753,242       November 22, 1996      Application
Determination of Fragments of
Haemophilus Type b Capsular
Polysaccharides and Vaccine
Preparation
- ------------------------------------------------------------------------------------------------------------------------------------
Cloning of Non-IgA FC Binding             Tai, Blake             NVX           08/923,992       September 5, 1997      Application
Forms of the Group B Streptococcal
Beta Antigens
- ------------------------------------------------------------------------------------------------------------------------------------
Antigenic Group B Streptococcus         Michon, et al.           NVX           09/025,225       February 18, 1998      Application
Type II and Type III
Polysaccharide Fragments Having a
2,5-Anhydro-D-Mannose Terminal
Structure and Conjugate Vaccine
Thereof
- ------------------------------------------------------------------------------------------------------------------------------------

<PAGE>

- ------------------------------------------------------------------------------------------------------------------------------------
Immunogenic Conjugates Comprising       Blake, et al.            NVX           09/118/180         July 17, 1998        Application
A Group B Meningococcal Porin and
an H. Influenzae Polysaccharide
- ------------------------------------------------------------------------------------------------------------------------------------
Modified Immunogenic Pneumolysin       Minetti, et al.           NVX           09/120,044         July 21, 1998        Application
Compositions as Vaccines
- ------------------------------------------------------------------------------------------------------------------------------------
Group A Streptococcal                    Blake et al.           NVX &          09/207,188        December 8, 1998      Application
Polysaccharide Immunogenic                                   Rockefeller
Compositions and Methods                                     University
- ------------------------------------------------------------------------------------------------------------------------------------
Procedures for the Extraction and       Michon, Blake            NVX           09/221,620       December 23, 1998      Application
Isolation of Bacterial Capsular
Polysaccharides for Use as
Vaccines or Linked to Proteins as
Conjugate Vaccines
- ------------------------------------------------------------------------------------------------------------------------------------
Gram Positive Bacterial Antigens       Long-Rowe, Blake          NVX           09/399,220       September 17, 1999     Application
and Methods of Purification of the
Streptococcal C-Beta Protein
- ------------------------------------------------------------------------------------------------------------------------------------
Immunogenic Polysaccharide-Protein      Michon et al.            NVX           09/376,911        August 18, 1999       Application
Conjugate Useful as a Vaccine
Produced Via Conjugation Through a
CZ-3 N-Acyl Portion F A
Polysaccharide
- ------------------------------------------------------------------------------------------------------------------------------------

</TABLE>

                                      A-1.

<PAGE>

<TABLE>
<CAPTION>

- ---------------------------------------------------------------------------------------------------------------------------
                                                                 SCHEDULE B
- ---------------------------------------------------------------------------------------------------------------------------
                                                         U.S. TRADEMARKS OF ASSIGNOR
- ---------------------------------------------------------------------------------------------------------------------------
MARK                               STATUS              APPL NO./     APPL./REGIS. DATE        OWNER OF RECORD
                                                       REGIS. NO.
- ---------------------------------------------------------------------------------------------------------------------------
     REGISTERED U.S. TRADEMARKS
- ---------------------------------------------------------------------------------------------------------------------------
<S>                                <C>                 <C>           <C>                      <C>
Globe Design                       Registered          1,932,111     October 31, 1995         North American Vaccine, Inc.
- ---------------------------------------------------------------------------------------------------------------------------
AMVAX                              Registered          1,967,632     April 16, 1996           North American Vaccine, Inc.
- ---------------------------------------------------------------------------------------------------------------------------
TRINAVACEL                         Registered          2,101,121     September 30, 1997       American Vaccine Corporation
- ---------------------------------------------------------------------------------------------------------------------------
TRIVAX                             Registered          2,118,360     December 2, 1997         American Vaccine Corporation
- ---------------------------------------------------------------------------------------------------------------------------
NAVA                               Registered          2,267,812     August 3, 1999           American Vaccine Corporation
- ---------------------------------------------------------------------------------------------------------------------------
     PENDING U.S. TRADEMARK APPLICATIONS
- ---------------------------------------------------------------------------------------------------------------------------
THE IMPORTANCE OF OUR WORK         Pending             75/190,826    October 29, 1996         American Vaccine Corporation
GROWS BIGGER EVERY DAY
- ---------------------------------------------------------------------------------------------------------------------------
NEISVAC-C                          Pending             Not Avail.    August 26, 1999          American Vaccine Corporation
- ---------------------------------------------------------------------------------------------------------------------------
NEISIVA                            Pending             Not Avail.    August 26, 1999          American Vaccine Corporation
- ---------------------------------------------------------------------------------------------------------------------------
MENCIVA                            Pending             Not Avail.    August 26, 1999          American Vaccine Corporation
- ---------------------------------------------------------------------------------------------------------------------------
</TABLE>

                                      B-1.


                                    GUARANTY

      FOR VALUE RECEIVED, the sufficiency of which is hereby acknowledged, and,
in consideration of any credit and/or financial accommodation heretofore or
hereafter from time to time made or granted to North American Vaccine, Inc., a
Canadian corporation ("BORROWER"), by BANK OF AMERICA, N.A. and any other
subsidiaries or affiliates of BankAmerica Corporation and its successors and
assigns (collectively "LENDER"), BAXTER INTERNATIONAL INC., a Delaware
corporation (the "GUARANTOR") hereby furnishes its guaranty of the Guaranteed
Obligations (as hereinafter defined) as follows:

      1.  GUARANTY. Guarantor hereby absolutely and unconditionally guarantees,
as a guarantee of payment and not merely as a guarantee of collection, prompt
payment when due, whether at stated maturity, upon acceleration or otherwise,
and at all times thereafter, of any and all existing and future indebtedness and
liabilities of every kind, nature and character, direct or indirect, absolute or
contingent, liquidated or unliquidated, voluntary or involuntary, of Borrower to
Lender arising under that certain letter loan agreement dated November 1, 1999
between Borrower and Lender (the "BORROWER CREDIT AGREEMENT") and all
instruments, agreements and other documents (including without limitation the
Security Agreement and the IP Security Agreement) of every kind and nature now
or hereafter executed in connection with the Borrower Credit Agreement
(including all renewals, extensions and modifications thereof and all costs,
structuring fees, attorneys' fees and expenses incurred by Lender in connection
with the collection or enforcement thereof) (collectively, the "GUARANTEED
OBLIGATIONS"). Lender's books and records showing the amount of the Guaranteed
Obligations shall be admissible in evidence in any action or proceeding, and
shall be binding upon Guarantor and serve as a rebuttable presumption in favor
of Lender for the purpose of establishing the amount of the Guaranteed
Obligations, subject only to manifest error. This Guaranty shall not be affected
by the genuineness of the Borrower Credit Agreement or the validity, regularity
or enforceability of the Guaranteed Obligations or any instrument or agreement
evidencing any Guaranteed Obligations, or by the existence, validity,
enforceability, perfection, or extent of any collateral therefor, or by any fact
or circumstance relating to the Guaranteed Obligations which might otherwise
constitute a defense to the obligations of Guarantor under this Guaranty. The
obligations of Guarantor hereunder shall be limited to an aggregate amount equal
to the largest amount that would not render its obligations hereunder subject to
avoidance under Section 548 of the Bankruptcy Code (Title 11, United States
Code) or any comparable provisions of any applicable state law.

      2.  NO DEDUCTIONS. All payments by Guarantor hereunder shall be paid in
full, without setoff or counterclaim or any deduction or withholding whatsoever,
including, without limitation, for any and all present and future taxes. In the
event that Guarantor or Lender is required by law to make any such deduction or
withholding, Guarantor agrees to pay on behalf of Lender such amount directly to
the appropriate person or entity, or if the Guarantor cannot legally comply with
the foregoing, Guarantor shall pay to Lender such additional amounts as will
result in the receipt by Lender of the full amount payable hereunder. Guarantor
shall promptly provide Lender with evidence of payment of any such amount made
on Lender's behalf.



<PAGE>

      3.  NO TERMINATION. This Guaranty is a continuing and irrevocable guaranty
of all Guaranteed Obligations now or hereafter existing and shall remain in full
force and effect until all Guaranteed Obligations and any other amounts payable
under this Guaranty are indefeasibly paid and performed in full and any
commitments of Lender or facilities provided by Lender with respect to the
Guaranteed Obligations are terminated.

      4.  WAIVER OF NOTICES. Guarantor waives notice of the acceptance of this
Guaranty and of the extension or continuation of the Guaranteed Obligations or
any part thereof, subject to the provisions of Section 6. Guarantor further
waives presentment, protest, notice, dishonor or default, demand for payment and
any other notices to which Guarantor might otherwise be entitled as a condition
to the satisfaction of its obligations hereunder; provided that Lender shall
provide notice of any Event of Default (as defined in the Borrower Credit
Agreement) in accordance with the terms of Section 23 hereof.

      5.  SUBROGATION. Guarantor shall exercise no right of subrogation,
contribution or similar rights with respect to any payments it makes under this
Guaranty until (a) all of the Guaranteed Obligations and any amounts payable
under this Guaranty are indefeasibly paid and performed in full and any
commitments of Lender or facilities provided by Lender with respect to the
Guaranteed Obligations are terminated or (b) Guarantor exercises Guarantor's
Call Option (or Lender exercises Lender's Put Option) in accordance with and as
more specifically described in Section 23 hereof. If any amounts are paid to
Guarantor in violation of the foregoing limitation, then such amounts shall be
held in trust for the benefit of Lender and shall forthwith be paid to Lender to
reduce the amount of the Guaranteed Obligations, whether matured or unmatured.

      6.  WAIVER OF SURETYSHIP DEFENSES. Guarantor agrees that Lender may, at
any time and from time to time, and without notice to Guarantor, make any
agreement with Borrower or with any other person or entity liable on any of the
Guaranteed Obligations or providing collateral as security for the Guaranteed
Obligations, for the extension, renewal, payment, compromise, discharge or
release of the Guaranteed Obligations, or for any modification or amendment of
the terms thereof or of any instrument or agreement evidencing the Guaranteed
Obligations or the provision of collateral, all without in any way impairing,
releasing, discharging or otherwise affecting the obligations of Guarantor under
this Guaranty; provided that Lender shall not (a) extend the final maturity date
of the Guaranteed Obligations or any portion thereof, (b) reduce the rate or
extend the time for payment of interest, (c) waive the principal amount of any
Loan, (d) increase the Commitment or (e) release all or substantially all of any
collateral given to secure the Guaranteed Obligations, without in each case the
written consent of Guarantor. Guarantor waives any defense arising by reason of
any disability or other defense of Borrower or any other guarantor, or the
cessation from any cause whatsoever of the liability of Borrower, or any claim
that Guarantor's obligations exceed or are more burdensome than those of
Borrower and waives the benefit of any statute of limitations affecting the
liability of Guarantor hereunder. Guarantor waives any right to enforce any
remedy which Lender now has or may hereafter have against Borrower and waives
any benefit of and any right to participate in any security now or hereafter
held by Lender, subject to the provisions of Sections 23 and 24 hereof. Further,
Guarantor consents to the taking of, or failure to take, any action which might
in any manner or to any extent vary the risks of Guarantor under this Guaranty


                                       2
<PAGE>


or which, but for this provision, might operate as a discharge of Guarantor.

      7.  EXHAUSTION OF OTHER REMEDIES NOT REQUIRED. The obligations of
Guarantor hereunder are those of primary obligor, and not merely as surety, and
are independent of the Guaranteed Obligations. Guarantor waives diligence by
Lender and action on delinquency in respect of the Guaranteed Obligations or any
part thereof, including, without limitation any provisions of law requiring
Lender to exhaust any right or remedy or to take any action against Borrower,
any other guarantor or any other person, entity or property before enforcing
this Guaranty against Guarantor.

      8.  REINSTATEMENT. Notwithstanding anything in this Guaranty to the
contrary, this Guaranty shall continue to be effective or be reinstated, as the
case may be, if at any time any payment of any portion of the Guaranteed
Obligations is revoked, terminated, rescinded or reduced or must otherwise be
restored or returned upon the insolvency, bankruptcy or reorganization of
Borrower or any other person or entity or otherwise, as if such payment had not
been made and whether or not Lender is in possession of or has released this
Guaranty and regardless of any prior revocation, rescission, termination or
reduction.

      9.  SUBORDINATION. Guarantor hereby subordinates the payment of all
obligations and indebtedness of Borrower owing to Guarantor, whether now
existing or hereafter arising, including but not limited to any obligation of
Borrower to Guarantor as subrogee of Lender or resulting from Guarantor's
performance under this Guaranty, to the indefeasible payment in full of all
Guaranteed Obligations. If Lender so requests, any such obligation or
indebtedness of Borrower to Guarantor shall be enforced and performance received
by Guarantor as trustee for Lender and the proceeds thereof shall be paid over
to Lender on account of the Guaranteed Obligations, but without reducing or
affecting in any manner the liability of Guarantor under this Guaranty.

      10. INFORMATION. Guarantor agrees to furnish promptly to Lender any and
all financial or other information regarding Guarantor or its property as Lender
may reasonably request in writing; provided, Guarantor shall not be obligated to
furnish or deliver information to Lender in addition to the requirements set
forth in the Existing Credit Agreement (as defined in Section 20 hereof).

      11. STAY OF ACCELERATION. In the event that acceleration of the time for
payment of any of the Guaranteed Obligations is stayed, upon the insolvency,
bankruptcy or reorganization of Borrower or any other person or entity, or
otherwise, all such amounts shall nonetheless be payable by Guarantor
immediately upon demand by Lender.

      12. EXPENSES. Guarantor shall pay on demand all out-of-pocket expenses
(including reasonable attorneys' fees and expenses and the allocated cost and
disbursements of internal legal counsel) in any way relating to the enforcement
or protection of Lender's rights under this Guaranty, including any incurred in
the preservation, protection or enforcement of any rights of Lender in any case
commenced by or against Guarantor under the Bankruptcy Code (Title 11, United


                                       3
<PAGE>

States Code) or any similar or successor statute. The obligations of Guarantor
under the preceding sentence shall survive termination of this Guaranty.

      13. AMENDMENTS. No provision of this Guaranty may be waived, amended,
supplemented or modified, except by a written instrument executed by Lender and
Guarantor.

      14. NO WAIVER. No failure by Lender to exercise, and no delay in
exercising, any right, remedy or power hereunder shall operate as a waiver
thereof; nor shall any single or partial exercise of any right, remedy or power
hereunder preclude any other or further exercise thereof or the exercise of any
other right. The remedies herein provided are cumulative and not exclusive of
any remedies provided by law or in equity. The unenforceability or invalidity of
any provision of this Guaranty shall not affect the enforceability or validity
of any other provision herein.

      15. ASSIGNMENT; GOVERNING LAWS; JURISDICTION. This Guaranty shall (a) bind
Guarantor and its successors and assigns, PROVIDED that Guarantor may not assign
its rights or obligations under this Guaranty without the prior written consent
of Lender (and any attempted assignment without such consent shall be void), (b)
inure to the benefit of Lender and its successors and assigns and Lender may,
without notice to Guarantor and without affecting Guarantor's obligations
hereunder, assign or sell participations in the Guaranteed Obligations and this
Guaranty, in whole or in part, and (c) be governed by the internal laws of the
State of New York. Guarantor hereby irrevocably (i) submits to the non-exclusive
jurisdiction of any United States Federal or State court sitting in New York,
New York in any action or proceeding arising out of or relating to this
Guaranty, and (ii) waives to the fullest extent permitted by law any defense
asserting an inconvenient forum in connection therewith. Service of process by
Lender in connection with such action or proceeding shall be binding on
Guarantor if sent to Guarantor by registered or certified mail at its address
specified below. Guarantor agrees that Lender may disclose to any prospective
purchaser and any purchaser of all or part of the Guaranteed Obligations any and
all information in Lender's possession concerning Guarantor, this Guaranty and
any security for this Guaranty.

      16. CONDITION OF BORROWER. Guarantor acknowledges and agrees that it has
the sole responsibility for, and has adequate means of, obtaining from Borrower
such information concerning the financial condition, business and operations of
Borrower as Guarantor requires, and that Lender has no duty, and Guarantor is
not relying on Lender at any time to disclose to Guarantor any information
relating to the business, operations or financial condition of Borrower.

      17. SETOFF. If and to the extent any payment is not made when due
hereunder, Lender may setoff and charge from time to time any amount so due
against any or all of Guarantor's accounts or deposits with Lender.

      18. OTHER GUARANTEES. Unless otherwise agreed by Lender and Guarantor in
writing, this Guaranty is not intended to supersede or otherwise affect any
other guaranty now or hereafter given by Guarantor for the benefit of Lender or
any term or provision thereof.


                                       4
<PAGE>


      19. REPRESENTATIONS AND WARRANTIES. Guarantor represents and warrants that
(i) it is duly organized and in good standing under the laws of the jurisdiction
of its organization and has full capacity and right to make and perform this
Guaranty, and all necessary authority has been obtained; (ii) this Guaranty
constitutes its legal, valid and binding obligation enforceable in accordance
with its terms; (iii) the making and performance of this Guaranty does not and
will not violate the provisions of any applicable law, regulation or order, and
does not and will not result in the breach of, or constitute a default or
require any consent under, any agreement, instrument, or document to which it is
a party or by which it or any of its property may be bound or affected; (iv) all
consents, approvals, licenses and authorizations of, and filings and
registrations with, any governmental authority required under applicable law and
regulations for the making and performance of this Guaranty have been obtained
or made and are in full force and effect; (v) by virtue of its relationship with
Borrower, the execution, delivery and performance of this Guaranty is for the
direct benefit of Guarantor and it has received adequate consideration for this
Guaranty; and (vi) the financial information that has been delivered to Lender
by or on behalf of Guarantor is complete and correct in all respects and
accurately presents the financial condition and the operational results of
Guarantor and since the date of the most recent financial statements delivered
to Lender, there has been no material adverse change in the financial or
operational condition of Guarantor.

      20. INCORPORATION OF COVENANTS. Reference is made to that certain Credit
Agreement (Facility A) dated as of November 24, 1998 (as amended or modified
prior to the date of the Guaranty, the "EXISTING CREDIT AGREEMENT") among
Guarantor, the financial institutions named therein, Bank of America, N.A.
(formerly Bank of America National Trust and Saving Association) and The Chase
Manhattan Bank, as Co-Arrangers, and The First National Bank of Chicago, as
administrative agent. Reference is further made to the covenants contained in
Article VIII of the Existing Credit Agreement (hereinafter referred to as the
"INCORPORATED COVENANTS"). So long as principal of and interest on any Loan (as
defined in the Borrower Credit Agreement) or any other amount payable under the
Borrower Credit Agreement or under any other Loan Document remains unpaid or
unsatisfied or the Commitment (as defined in the Borrower Credit Agreement) has
not been terminated, Guarantor shall comply with the Incorporated Covenants, it
being agreed that such covenants and agreements shall survive any termination,
cancellation or discharge of the Existing Credit Agreement. Guarantor agrees
with Lender that the Incorporated Covenants (and all other relevant provisions
of the Existing Credit Agreement related thereto, including without limitation
all exhibits, schedules and the defined terms contained in Section 1.01 thereof,
which are used in the Incorporated Covenants) are hereby incorporated by
reference into this Guaranty to the same extent and with the same effect as if
set forth fully herein and shall inure to the benefit of Lender, without giving
effect to any waiver, amendment, modification or replacement of the Existing
Credit Agreement or any term or provision of the Incorporated Covenants
occurring subsequent to the date of this Guaranty, except to the extent
otherwise specifically provided for in the following paragraph of this Section.

      In the event a waiver is granted under the Existing Credit Agreement or an
amendment or modification is executed with respect to the Existing Credit
Agreement, and such waiver, amendment and/or modification affects the


                                       5
<PAGE>

Incorporated Covenants, then such waiver, amendment or modification shall be
effective with respect to the Incorporated Covenants as incorporated by
reference into this Guaranty only if consented to in writing by the Lender. In
the event of any replacement of the Existing Credit Agreement with a similar
credit facility (the "NEW FACILITY") the covenants contained in the New Facility
which correspond to the covenants contained in Sections 8.01 and 8.02,
respectively, of the Existing Credit Agreement shall become the Incorporated
Covenants hereunder only if consented to in writing by Lender and, if such
consent is not granted or if the Existing Credit Agreement is terminated and not
replaced, then covenants contained in Sections 8.01 and 8.02, respectively, of
the Existing Credit Agreement (together with any modifications or amendments
approved in accordance with this paragraph) shall continue to be the
Incorporated Covenants hereunder.

      21. GUARANTY EVENTS OF DEFAULT. Each of the following shall be a "Guaranty
Event of Default" for purposes of this Guaranty:

      (a)            Any "Event of Default" specified in Section 9.01 of the
                Existing Credit Agreement occurs and is continuing, without
                giving effect to any waiver thereof pursuant to the Existing
                Credit Agreement; or
      (b)            Guarantor fails to perform or observe any other covenant or
                agreement  (not  specified  in  (a)  above)  contained  in  this
                Guaranty or any Loan Document (as defined in the Borrower Credit
                Agreement)  on its part to be performed or observed  (including,
                without limitation,  the failure of Guarantor to comply with any
                of its payments  obligations  in  accordance  with and under the
                terms of this Guaranty); or
      (c)            Any representation or warranty in this Guaranty or in any
                certificate, agreement, instrument or other document made or
                delivered by Guarantor pursuant to or in connection with this
                Guaranty or the Borrower Loan Agreement proves to have been
                incorrect when made or deemed made.


      22. WAIVER OF JURY TRIAL; FINAL AGREEMENT. TO THE EXTENT ALLOWED BY
APPLICABLE LAW, GUARANTOR AND LENDER EACH WAIVE TRIAL BY JURY WITH RESPECT TO
ANY ACTION, CLAIM, SUIT OR PROCEEDING ON OR ARISING OUT OF THIS GUARANTY. THIS
GUARANTY REPRESENTS THE FINAL AGREEMENT BETWEEN THE PARTIES AND MAY NOT BE
CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS, OR SUBSEQUENT ORAL
AGREEMENTS BETWEEN THE PARTIES. THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN
THE PARTIES.

      23. CALL/PUT PROVISIONS.

      (a) GUARANTOR'S CALL OPTION. Guarantor (or any Affiliate identified by
      Guarantor) shall have the right, upon three Business Days' prior written
      notice to Lender, to purchase all (but not less than all) of Lender's
      rights, interests and obligations in and to the Borrower Credit Agreement
      at par value and subject in all cases to the representations, warranties


                                       6
<PAGE>

      and disclaimers set forth in Section 24 hereof (as set forth herein,
      "GUARANTOR'S CALL OPTION"). Notwithstanding (I) Guarantor's exercise of
      its call option pursuant to this section or (II) any other provision of
      this Guaranty to the contrary, the Guaranty shall continue to be effective
      or be reinstated, as the case may be, if at any time any payment of any
      portion of the Guaranteed Obligations received by Lender is (x) revoked,
      terminated, rescinded or reduced or (y) subject to a request or an action
      filed by Borrower, or any of its successors in bankruptcy (including a
      trustee or any official committee), seeking the return or restoration of
      any or all of such payment pursuant to the avoidance provisions of the
      United States Bankruptcy Code, specifically including but not limited to
      11 U.S.C. ss.ss. 544, 547, 548 and 550, as if such payment had not been
      made and whether or not Lender is in possession of or has released this
      Guaranty and regardless of any prior revocation, rescission, termination
      or reduction. Guarantor shall be responsible for all costs and expenses
      (including without limitation Breakage Costs) associated with Guarantor's
      exercise of its rights hereunder.

      (b) LENDER'S PUT OPTION. Upon the occurrence of any Event of Default and
      written notice thereof provided by Lender to Guarantor, Lender shall sell
      to Guarantor all (but not less than all) of Lender's rights, interests and
      obligations in and to the Borrower Credit Agreement at par value and
      subject in all cases to the representations, warranties and disclaimers
      set forth in Section 24 hereof (as set forth herein, "LENDER'S PUT
      OPTION"). Notwithstanding (I) Lender's exercise of its put option pursuant
      to this section or (II) any other provision of this Guaranty to the
      contrary, the Guaranty shall continue to be effective or be reinstated, as
      the case may be, if at any time any payment of any portion of the
      Guaranteed Obligations is (x) revoked, terminated, rescinded or reduced or
      (y) subject to a request or an action filed by Borrower, or any of its
      successors in bankruptcy (including a trustee or any official committee),
      seeking the return or restoration of any or all of such payment pursuant
      to the avoidance provisions of the United States Bankruptcy Code,
      specifically including but not limited to 11 U.S.C. ss.ss. 544, 547, 548
      and 550, as if such payment had not been made and whether or not Lender is
      in possession of or has released this Guaranty and regardless of any prior
      revocation, rescission, termination or reduction. Guarantor shall be
      responsible for all costs and expenses (including without limitation
      Breakage Costs) associated with Lender's exercise of its rights hereunder.

      PROVIDED, HOWEVER, that, (a) notwithstanding Borrower's and Guarantor's
good faith efforts, if the Guarantor and Borrower do not execute a definitive
agreement for the North American Vaccine Acquisition on or prior to November 16,
1999, and (b) between the date hereof and November 16, 1999, Borrower has not,
directly or indirectly solicited, initiated or encouraged (including by way of
furnishing or disclosing nonpublic information) any inquiries or the making or
any proposal or offer (including, without limitation, any offer to its
stockholders), with any third party other than Guarantor relating to any Company
Competing Transaction or knowingly encouraged or otherwise entered into or
maintained any discussions or negotiations with respect to any Company Competing
Transaction, or agreed or endorsed any agreement, arrangement or understanding
with respect to a Company Competing Transaction, or authorized or permitted any
representative of Borrower to take any such action, then Guarantor agrees that
it shall not, in connection with the exercise of Guarantor's Call Option or the

                                       7
<PAGE>

exercise of Lender's Put Option, commence the exercise of remedies set forth in
the Borrower Credit Agreement if Borrower repays all amounts owing under or in
connection with the Borrower Credit Agreement and any related agreements within
20 days thereafter. For purposes of this Guaranty, a "Company Competing
Transaction" shall mean any of the following involving Borrower:

           (i)     any merger, consolidation, share exchange, recapitalization,
business combination, material issuance of equity or other similar transaction;

           (ii)    any sale, lease, exchange, transfer or other disposition of
10% or more of the assets of Borrower and its subsidiaries taken as a whole in a
single transaction or series of related transactions;

           (iii)   any license, sublicense, sale or similar transaction,
arrangement or agreement with respect to any material patents, trademarks, trade
secrets, patent applications, know how or other intellectual property of
Borrower or any of its subsidiaries;

           (iv)    any tender offer or exchange offer for any of the outstanding
voting securities of Borrower;

           (v)     any acquisition by any person or group of persons of 10% or
more of the voting securities (or securities convertible or exchangeable
therefor)of Borrower; or

           (vi)    any public announcement of a proposal, plan or intention to
do any of the foregoing or any agreement to engage in any of the foregoing.

      24. ASSIGNMENT PROVISIONS. To the extent that Borrower's obligations under
the Borrower Credit Agreement are secured by a lien or pledge of collateral to
Lender in Borrower's property or assets (of whatever nature) (collectively,
"BORROWER COLLATERAL"), Lender hereby agrees that upon payment in full by
Guarantor of the Guaranteed Obligations (as determined by Lender), Lender shall,
if requested in writing by Guarantor, assign to Guarantor or its designee all or
a portion of Lender's rights (if any, and of whatever nature) in and to such
Borrower Collateral. Lender does not make, shall not be obligated to make nor
shall be deemed to have made any representation or warranty of any kind as to
the value of the Borrower Collateral or any portion thereof, including but not
limited to any representation or warranty with respect to the value of Lender's
Lien in such Borrower Collateral or the attachment, perfection or priority of
Lender's Lien with respect thereto. Lender hereby specifically disclaims any
such representations or warranties. Lender shall not warrant nor be obligated to
defend Lender's Lien or the attachment, perfection or priority of such Lien.
GUARANTOR HEREBY SPECIFICALLY ACKNOWLEDGES AND AGREES THAT LENDER DOES NOT MAKE,
SHALL NOT BE OBLIGATED TO MAKE NOR SHALL BE DEEMED TO HAVE MADE ANY
REPRESENTATION OR WARRANTY WITH RESPECT TO THE BORROWER COLLATERAL, INCLUDING
WITHOUT LIMITATION THE ATTACHMENT, PERFECTION OR PRIORITY OF LENDER'S LIEN WITH
RESPECT THERETO. Lender agrees to reasonably cooperate with Guarantor to execute
UCC assignments and such other legal documentation as may be necessary to effect


                                       8
<PAGE>

the purposes of this paragraph. Guarantor shall be responsible for the costs and
expenses (including without limitation reasonable attorneys' fees and expenses
and the allocated cost and disbursements of internal legal counsel) associated
with the assignment and/or transfer by Lender of its rights with respect to the
Borrower Collateral in accordance with the terms hereof.

      25. DEFINED TERMS. Capitalized terms used herein but not otherwise defined
shall have the respective meaning set forth in the Borrower Credit Agreement.



                                       9
<PAGE>



Duly executed and delivered under seal this 1st day of November, 1999.


                                          BAXTER INTERNATIONAL INC.


                                          By:  /s/ Steven J. Meyer
                                               -----------------------
                                               Name:  Steven J. Meyer
                                               Title: Corp. Treasurer


Acknowledged and Agreed:

BANK OF AMERICA, N.A.

By:    /s/ Lawrence J. Gordon
       ----------------------

Name:  Lawrence J. Gordon

Title: Vice President


Acknowledged and Agreed:

NORTH AMERICAN VACCINE, INC.

By:    /s/ Randal Chase
       -----------------------

Name:  Randal Chase, Ph.D.
       -------------------
Title: Chief Executive Officer & President
       -----------------------------------





                                       10



                             REIMBURSEMENT AGREEMENT


         THIS REIMBURSEMENT AGREEMENT (this "Agreement") dated as of November 1,
1999, is made by and among NORTH AMERICAN VACCINE,  INC., a Canadian corporation
("Borrower"), and BAXTER INTERNATIONAL INC., a  Delaware corporation ("Baxter").

                                 R E C I T A L S

         A. Borrower  and  Bank of  America,  N.A.  ("Bank")  are  party to that
certain loan  agreement  dated as of November 1, 1999 (as  amended,  modified or
restated  from time to time the "Loan  Agreement"),  pursuant  to which Bank has
agreed to make a revolving  credit  facility  available to Borrower.  Borrower's
obligations  under the Loan  Agreement  are  secured,  in part,  by liens on the
collateral  described in that certain Security Agreement dated as of November 1,
1999,  and that certain Patent and Trademark  Assignment and Security  Agreement
dated as of November 1, 1999 (collectively, the "Bank Security Agreements"). The
Loan Agreement, Bank Security Agreements,  notes, financing statements and other
collateral  documents  related  thereto  are  referred  to  herein  as the "Loan
Documents."

         C. Borrower has requested in connection with such financing that Baxter
guaranty  certain  obligations of Borrower under the Loan Agreement.  Baxter has
entered into that  certain  Guaranty  dated as of November 1, 1999,  in favor of
Bank (the "Guaranty") to guarantee such obligations of Borrower.

         D. Borrower  and  Baxter   have  a  substantial  business  relationship
independent of the Guaranty and Baxter anticipates  obtaining continued benefits
from that  relationship as a result of Borrower's  access to financing under the
Loan Documents.

         E. In consideration of Baxter entering into the Guaranty,  Borrower has
agreed to  indemnify  and  reimburse  Baxter if  Baxter is  required  to pay any
amounts  under  or in  connection  with the  Guaranty.  The  obligations  of the
Borrower  pursuant  to this  Agreement  shall be secured  by certain  collateral
described in that certain  Security  Agreement dated as of November 1, 1999, and
that certain Patent and Trademark  Assignment and Security Agreement dated as of
November 1, 1999 (collectively, the "Baxter Security Agreements").

         NOW, THEREFORE, in consideration  of  the  mutual  covenants  contained
herein, the parties agree as follows:

         1. INDEMNIFICATION BY BORROWER.



                                       1.
<PAGE>

               1.1  Borrower  undertakes  (to the fullest  extent  permitted  by
applicable  law) to indemnify  Baxter and its  affiliates  and their  respective
directors,  officers,  employees  and  agents  (collectively,  the  "Indemnified
Parties") from, and hold said Indemnified Parties harmless against,  any and all
losses,  liabilities,  claims, actions,  proceedings,  suits, damages, costs and
expenses  of any nature  whatsoever  in  connection  with or arising  out of the
Guaranty (collectively, "Losses"), including, without limitation, the reasonable
attorneys' fees and disbursements  (other than attorneys' fees and disbursements
incurred  in  connection  with  the  preparation  of the  Guaranty  and  related
documents) (the "Indemnified Matters").

               1.2  If any Indemnified  Party is  presented  with  any  claim in
writing or any action or proceeding is formally commenced against an Indemnified
Party  which  may  give  rise  to a right  of  indemnification  hereunder,  such
Indemnified  Party shall  promptly  give  written  notice  thereof to  Borrower.
Borrower  may, by delivery of written  notice to such  Indemnified  Party within
thirty (30) days following receipt of such notice,  elect to contest such claim,
action or proceeding in such manner as it deems necessary or advisable, and each
Indemnified  Party  shall  cooperate  with  Borrower  in  connection  therewith.
Notwithstanding  Borrower's  election  to  contest  any such  claim,  action  or
proceeding, if the Indemnified Party reasonably determines that it needs its own
counsel (separate from Borrower's counsel), the Indemnified Party shall have the
right to  participate in its own defense and to have legal counsel of its choice
and  participate in such defense,  at the  Indemnified  Party's cost and expense
(unless such legal counsel is retained as a result of a representation  conflict
with Borrower's counsel),  without in any way impairing  Borrower's  obligations
under this Section 1 to indemnify and hold harmless such Indemnified  Party from
all  Indemnified  Matters.  In the event of any payment by an Indemnified  Party
under the  Guaranty,  Borrower  shall  immediately  upon demand by the  relevant
Indemnified  Party  reimburse  the  Indemnified  Party  for such  payment,  plus
interest  from  the  date  of  payment  by  Indemnified  Party  to the  date  of
reimbursement at an annual rate equal to _____________ percent or, if lower, the
highest rate  permitted by law.  Nothing in this  Agreement  shall  restrict any
Indemnified Party from making any payment under the Guaranty without  contesting
the necessity of such payment if the  Indemnified  Party in good faith  believes
that such payment is due, and any such payment by an Indemnified  Party shall be
subject to reimbursement by Borrower as provided above.

         2.  REPRESENTATIONS  AND  WARRANTIES.  Borrower  hereby  represents and
warrants as follows:

               2.1 ORGANIZATIONAL  STATUS.   Borrower  is  a  corporation   duly
organized,  validly existing and in good standing under the laws of the State of
Canada.

               2.2 POWER AND AUTHORITY. Borrower has full power and authority to
enter into this  Agreement  and perform all of its  obligations  hereunder.  The
execution,  delivery  and  performance  by  Borrower  of this  Agreement  do not
contravene Borrower's charter or bylaws or violate any provision of any statute,
law, rule, regulation,  judgment, order or decree and will not conflict with, or
constitute a breach or default under, any indenture, loan agreement, contract or
other  agreement or instrument to which Borrower is a party or by which Borrower
or any of its property is bound.



                                       2.
<PAGE>

               2.3 GOVERNMENTAL  AUTHORIZATION.  No  authorization,  consent  or
approval  or other  action  by,  and no  notice  to or other  filing  with,  any
governmental  authority or regulatory body is required for the due execution and
delivery by Borrower of this Agreement or the  performance by Borrower of any of
its obligations hereunder.

         3. COVENANTS. Borrower covenants that until Baxter is fully released
from the Guaranty and all indemnity obligations of Borrower under Section 1
above have been met with respect to then existing Losses, Borrower will comply
with Sections 3 and 4 of the Loan Agreement and, if for any reason the Loan
Agreement is terminated or otherwise ceases to be in effect, to comply with the
provisions of Sections 3 and 4 thereof as last in effect.

         4. EXPENSES. Borrower will on demand pay to Baxter the amount of any
and all reasonable costs and expenses, including but not limited to the
reasonable fees and disbursements of its counsel and of any experts or agents,
which Baxter may incur in connection with (i) the exercise or enforcement by
Baxter of any of its rights or remedies hereunder, or (ii) any failure by
Borrower to perform any of its obligations hereunder.

         5. ASSIGNMENT. Without the other party's prior written consent, no
party may assign or delegate any of its rights or obligations hereunder, except
that Baxter may assign its rights (including indemnity rights under Section 1)
as part of any merger, consolidation or restructuring of Baxter or as part of a
transfer of a substantial portion of Baxter's assets. If at any time or times by
sale, assignment, negotiation, pledge or otherwise, Baxter transfers any of the
Obligations (as defined in the Loan Agreement), such transfer shall carry with
it Baxter's rights and remedies under this Agreement with respect to the
Obligations transferred, and the transferee shall become vested with such rights
and remedies whether or not they are specifically referred to in the transfer.
If and to the extent Baxter retains any other Obligations, Baxter shall continue
to have the rights and remedies herein set forth with respect thereto.

         6.  NOTICES.  Any  notice or other communication required or desired to
be served, given or delivered  hereunder shall be  in writing to  the parties at
the addresses set forth below  and shall be deemed to have  been validly served,
given or delivered if given in accordance with the notice provisions of the Loan
Agreement as then in effect or, if the Loan Agreement is not then in effect,  in
accordance with the notice provisions of the Loan Agreement last in effect.

         7.  GOVERNING  LAW. This  Agreement  shall be governed by and construed
under the laws of the State of New York  applicable to contracts  made and to be
performed  in the State of New York.  This  Agreement  shall be given a fair and
reasonable  construction  in  accordance  with the  intention of the parties and
without  regard  to, or aid of,  any  provision  of law which  provides  that an
agreement shall be construed against the drafter thereof.

         8.  SECURITY.  Borrower's  obligations  under this  Agreement  shall be
secured by each of the Baxter Security Agreements.

         9.  MISCELLANEOUS.  Neither this Agreement nor any provision hereof may
be changed,  waived,  discharged or terminated orally, but only by an instrument
in writing signed by the party against which enforcement of the change,  waiver,
discharge  or  termination  is sought.  This  Agreement  shall be  binding  upon



                                       3.
<PAGE>

Borrower and its  successors  and  assigns,  and all persons  claiming  under or
through  Borrower or any of its  successors  or assigns,  and shall inure to the
benefit of and be enforceable by Baxter and its successors and assigns.



                                       4.

<PAGE>


         IN WITNESS WHEREOF,  the parties have executed this Agreement as of the
day and year first above written.

                                      NORTH AMERICAN VACCINE, INC.


                                      By     /s/ Randal Chase
                                             -------------------------------

                                      Name:  Randal Chase, Ph.D.
                                             -------------------

                                      Title: Chief Executive Officer & President
                                             -----------------------------------







                                       BAXTER INTERNATIONAL, INC.

                                       By:     /s/ Steven J. Meyer
                                               ---------------------------

                                       Name:   Steven J. Meyer
                                               ---------------------------

                                       Title:  Corp. Treasurer
                                               ---------------------------



                   [Signature Page to Reimbursement Agreement]

<TABLE> <S> <C>


<ARTICLE>                     5
<LEGEND>
     THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
     COMPANY'S QUARTERLY REPORT ON FORM 10-Q FOR THE NINE MONTHS ENDED
     SEPTEMBER 30, 1999 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
     FINANCIAL STATEMENTS.
</LEGEND>
<CIK>                                          0000856573
<NAME>                                         North American Vaccine, Inc.
<MULTIPLIER>                                   1,000

<S>                                            <C>
<PERIOD-TYPE>                                  9-MOS
<FISCAL-YEAR-END>                              DEC-31-1999
<PERIOD-START>                                 JAN-01-1999
<PERIOD-END>                                   SEP-30-1999
<CASH>                                               1,917
<SECURITIES>                                             0
<RECEIVABLES>                                        1,729
<ALLOWANCES>                                             0
<INVENTORY>                                          4,457
<CURRENT-ASSETS>                                     8,913
<PP&E>                                              59,948
<DEPRECIATION>                                      38,872
<TOTAL-ASSETS>                                      37,037
<CURRENT-LIABILITIES>                               18,735
<BONDS>                                            100,326
                                    0
                                          6,538
<COMMON>                                            90,473
<OTHER-SE>                                       (180,237)
<TOTAL-LIABILITY-AND-EQUITY>                        37,037
<SALES>                                              3,589
<TOTAL-REVENUES>                                     7,626
<CGS>                                                    0
<TOTAL-COSTS>                                       36,233
<OTHER-EXPENSES>                                         0
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<INTEREST-EXPENSE>                                   6,857
<INCOME-PRETAX>                                   (34,066)
<INCOME-TAX>                                             0
<INCOME-CONTINUING>                               (34,066)
<DISCONTINUED>                                           0
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<CHANGES>                                                0
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<EPS-BASIC>                                       (1.05)
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</TABLE>


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