NORTH AMERICAN VACCINE INC
10-Q, 1999-08-11
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

                                    FORM 10-Q

(MARK ONE)

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

                        FOR THE QUARTERLY PERIOD ENDED JUNE 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 AUGUST 3, 1999 - 32,843,169 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...  25



PART II.   OTHER INFORMATION


Item 1.    Legal Proceedings............................................  27

Item 2.    Changes in Securities and Use of Proceeds....................  27

Item 6.    Exhibits and Reports on Form 8-K.............................  28


SIGNATURES .............................................................  29


                                       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 six
months ended June 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)                    JUNE 30,      DECEMBER 31,
                                                                     1999            1998
                                                                --------------  --------------
ASSETS                                                            (UNAUDITED)

CURRENT ASSETS:
<S>                                                             <C>                <C>

  Cash and cash equivalents                                        $   2,120       $  22,953
  Accounts receivable                                                  1,144           1,625
  Inventory                                                            4,730           4,067
  Prepaid expenses and other current assets                            1,034             998
                                                                 --------------  --------------
          Total current assets                                         9,028          29,643

Property, plant and equipment, net                                    24,264          25,315
Investment in affiliate, at market                                        -            1,554
Deferred financing costs, net                                          2,033           2,505
Cash restricted for lease obligation                                   4,052           4,877
Other assets                                                             739             631
                                                                 --------------  --------------
     TOTAL ASSETS                                                  $  40,116       $  64,525
                                                                 ==============  ==============

LIABILITIES AND SHAREHOLDERS' DEFICIT

CURRENT LIABILITIES:
  Accounts payable                                                 $   4,103       $   3,881
  Deferred revenue                                                        62             850
  Obligation under capital leases, current portion                     1,883           1,754
  Other current liabilities                                            5,667           5,848
                                                                 --------------  --------------
         Total current liabilities                                    11,715          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                1,510           2,356
Deferred rent credits, net of current portion                            147              76
                                                                 --------------  --------------
     Total liabilities                                               113,698         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 32,843,169 shares at June 30, 1999 and
     32,216,096 shares at December 31, 1998                           90,387          80,824
  Additional paid-in capital                                          11,956          11,956
  Cumulative comprehensive income excluded from net loss                   -             926
  Accumulated deficit                                               (182,463)       (159,218)
                                                                 --------------  --------------
         Total shareholders' deficit                                 (73,582)        (58,974)
                                                                 --------------  --------------
     TOTAL LIABILITIES AND SHAREHOLDERS' DEFICIT                   $  40,116       $  64,525
                                                                 ==============  ==============


The accompanying notes are an integral part of these condensed consolidated financial statements.

</TABLE>


                                                            4

<PAGE>

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


                                                       THREE MONTHS ENDED              SIX MONTHS ENDED
                                                            JUNE 30,                       JUNE 30,
                                                       1999         1998           1999        1998
                                                  ------------- ------------   ----------- -----------
<S>                                                <C>           <C>            <C>         <C>

 REVENUES:
      Product sales                                   $   1,257    $      81     $   2,416   $     344
      Marketing, research and development agreements        423        1,148           788       1,719
                                                   ------------- ------------   ----------- -----------
           Total revenues                                 1,680        1,229         3,204       2,063
                                                   ------------- ------------   ----------- -----------

OPERATING EXPENSES:
     Production                                           5,582        4,185        10,372       9,166
     Research and development                             3,857        4,490         7,625       8,533
     Selling, general and administrative                  2,571        2,308         5,120       4,815
                                                   ------------- ------------   ----------- -----------
           Total operating expenses                      12,010       10,983        23,117      22,514
                                                   ------------- ------------   ----------- -----------

OPERATING LOSS                                         (10,330)      (9,754)      (19,913)    (20,451)

OTHER INCOME (EXPENSE):
     Gain on sale of investment in affiliate                  -            -           952           -
     Interest and dividend income                           126          402           380         956
     Interest expense                                    (2,786)      (1,605)       (4,664)     (3,222)
                                                   ------------- ------------   ----------- -----------

NET LOSS                                              $ (12,990)   $ (10,957)    $ (23,245)  $ (22,717)
                                                   ============= ============   =========== ===========

BASIC AND DILUTED NET LOSS PER SHARE                  $  (0.40)    $   (0.34)    $   (0.72)  $   (0.71)

WEIGHTED-AVERAGE NUMBER OF COMMON SHARES
     OUTSTANDING                                         32,376       32,154        32,324      32,094


The accompanying notes are an integral part of these condensed consolidated financial statements.

</TABLE>


                                       5

<PAGE>

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

<TABLE>
<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                  -           -          -           -           -           -        (23,245)     (23,245)
Increase in market
  value of investment     -           -          -           -           -          26              -           26
Realized investment
  holding gain            -           -          -           -           -        (952)             -         (952)
                                                                                                         ----------
Comprehensive loss                                                                                         (24,171)

Exercises of stock
  options                 -           -         58         169           -           -              -          169
Shares issued under
  401(k) plan             -           -         19         166           -           -              -          166
Conversion of 6.5%
  subordinated
  convertible notes
  into common stock       -           -        550       9,228           -           -              -        9,228
                    -------- ----------- ---------- ----------- ----------- ------------- ------------ ------------
Balance,
  June 30, 1999       2,000     $ 6,538     32,843     $90,387    $ 11,956    $      -    $  (182,463)   $ (73,582)
                    ======== =========== ========== =========== =========== ============= ============ ============
</TABLE>

The accompanying notes are an integral part of these condensed consolidated
financial statements.


                                                          6
<PAGE>

NORTH AMERICAN VACCINE, INC. AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF CASH FLOWS
(IN THOUSANDS)
(UNAUDITED)
<TABLE>
<CAPTION>
                                                                        SIX MONTHS ENDED
                                                                             JUNE 30,
                                                                      1999            1998
                                                                  -------------  ----------------
<S>                                                                  <C>               <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
    Net loss                                                         $ (23,245)        $ (22,717)
    Adjustments to reconcile net loss to net cash used in operating
    activities:
        Gain on sale of investment in affiliate                           (952)                -
        Depreciation and amortization                                    3,125             4,083
        Amortization and reduction of deferred financing costs             282               244
        Contribution of common stock to 401(k) plan                        166               139
        Debt conversion expense                                            940                 -
        Increase in other assets                                          (108)             (116)
        Increase (decrease) in deferred rent                                53               (32)
        Cash flows used in other working capital items                    (878)           (2,006)
                                                                  -------------  ----------------
         Net cash used in operating activities                         (20,617)          (20,405)
                                                                  -------------  ----------------

CASH FLOWS FROM INVESTING ACTIVITIES:
    Capital expenditures                                                (1,814)           (1,095)
    Proceeds from sale of investment in affiliate                        1,581                 -
                                                                  -------------  ----------------
         Net cash used in investing activities                            (233)           (1,095)
                                                                  -------------  ----------------

CASH FLOWS FROM FINANCING ACTIVITIES:
    Proceeds from exercises of stock options, net                          169             1,992
    Loan to a former officer related to the purchase of common stock         -            (1,228)
    Principal payments on capital lease obligations                       (977)             (777)
    Cash restricted for capital lease obligation                           825            (5,654)
                                                                  -------------  ----------------
         Net cash provided by (used in) financing activities                17            (5,667)
                                                                  -------------  ----------------

NET DECREASE IN CASH AND CASH EQUIVALENTS                              (20,833)          (27,167)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD                          22,953            45,502
                                                                  -------------  ----------------
CASH AND CASH EQUIVALENTS, END OF PERIOD                             $   2,120         $  18,335
                                                                  =============  ================

The accompanying notes are an integral part of these condensed consolidated financial statements.

</TABLE>


                                       7
<PAGE>

NORTH AMERICAN VACCINE, INC. AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF CASH FLOWS (CONTINUED)
(IN THOUSANDS)
(UNAUDITED)

<TABLE>
<CAPTION>
                                                                        SIX MONTHS ENDED
                                                                             JUNE 30,
                                                                     1999               1998
                                                                ----------------   ----------------

<S>                                                             <C>                <C>

CASH FLOWS PROVIDED BY OTHER WORKING CAPITAL ITEMS:

    (Increase) decrease in :
          Accounts receivable                                        $      481        $      (854)
          Inventory                                                        (663)              (188)
          Prepaid expenses and other current assets                         (36)              (225)

    Increase (decrease) in :
          Accounts payable                                                  222               (295)
          Deferred revenue and other current liabilities                   (882)              (444)
                                                                ----------------   -----------------
    Net cash used in other working capital items                     $     (878)       $    (2,006)
                                                                ================   =================



 SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:

 Cash paid for interest                                              $    3,476        $     2,984
                                                                ================   ================

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

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

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

</TABLE>


The accompanying notes are an integral part of these condensed consolidated
financial statements.


                                       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(TM))  in the
United States for the prevention of diphtheria, tetanus, and pertussis (whooping
cough).  Under a marketing agreement between the Company and Abbott Laboratories
("Abbott"),  Abbott markets  Certiva(TM) to private  physicians and managed care
markets in the United States for  immunization  of infants and children.  Abbott
began the launch of Certiva(TM) in October 1998. The Company markets Certiva(TM)
in the U.S.  to  government  purchasers,  including  state  governments  and the
Centers  for  Disease  Control  and  Prevention  ("CDC").  Previously,  in 1996,
regulatory  approval for a European  formulation of  Certiva(TM)  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.


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
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


                                       9

<PAGE>

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  $796,000 and $792,000 for
the first and second quarters of 1999, respectively, and $0 for each of the same
periods  in 1998.  Product  sales to  Europe  were  approximately  $363,000  and
$465,000 for the first and second quarters of 1999,  respectively,  and $263,000
and $81,000 for the same  periods in 1998.  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.

3. PROPERTY, PLANT AND EQUIPMENT


In March 1998, the Company leased an  approximately  75,500 square foot facility
to be used for research,  development,  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  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(TM)  for sale in the  United  States  were
capitalized,  except that costs  attributable  to Certiva(TM)  production  under
non-regulatory  approved  optimization  production  processes are being expensed
until  regulatory  approval is obtained for such new  processes.  Any production

                                       10

<PAGE>

costs incurred in excess of net realizable  value are expensed in the quarter in
which they are incurred.

Inventories consist of the following:

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

           Raw materials                 $ 2,110        $ 2,509
           Work in process                 1,947          1,024
           Finished goods                    673            534
                                         -------        -------
                Total                    $ 4,730        $ 4,067
                                         =======        =======


5. OTHER CURRENT LIABILITIES


Other current liabilities consisted of the following components:

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

Accrued interest                           $ 1,000          $ 1,103
Payroll and fringe benefits                  1,818            1,702
Accrued taxes                                  926            1,149
Reserve for contract loss                      720              720
Accrued consulting and professional fees       343              353
Accrued costs of clinical trials               221              216
Other accrued liabilities                      639              605
                                           -------          -------
   Total other current liabilities         $ 5,667          $ 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
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


                                       11
<PAGE>

credit and the  corresponding  restricted cash is $4.1 million at June 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 June 30, 1999.

8.    LINE OF CREDIT

In July 1999, the Company obtained a $6 million  revolving line of credit from a
bank maturing  December 31, 1999. The interest rate on borrowings under the line
of credit will be LIBOR plus 265 basis points.  BioChem Pharma Inc.  ("BioChem")
an affiliate of the Company, has provided a guarantee for a line of credit which
may  remain  in place  for up to two  years.  Upon  drawing  down on the line of
credit,  BioChem will be entitled to receive  warrants to purchase up to a total
of 750,000 shares of the Company's  Common Stock. The warrants will be issued by
the Company  ratably as it draws down under the line of credit such that BioChem
will  receive a warrant for 125,000  shares of Common  Stock for each $1 million
drawn down by the  Company.  Each warrant will have 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


                                       12
<PAGE>

June 28 and ended on July 2,  1999.  Each  warrant  will  contain  anti-dilution
provisions and  registration  rights among other  provisions.  In July 1999, the
Company drew down $2 million under the revolving line of credit and  accordingly
issued warrants to purchase 250,000 shares of Common Stock to BioChem.

The Company could recognize up to 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 will incur expense on a prorata basis if less than all
of the warrants are issued.























                                       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, PROSPECTS
FOR REDUCED  PRODUCTION COSTS,  LIKELIHOOD OF ADDITIONAL  FUNDING UNDER LICENSE,
MARKETING,   DISTRIBUTION   AND/OR   DEVELOPMENT   AGREEMENTS  OR  FROM  FURTHER
FINANCINGS,  PROSPECTS FOR COMPLETING NEW BUSINESS  COLLABORATION  ARRANGEMENTS,
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  NEW
BUSINESS  COLLABORATIONS;  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(TM)) in the United States for the prevention
of  diphtheria,  tetanus,  and  pertussis  (whooping  cough).  Under a marketing
agreement between the Company and Abbott Laboratories ("Abbott"), Abbott markets
Certiva(TM) to private  physicians and managed care markets in the United States
for immunization of infants and children. Abbott began the launch of Certiva(TM)
in October  1998.  The Company  markets  Certiva(TM)  in the U.S. to  government
purchasers,  including state governments and the Centers for Disease Control and
Prevention  ("CDC").  Previously,  in 1996,  regulatory  approval for a European
formulation of Certiva(TM) 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


                                       14
<PAGE>

authorizations  for the Company's  DTaP-IPV  vaccine  pending the  completion of
labeling issues related to distribution of the product.

         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.").  The Company anticipates that during the fourth quarter
of 1999 it will file with the U.K.  regulatory  authorities  the application for
approval of its group C meningococcal conjugate vaccine.

          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  approximately  $940,000 one-time  non-cash
expense  included in interest expense for the quarter ended June 30, 1999. As of
June 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.

           In July  1999,  the  Company  obtained  from a  commercial  bank a $6
million  revolving  line of credit  maturing  December  31,  1999.  BioChem  has
provided a  guarantee  for a line of credit  which may remain in place for up to


                                       15
<PAGE>

two years.  The  interest  rate on  borrowings  under the line of credit will be
LIBOR plus 265 basis  points.  Upon drawing down on the line of credit,  BioChem
will be entitled to receive warrants to purchase up to a total of 750,000 shares
of the  Company's  Common  Stock.  The  warrants  will be issued by the  Company
ratably as it draws down under the line of credit such that BioChem will receive
a warrant for 125,000  shares of Common Stock for each $1 million  drawn down by
the  Company.  Each  warrant  will  have 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  will  contain  anti-dilution  provisions  and
registrations rights among other provisions. In July 1999, the Company drew down
$2 million under the revolving line of credit and accordingly issued warrants to
purchase 250,000 shares of Common Stock to BioChem.  The Company could recognize
up to approximately  $1.6 million of interest expense upon the issuance of these
warrants to  purchase up to 750,000  shares of Common  Stock.  The Company  will
incur  this  expense  on a prorata  basis if less than all of the  warrants  are
issued.

         In August  1999,  the Company  entered into a contract for the sale and
leaseback  of its one  owned  facility.  The  sale  price  for the  facility  is
approximately  $2.1  million.  The lease for the facility will be for an initial
term of ten years with two five-year  renewal  options.  The initial base annual
rent under the lease is approximately  $240,000 with minimal annual escalations.
Closing  on  the   transaction   is  subject  to  customary  due  diligence  and
inspections.

         The  Company  had 303 and 296  employees  as of June 30, 1999 and 1998,
respectively.

RESULTS OF OPERATIONS

THREE MONTHS ENDED JUNE 30, 1999 AND 1998

         In 1999, the Company  recognized total revenue of $1.7 million of which
approximately  $792,000  was from product  sales of  Certiva(TM)  to  government
agencies and to Abbott,  approximately $465,000 was from sales of product to SSI
and  approximately  $423,000 was under  collaborative  agreements.  Revenue from
collaborative  agreements  consists of  development  funding under the Company's
agreement   with  Abbott.   Revenue  in  1998  totaled  $1.2  million  of  which
approximately  $81,000 was from sales of product to SSI and the  remaining  from
collaborative agreements.

         Production  expenses were $5.6 million in 1999 compared to $4.2 million
in 1998.  The increase in these expenses in 1999 is primarily  attributable  to:
higher  material and labor expenses,  contractor  expenses,  FDA  post-marketing
surveillance  expenses,   write-offs  of  finished  product  due  to  production
failures;  and aP production  under  optimized  production  processes  that were


                                       16
<PAGE>

expensed  during the period.  These  increases  were  partially  offset by lower
depreciation  related  to the  use of an  accelerated  depreciation  method  for
equipment  acquired prior to 1998,  lower repair and maintenance  expenses,  and
increased  inventory levels.  Costs attributable to Certiva(TM)  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 $3.9 million in 1999 compared to
$4.5  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(TM),  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 clinical trial costs offset in part by higher labor cost attributed to
additional employees for product development projects.

         General and administrative  expenses were $2.6 million in 1999 compared
to $2.3 million in 1998.  In 1999,  there was an increase in labor costs as well
as increased  building costs associated with the new facility occupied beginning
in the third  quarter of 1998,  while the Company  incurred  rent expense on its
former headquarters  through July 1999. These increases were partially offset by
a  decrease  in  outside  marketing  related  costs,  which  was the  result  of
management's plan to reduce costs in the second quarter of 1999.

         Interest  and  dividend  income  decreased  to  $126,000  in 1999  from
$402,000 in 1998.  This  reduction is due primarily to a decrease in the average
cash balance.

         Interest expense increased to $2.8 million in 1999 from $1.6 million in
1998.  The  increase  is due  primarily  to the  approximate  one-time  non-cash
$940,000 expense  recognized on the conversion of $8.4 million  principal amount
of 6.5% Notes and  increased  debt  related to the 4.5% Notes  offset in part by
principal payments made on the equipment lease.

         The  factors  cited above  resulted  in a net loss of $13.0  million or
$0.40 per share in 1999 as compared to a net loss of $11.0  million or $0.34 per
share in 1998. The weighted-average number of common shares outstanding was 32.4
million for 1999 compared to 32.2 million for 1998. Without the $940,000 expense
recognized  on the  conversion  of the 6.5%  Notes the net loss  would have been
$12.1 million or $0.37 per share. The increase in the number of weighted-average
shares outstanding for 1999 as compared to 1998 is attributable primarily to the
exercise of stock options subsequent to June 30, 1998, and the conversion of the
6.5% Notes into 550,000 shares of Common Stock in June 1999.

SIX MONTHS ENDED JUNE 30, 1999 AND 1998

         In 1999, the Company  recognized total revenue of $3.2 million of which
approximately  $1.6 million was from product sales of  Certiva(TM) to government
agencies and to Abbott,  approximately $828,000 was from sales of product to SSI
and  approximately  $788,000 was under  collaborative  agreements.  Revenue from
collaborative  agreements  consists of  development  funding under the Company's
agreement   with  Abbott.   Revenue  in  1998  totaled  $2.1  million  of  which
approximately  $344,000 was from sales of product to SSI and the remaining  from
collaborative agreements.



                                       17
<PAGE>

         Production expenses were $10.4 million in 1999 compared to $9.2 million
in 1998.  The increase in these expenses in 1999 is primarily  attributable  to:
higher  material and labor expenses,  contractor  expenses,  FDA  post-marketing
licensing  and  surveillance  expenses,  write-offs  of finished  product due to
production failures; and aP production under optimized production processes that
were expensed during the period.  These increases were partially offset by lower
depreciation  related  to the  use of an  accelerated  depreciation  method  for
equipment  purchased  prior  to  1998,  repair  and  maintenance  expenses,  and
increased  inventory levels.  Costs attributable to Certiva(TM)  production were
expensed  until  regulatory  approval was obtained in the third quarter of 1998;
however, costs attributable to Certiva(TM) production under optimized production
processes are being expensed until regulatory  approval is obtained for such new
processes.

         Research and development expenses were $7.6 million in 1999 compared to
$8.5  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(TM),  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,  lower clinical trial costs offset in part by higher labor cost
attributed to  additional  employees  for product  development  projects and the
reimbursement of expenses under a collaborative agreement in 1998.

         General and administrative  expenses were $5.1 million in 1999 compared
to $4.8  million  in 1998.  In 1999  there was an  increase  in  building  costs
associated  with the new facility  occupied  beginning  in the third  quarter of
1998, while the Company incurred rent expense on its former headquarters through
July 1999,  and an increase  in labor costs and  supplies  and  services.  These
increases  were  partially  offset by a decrease  in outside  marketing  related
costs,  which was the result of management's  plan to reduce costs in the second
quarter of 1999.

         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  $380,000  in 1999  from
$956,000 in 1998.  This  reduction is due primarily to a decrease in the average
cash balance.

         Interest expense increased to $4.7 million in 1999 from $3.2 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,  and increased debt
related  to the 4.5%  Notes  offset in part by  principal  payments  made on the
equipment lease.

         The  factors  cited above  resulted  in a net loss of $23.2  million or
$0.72 per share in 1999 as compared  to a net loss of $22.7  million or $.71 per
share in 1998. The weighted-average number of common shares outstanding was 32.3
million for 1999 compared to 32.1 million for 1998.  Without the gain on sale of
the  investment in an affiliate and the expense  recognized on the conversion of
the 6.5% Notes,  the net loss would have been $23.2  million or $0.72 per share.


                                       18
<PAGE>

The increase in the number of  weighted-average  shares  outstanding for 1999 as
compared to 1998 is  attributable  primarily  to the  exercise of stock  options
after June 30, 1998, and the conversion of the 6.5% Notes into 550,000 shares of
the Company's Common Stock in June 1999.

LIQUIDITY AND CAPITAL RESOURCES; OUTLOOK

         The Company's  cash  requirement  for operations for the second quarter
was $10.7 million as compared to $9.9 million in the first quarter of 1999.  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 June  30,  1999,  the  Company  had cash  and  cash  equivalents  of
approximately  $2.1 million.  In addition,  the Company had  approximately  $4.1
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.  In March 1999,
the Company sold all 125,000  shares of its  investment in IVAX resulting in net
proceeds of approximately $1.6 million.

         PROJECTED RESULTS FROM OPERATIONS. The Company anticipates that it will
report a net loss of between $10 and $11 million for the third  quarter of 1999.
It will likely incur a quarterly  net  operating  loss in the fourth  quarter of
1999,  based upon  several  factors.  The  factors  included  in  assessing  the
projected  losses  are,  among  others:  limited  projected  revenues;   current
manufacturing  limitations;  the  costs  required  to  accelerate  the  group  C
meningococcal  conjugate  vaccine  program;  the timing and amount of  milestone
payments  under  existing  collaboration  agreements;  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
Certiva(TM)  sales, which began during the middle of the fourth quarter of 1998.
Revenues from the sale of Certiva(TM) and aP sales to SSI have been limited. The
reported net sales during the second  quarter of 1999, the first quarter of 1999
and the fourth quarter of 1998 were  approximately  $792,000,  $796,000 and $1.2
million,  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  issues are  resolved,  the Company will be
unable to sell any aP vaccine through Chiron Behring GmbH and Co., its appointed
distributor.  There can be no assurance  that this issue will be  satisfactorily
resolved,  or that if resolved,  any product  launch will  generate  significant
revenues in 1999. The Company  anticipates limited revenues from Certiva(TM) and
aP  during  the  remainder  of 1999 and into  2000  due to  production  capacity
limitations  for  Certiva(TM)  and aP, as  described  below,  and as the Company
changes  over  from  Certiva(TM)  and aP  production  to  produce  the  group  C


                                       19
<PAGE>

meningococcal  conjugate  vaccine  beginning  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 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 Certiva(TM) and its
acellular  pertussis toxoid. In addition,  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 order to  address  these  production  limitations,  the  Company  is
implementing a two-step enhancement program. First, the Company is modifying its
existing facilities and operations in a manner intended to significantly  expand
production  capacity and efficiency.  These  enhancements began during the first
quarter  and are on track to be  completed  in time for the  Company to file the
appropriate  documentation  with the FDA by the end of the third 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  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
during the  remainder of 1999 and into early 2000.  Upon  completion  of both of
these programs,  the Company expects that unit production  costs will be reduced
significantly and that Certiva(TM) could be produced in sufficient quantities to
generate a gross profit based on current  known  pricing  arrangements,  current
competitive environment, and projected mix of customer purchases.

         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 U.S.
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(TM).  The Company  intends to submit
data to the FDA on the  European  formulation  of  Certiva(TM),  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(TM), as well as the impact to the current selling price.
The Company expects to submit data to the FDA on a thimerosal-free formulation


                                       20
<PAGE>

of  Certiva(TM)  before the end of the fourth  quarter of 1999,  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(TM)  that  it has in
inventory  and  has  begun  to   manufacture   thimerosal-free   Certiva(TM)  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(TM),  and the market  opportunities for a launch of the
group C meningococcal conjugate vaccine in 2000, the Company, beginning in early
fourth quarter 1999,  will produce its group C meningococcal  conjugate  vaccine
for sale in the U.K. in the facility  that is currently  producing  Certiva(TM).
All  costs  associated  with  this  production  effort  will be  expensed  until
regulatory approval is obtained. Because of the planned production of Meningitis
C vaccine in this facility,  neither acellular pertussis vaccine nor Certiva(TM)
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 2000.

         Under the guarantee  agreement  with BioChem for the $6 million line of
credit  obtained in July 1999,  the Company will issue warrants to BioChem as it
draws down on the line of credit.  In July,  the Company drew $2 million down on
this line of credit and issued a warrant to BioChem  for  250,000  shares of the
Company's Common Stock. The Company will recognize up to approximately  $550,000
of interest expense associated with the issuance of these warrants.  The Company
will incur additional  expense on a prorata basis should the remaining  warrants
be issued.

         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,  the  Company  will be
continuing its development efforts for several products, including those covered
by existing marketing,  license and research agreements. The Company is entitled
under those  agreements  to milestone  payments upon  achievement  of prescribed
events. In addition,  the Company is entitled to be paid for certain  prescribed
development  costs as  incurred.  The  milestone  payments  under  the  existing
agreements  are tied to  measured  progress  in the  regulatory  process for the
Company's  combination  and group B  meningococcal  vaccines.  Although  initial
clinical development plans have been completed for these products,  and clinical
trials are projected to commence during 1999,  there are no assurances that such
milestone  events will occur during 1999,  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) and  likelihood of
further  regulatory  approvals;  the  ability  of  the  Company  to  timely  and
efficiently  expand its production  capacity and lower unit costs; the timing of
group C meningococcal  conjugate vaccine production and regulatory filings;  and
the ability of the Company to address  production  failures,  among others.  The


                                       21
<PAGE>

factors that affect the level of future  revenues  from product  sales  include,
among other things, 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 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 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 timing for  commercialization  of the group C meningococcal  conjugate
vaccine include, among other things,  successful changeover in the manufacturing
facility  and results of ongoing  clinical  trials.  In  addition,  there are no
assurances that the steps taken by the Company to address production disruptions
and  failures  and quality  testing  inefficiencies  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 third  quarter of 1999 are projected to be between $9 and $11
million,  and between $40 and $44 million for 1999. 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 third quarter cash requirement is anticipated to be slightly lower than that
incurred in the second quarter of 1999 due primarily to the semi-annual interest
payment of $2.7 million on the 6.5% Notes and the approximately $600,000 payment
for the 4.5% Notes both paid in May 1999.  The  foregoing  is a forward  looking
statement 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 half of
1999 were $2.1 million which includes a $260,000 capital lease for equipment. As
noted above, the Company is expanding its manufacturing  capacity and efficiency
for its acellular  pertussis  toxoid and  Certiva(TM) and is planning to produce
the group C  meningococcal  conjugate  vaccine  beginning in the third or fourth
quarter of 1999. Total projected capital  expenditures for the remainder of 1999
for facilities'  modifications,  equipment,  systems and other capital additions
could range  between $2 million to $4 million.  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


                                       22
<PAGE>

equipment  purchases  required  in order to  produce  the group C  meningococcal
conjugate vaccine;  and the amount and timing of unanticipated  costs to replace
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(TM)  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  intends  to:  enter  into  new  license,  marketing,
distribution  and/or  development  agreements  that are  currently  under active
discussion;  complete a sale and lease-back of the Company's one owned facility;
and  obtain  one or more  lines of  credit,  which may be  secured  by  accounts
receivable, inventory or other assets of the Company. The Company has reached an
agreement  with BioChem  under which  BioChem will  guarantee up to a $6 million
line of credit with a commercial bank. The guarantee will remain in place for up
to two years. The current line of credit expires December 31, 1999. The proceeds
from the line of credit,  which the Company has begun to draw upon, will be used
to fund the  Company's  near  term cash  requirements  as it  completes  pending
negotiations on one or more strategic initiatives.  The Company believes that it
will meet 1999 cash requirements for operations through these efforts,  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 amount and timing of product
sales,  the amount and timing of payments under  existing and new  collaborative
agreements  and the  amount  and timing of any  proceeds  from other  previously
identified funding sources.

         In  addition,  the  Company  continues  its  ongoing  discussions  with
numerous  third  parties   regarding   various  business   arrangements.   These
discussions  involve  potential  transactions  ranging  from  single or multiple
product distribution,  license or other collaboration agreements for one or more
products to expedite commercialization timelines, which may include up-front and
milestone payments,  through a potential sale of part or all of the Company. The
Company has retained the services of an investment  banking firm to assist it in
connection with certain of its strategic discussions.  Given the status of these
negotiations, the Company believes it will be able to expeditiously complete one
or more of these  arrangements.  There are no  assurances  that the Company will
successfully  negotiate and sign any such  agreements or that, if executed,  the
financial terms for any such agreement will be significant.

         If the  Company is unable to  complete  the  transactions  noted  above
and/or  proceeds  from the  transactions  are  inadequate,  the Company would be
required to obtain  additional  funding  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 or in amounts  required to
meet future cash  requirements,  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.



                                       23
<PAGE>

         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.

TAX AND OTHER MATTERS

         At December 31, 1998, the Company and its  subsidiaries  had income tax
loss carry  forwards of  approximately  $30.0 million to offset future  Canadian
source  income and  approximately  $94.7  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.   Product  sales  in  the  United  States  were
approximately  $792,000  and $0 for the  quarters  ended June 30, 1999 and 1998,
respectively.  Product sales to Europe were  approximately  $465,000 and $81,000
for the quarters  ended June 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.


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 a recent internal
interim  assessment,   the  Company  believes  that  the  principal   management
information  system software that is currently being used is designed to be Year


                                       24
<PAGE>

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 substantially completed the inventory of
its information technology and date-sensitive  systems. The Company is currently
completing the assessment  phases and has commenced the required  remediation of
noncompliant  systems to  achieve  Year 2000  qualification.  This is an ongoing
process  and the  Company is unable at this time to assess the  impact,  if any,
this program 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 in the  process of  developing  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 preliminary
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 June 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 June 30, 1999,  is low, as the  investments  mature within three
months.



                                       25
<PAGE>

         The Company had $25 million of 4.5% Notes at June 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 June 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  drew down $2 million  under a revolving  line of credit in
July 1999. The loan bears interest at LIBOR plus 265 basis points which was 7.9%
per annum  through  September  17,  1999 at which time a new  interest  rate and
period will be determined.  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 $2  million  loan 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;  however,  such
obligations are not material to the Company's operations.














                                       26
<PAGE>


                           PART II. OTHER INFORMATION

ITEM 1.  LEGAL PROCEEDINGS

On June 23, 1999, the U.S. District Court,  District of Maryland,  dismissed all
claims  filed by Sharon  Mates,  the  Company's  former  president,  against the
Company,   the  two  named  directors  and  affiliate,   BioChem  Pharma,   Inc.
("BioChem").  In July 1999,  Dr.  Mates filed a notice of appeal of the District
Court's decision to the United States Court of Appeals for the Fourth Circuit.

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  responded by filing a motion to dismiss  seeking a
court  order  dismissing  all  claims on the basis that the  allegations  in the
complaint are not recognizable under applicable law.

ITEM 2.  CHANGES IN SECURITIES AND USE OF PROCEEDS

On June 17, 1999,  the Company  retired $8.4 million of the principle  amount of
the 6.5%  convertible  subordinated  notes in exchange for 550,000 shares of the
Company's  Common Stock,  in reliance on Section  3(a)(9) of the Securities Act.
See Part I, Item 2 Management's  Discussion and Analysis of Financial  Condition
and Results of Operations.

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 will
be LIBOR plus 265 basis  points.  BioChem,  an  affiliate  of the  Company,  has
provided a guarantee, which will remain in place for up to two years, for a line
of credit from a bank. Upon drawing down on the line of credit,  BioChem will be
entitled to receive  warrants to purchase up to a total of 750,000 shares of the
Company's  Common Stock in reliance on Section 4 (2) of the Securities  Act. The
warrants  will be issued by the Company  ratably as it draws down under the line
of credit such that BioChem will receive a warrant for 125,000  shares of Common
Stock for each $1 million  drawn down by the  company.  Each warrant will have 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  will  contain
anti-dilution  provisions and registrations  rights among other  provisions.  In
July 1999 the Company drew down $2 million  under the  revolving  line of credit
and accordingly  issued  warrants to purchase  250,000 shares of Common Stock to
BioChem.












                                       27
<PAGE>


ITEM 6.  EXHIBITS AND REPORTS ON FORM 8-K

         (a)   Exhibits

               Exhibit No. Description

                    10.42  Common Stock  Purchase  Warrant  dated July 21,
                           1999 issued to BioChem.

                    10.43  Letter  Agreement  dated July  1, 1999  between
                           the Company and BioChem.

                    10.44  Line of Credit Agreement dated July 12, 1999.

                    27     Financial Data Schedule



         (b)   Reports on Form 8-K


               On June 17,  1999,  the  Company  filed with the  Securities  and
               Exchange  Commission  a Current  Report on Form 8-K under  Item 5
               reporting that the Company retired  approximately $8.4 million of
               its  6.5%  convertible  subordinated  notes in  exchange  for the
               issuance of 550,000 shares of the Company's  Common Stock, no par
               value.






















                                       28
<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: August 11, 1999






                                       29





            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-1                                                          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 July 21, 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 July 21, 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


                                       1
<PAGE>

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
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.


                                       2
<PAGE>

          (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 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


                                       3
<PAGE>

Warrant Shares to the transferee is exempt from the registration requirements of
the  Securities  Act;  and (z) such  other  documentation,  representations  and
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 Chief Executive Officer and President and its corporate seal
to be hereunto affixed and attested by its Secretary this 21st day of July 1999.

ATTEST:                                  NORTH AMERICAN VACCINE, INC.



/s/ Russell P. Wilson                    By: /s/ Randal Chase
- ----------------------------                 --------------------------
Russell P. Wilson                            Randal Chase
  Assistant Secretary                        Chief Executive Officer & President


[Corporate Seal]




                          NORTH AMERICAN VACCINE, INC.

                                                                    July 1, 1999
BioChem Pharma Inc.
275 Armand Frappier Blvd
Laval, Quebec H7V 4A7
Canada

Re:   GUARANTY OF $6 MILLION (US) LINE OF CREDIT

Gentlemen:

      As you know, North American  Vaccine,  Inc. ["NVX"] is presently seeking a
line of credit [the "Line of Credit"] from Royal Bank of Canada in the principal
amount of Six Million Dollars (US) [$6,000,000  (US)] [the "Principal  Amount"].
The bank has  indicated  its  intention  to  provide  the Line of  Credit in the
Principal  Amount  to NVX in  accordance  with  the  term  sheet a copy of which
attached hereto provided that it receives an unsecured guaranty [the "Guaranty"]
from BioChem Pharma Inc.  ["BioChem"] in favor of, and in a form  acceptable to,
the bank supporting all amounts drawn down under the Line of Credit.

      This letter is to confirm  the  agreement  between  NVX and BioChem  under
which BioChem will provide the Guaranty of up to the Principal Amount to support
the Line of Credit  proposed to be  extended to NVX by Royal Bank of Canada,  or
any other mutually acceptable lending institution ["Lender"].

1.    PROVISION OF GUARANTY

      a. Subject to approval by its board of directors,  which shall be obtained
on or before July 9, 1999,  BioChem  hereby  agrees to provide  the  Guaranty in
favor of, and in a form  acceptable  to, the Lender up to the Principal  Amount.
The Guaranty shall be furnished to the Lender in  consideration  of the Lender's
commitment  to extend a Line of Credit to NVX in the Principal  Amount.  BioChem
shall execute and deliver such  documents  and  agreements as may be required by
the Lender to  implement  the  Guaranty  in favor of the Lender  within five (5)
business  days of  receiving  the  request of the Lender.  BioChem  shall not be
required  to provide  the  Guaranty  if the Lender  does not provide the Line of
Credit to NVX.

      b. BioChem agrees that the Guaranty shall remain in effect for a period of
not less than twenty-four (24) continuous months ["Guaranty  Period"] to support
the Line of Credit and/or any successor line of credit or other credit  facility
obtained by or for NVX; provided,  however, at no time shall the Guaranty exceed
the Principal  Amount and provided  further that no successor  line of credit or
other credit facility contain terms and condition that are less favorable to NVX
than those  contained in the Line of Credit  collateralized  by the Guaranty and
provided  further that no successor line of credit or other credit facility that
will be  collateralized  by the  Guaranty  shall be entered  into by NVX without
BioChem's  express  written  consent  that  will not be  unreasonably  withheld,
conditioned or delayed.

      c. BioChem  agrees  to provide  NVX with all  reasonable  cooperation  and
assistance  in  obtaining a successor  or  replacement  line of credit,  loan or
credit  facility for NVX if the Line of Credit  expires  unrenewed or unextended
before the  expiration  of the Guaranty  Period,  including  without  limitation
executive and delivery of all documents requested by Lender;  provided,  however
that such cooperation shall not be more onerous to BioChem than that required of
it in the initial  issuance of the Guaranty and provided further that the amount
of the successor or replacement  line of credit that will be  collateralized  by
the Guaranty shall not exceed the Principal Amount.

      d. As a condition  to  BioChem's  obligation  to issue the  Guaranty,  NVX
agrees to give BioChem at least two (2) business days notice of its intention to
draw any borrowings under the Line of Credit. In addition, NVX understands,  and
the relevant  documents  and  agreements  shall  reflect to the greatest  extent
possible, that BioChem's guarantee obligation under the Guaranty shall be one of
collection and that the Lender shall be required to exercise all commercially

<TABLE>
<CAPTION>
<S>                      <C>                    <C>                    <C>

10150 Old Columbia Road  o  Columbia, MD 21046  o  Phone 410-309-7100  o  Fax 410-309-4077

</TABLE>


<PAGE>

BioChem Pharma Inc
July 1, 1999
Page 2 of 8

reasonable  remedies,  short of litigation to final  judgment,  to satisfy NVX's
obligations  under the Line of Credit  prior to  requiring  payments  by BioChem
pursuant to the Guaranty.

2. ISSUANCE OF WARRANT   In consideration  of  BioChem providing the Guaranty to
the Lender as contemplated by Article 1 above, NVX agrees that it shall issue to
BioChem one or more Stock Purchase Warrant(s)  (individually  referred to herein
as the "Warrant" and collectively  referred to herein as the "Warrants") in form
and content  substantially  the same as that  attached  hereto and  incorporated
herein by this reference on the following terms and conditions:

      a.  The exercise price of the Warrants shall be the average of the closing
prices of the common stock of NVX on the American  Stock  Exchange over a period
of five trading days commencing on June 28, 1999 and ending July 2, 1999.

      b.  If the Line of Credit is drawn down by NVX for the full  amount of the
Principal  Amount,  BioChem  shall  be  entitled  to one or more  Warrant(s)  to
purchase a total of Seven  Hundred  Fifty  Thousand  (750,000)  shares of common
stock of NVX.  Accordingly,  a Warrant shall be issued ratably as NVX draws down
on the Line of Credit as follows:  for each One Million Dollars (US) [$1,000,000
(US)] (or fraction thereof) of principal amount drawn down by NVX under the Line
of Credit,  NVX shall issue to BioChem a Warrant to acquire  One Hundred  Twenty
Five Thousand (125,000) shares of common stock of NVX.

      c.  Each  Warrant  shall  have a term of two (2)  years  from  the date of
issuance and shall be non-negotiable and non-transferable except under the terms
and conditions set forth therein.

      d.  The shares of  common  stock of NVX  issuable  upon  exercise  of each
Warrant [the "Warrant Shares"] shall be fully reserved for issuance at all times
during which the Warrant is issued and outstanding  and, at the time of delivery
if such  Warrant is duly and  properly  exercised,  shall be validly  issued and
outstanding, fully paid and non-assessable.

3. TRANSFER  RESTRICTIONS AND REPRESENTATIONS   In  connection with the issuance
of the Warrants and the Warrant Shares [collectively the "Securities"],  BioChem
hereby  acknowledges  that the  Securities  will be issued to it  pursuant to an
exemption  from the  registration  provisions of the  Securities Act of 1933, as
amended,  and other  applicable  securities laws  [collectively  the "Securities
Acts"]. BioChem specifically acknowledges and agrees that:

      a.  the purchase of the Securities  involves a high degree of risk in that
an investment in the Company is highly speculative and BioChem may suffer a loss
of its entire investment;

      b.  the transferability  of the  Securities  will be  limited as set forth
below  and  thus  it may  not be able to  liquidate  all or any  portion  of the
investment;

      c.  it is  able,  either  alone  or with an  investor  representative,  to
evaluate  the merits and risks of this  investment  and that it  recognizes  the
highly speculative nature of this investment;

      d.  it has  had  access  to all  information  regarding  NVX  that  it has
requested  or desired to know,  that all  documents  which  could be  reasonably
provided have been made  available for its inspection and review and that it has
been afforded the  opportunity to ask question of and receive  answers from duly
authorized  officers  or  other  representatives  of  the  NVX  concerning  this
transaction and any additional information that it has requested;

      e.  the Securities  are being acquired for its own account, for investment
purposes only and not with a view to  distribution  or resale to others and that
the exemption  from the  registration  requirements  of the Securities Act being
claimed  by NVX for  this  transaction  is  dependent,  in  part,  on  BioChem's
investment intent;

      f.  it understands  there is no public market for the Warrants and none is
likely to develop;


<PAGE>

BioChem Pharma Inc
July 1, 1999
Page 3 of 8

      g.  it is an  "accredited  investor" within the  meaning of Section  2(15)
and/or Rule 501 under the Securities Act;

      h.  it understands  that the Securities are being offered in a transaction
not involving any public  offering  within the meaning of the  Securities  Acts,
that the Securities will not be registered under the Securities Acts and that it
may not resell,  pledge or  otherwise  transfer  any such  Securities  except in
accordance  with the terms and  restrictions  contained in the Warrants and in a
transaction exempt from the registration requirements of the Securities Acts.

      i.  it consents to the placement of a legend  on  the  Securities  stating
that they have not been  registered  under the Securities Acts and setting forth
or referring to the restrictions on transferability and sale thereof.

4.    OTHER REPRESENTATIONS AND WARRANTIES

      a.    BioChem represents and warrants as follows:

            i   BioChem is a corporation  duly organized and existing  under the
laws of Canada and has the  corporate  power to  conduct  the  business  that it
conducts and proposes to conduct;

            ii  Upon  pproval of this  agreement  by the Board of  Directors  of
BioChem,  the execution,  delivery and  performance of this agreement by BioChem
will be duly approved by all necessary corporate action, and all other corporate
authorities,  approvals and actions  required to authorize  BioChem to issue the
Guaranty and to receive the  Warrants and purchase the Warrant  Shares will have
been duly taken and approved;

            iii The  consummation  of  the  transactions  contemplated  by  this
agreement   will  not  violate  or   constitute   a  default   under   BioChem's
organizational  documents or any material agreements to which BioChem is a party
or by which its  properties  are bound or constitute a violation of any material
order,  rule,  regulation,  writ,  injunction,  or  decree  of  any  government,
governmental instrumentality or court, domestic or foreign;

            iv  It has not  retained a  placement  or selling  agent,  broker or
dealer to represent it in the  acquisition of the Warrants or the Warrant Shares
and no person has any claim or right to any commission or other  remuneration as
a result of contract or agreement with BioChem in connection  with the execution
or consummation of the transactions contemplated by this agreement.

      b.    NVX represents and warrants as follows:

            i   NVX  is  a corporation duly organized and existing under the law
of Canada  and has the corporate  power to conduct the business that it conducts
and proposes to conduct;

            ii  The  execution, delivery  and  performance of  this agreement by
NVX has been  duly  approved  by the  Board of  Directors  of NVX and all  other
corporate  actions required to authorize and effect the issuance of the Warrants
and sale of the Warrant Shares have been duly taken and approved;

            iii The  Warrant Shares have been duly and  validly  authorized  and
when  issued and paid for in  accordance  with the terms and  conditions  of the
Warrants will be validly issued, fully paid and non-assessable  shares of common
stock of NVX;

            iv  NVX  is   not  in  violation  or  default under,  nor  will  the
execution  and delivery of this  agreement,  the issuance of the Warrants or the
Warrant  Shares and the  incurrence  of the  obligations  herein and therein set
forth and the consummation of the transaction  contemplated  hereby and thereby,
result in a violation of, or constitute a default  under,  NVX's  certificate of
incorporation or by-laws;


<PAGE>

BioChem Pharma Inc
July 1, 1999
Page 4 of 8

            v.  The  consummation  of  the  transactions  contemplated  by  this
agreement will not violate or constitute a default under any material agreements
to which NVX is a party or by which its  properties  are bound or  constitute  a
violation of any material order, rule, regulation,  writ, injunction,  or decree
of any government, governmental instrumentality or court, domestic or foreign.

            vi. no consent,  approval or filing with any governmental  authority
or other  party is  required  by NVX for the  consummation  of the  transactions
contemplated by this agreement  including in connection with the issuance of the
Warrants and the Warrant Shares other than the required and  applicable  notices
and filings to be made with the U.S. Securities & Exchange Commission,  notices,
filings and approvals  requited by state and  provincial  securities  regulatory
authorities,  and  notices  and  listing  agreements  with  the  American  Stock
Exchange.

5.   REGISTRATION  RIGHTS NVX and BioChem agree that the Warrant Shares shall be
included in the definition of  "Registrable  Securities" as that term is defined
in Schedule 4 to the Share Purchase  Agreement between the parties dated January
17, 1990, as amended, ("Share Purchase Agreement") and that as such, the Warrant
Shares shall be subject to all terms and  conditions  of BioChem's  registration
rights  as  specified  in  Section  One  of  Schedule  4 to the  Share  Purchase
Agreement.  As a consequence of this Section 5, the  definition of  "Registrable
Securities"  as set forth in  Schedule  4,  Section  1.1 to the  Share  Purchase
Agreement is hereby  modified to add new  Subsections  (iii) and (iv) at the end
thereof to read in its entirety as follows:

     "Registrable  Securities"  shall mean (i) the Common Shares,  (ii) any NAVA
     common  shares  issued  pursuant  to the  Options or issued or  issuable in
     respect  of the  Common  Shares,  upon any  stock  split,  stock  dividend,
     recapitalization,  or similar  event,  so long as the Common Shares and any
     NAVA  common  shares  issued in respect  of the Common  Shares are owned by
     BioChem,  (iii) any NAVA common shares  issued  pursuant to the exercise of
     one or more Warrant(s)  ("Warrant  Shares"),  which Warrant or Warrants are
     granted to BioChem  pursuant to the terms of that certain letter  agreement
     dated July 1, 1999 between NAVA and BioChem and (iv) any NAVA common shares
     issued or issuable in respect of the Warrant Shares,  upon any stock split,
     stock dividend, recapitalization,  or similar event, so long as the Warrant
     Shares and any NAVA common shares  issued in respect of the Warrant  Shares
     are owned by BioChem.

 6.   OTHER MATTERS

      a.  No modification, amendment, deletion, addition or other change in this
agreement  or any  provision  hereof,  or waiver  of any right or remedy  herein
provided,  shall be effective for any purpose unless specifically set forth in a
writing  signed  by the  Party to be bound  thereby.  No  waiver of any right in
respect of an  occurrence  or event on one occasion  shall be deemed a waiver of
such  right or  remedy  in  respect  of such  occurrence  or event on any  other
occasion.

      b.  Any  notice  required  to  be  given  hereunder  shall  be  in English
language,  in writing  and shall be deemed to have been duly given and  received
upon  transmission when telecopied with verification of receipt or upon delivery
if sent by Federal Express, DHL or other internationally recognized overnight or
express courier. Addresses for the delivery of notices shall be as follows:

      For BioChem:  BioChem Pharma Inc., 275 Armand Frappier  Boulevard,  Laval,
Quebec  H7V  4A7,   Canada;   Attn:   Chief   Financial   Officer  ;   Telecopy:
1-450-978-7755.

      For NVX: North American Vaccine,  Inc.; 10150 Old Columbia Road; Columbia,
MD 21046 USA; Attn: Vice President Finance; Telecopy: (410) 309-4077

      c.  Notwithstanding  the place where this agreement may be executed by any
of the  parties  hereto,  the  parties  expressly  agree  that all the terms and
provision  hereof shall be construed in accordance with and governed by the laws


<PAGE>

BioChem Pharma Inc
July 1, 1999
Page 5 of 8

of the State of New York  (regardless of the laws that might be applicable under
principles of conflicts of law),  including without limitation as to all matters
of validity, construction, effect and performance.

      d.  This agreement  may be executed in one or more  counterparts,  each of
which  shall  be  deemed  to be an  original  but all of  which  together  shall
constitute one and the same instrument.

      e.  This agreement  shall be  binding  on and inure to the  benefit of the
parties hereto and to their respective  successors and permitted  assigns.  This
agreement may not be assigned by operation of law, by "change of control" of NVX
or otherwise,  without the express written  consent of BioChem.  For purposes of
this  agreement,  the term  "change  of  control"  shall  include  either of the
following  events:  (i) any "Person"  and/or  "Group" (as such terms are used in
Section 13(d) of the Securities Exchange Act of 1934, as amended, (the "Exchange
Act")] other than BioChem or its  affiliates,  becomes the beneficial  owner (as
defined in Rules 13d-3 and 13d-5 under the Exchange  Act] directly or indirectly
of more than thirty percent (30%) of NVX's total outstanding  voting securities,
provided however the acquisition of beneficial ownership by such Person or Group
of more than thirty percent (30%) of NVX's total outstanding  voting securities,
which  acquisition was  accomplished in whole or in part by virtue of a purchase
or a series of related  purchases of securities,  rights,  or  instruments  from
BioChem and/or its affiliates,  shall not be considered a change of control;  or
(b) NVX consolidates or merges with or into any Person,  or conveys,  transfers,
leases or otherwise  disposes of all or  substantially  all of its assets to any
Person,  or any Person  consolidates  with or merges into NVX, in any such event
pursuant to a transaction in which the outstanding  voting  securities of NVX is
converted  into or exchanged for cash,  securities or other  properties.  In the
event of a "change of  control" of NVX,  BioChem  shall have the right to cancel
this  agreement and the Guaranty.  The  cancellation  of this  agreement and the
Guaranty  in  connection  with a change of control of NVX shall in no way modify
the terms and conditions of the Warrant(s) that might have been issued by NVX to
BioChem hereunder.

      f.  This agreement sets forth the entire understanding of the  parties  as
to the  subject  matter hereof and merges and  supercedes all prior discussions,
agreements and understandings of any and very nature among them.

      g.  Each  party  agrees to take or cause to be taken such further actions,
to execute,  deliver and file or cause to be executed,  delivered and filed such
further  documents  and  instruments,  and to  obtain  such  consents  as may be
necessary or as may be  reasonably  requested in order fully to  effectuate  the
purposes, terms and conditions of this agreement.

      h.  This agreement is written and executed in the English  language. It is
understood  that,  for  purposes of  obtaining  the  regulatory  approval of the
agreement  by  appropriate  governmental  authorities,  that  the  text  of this


<PAGE>

BioChem Pharma Inc
July 1, 1999
Page 6 of 8

agreement, if necessary, may be translated into appropriate language(s).  In the
event of a difference in the meaning between the translated text and the English
text, the English text shall govern.  Il est de la volonte  expresse des parties
que cette  convention et touts les documents s'y  rattachant  soient  rediges et
signes en anglais.

      *                 *                 *                       *

      Please  acknowledge  your  acceptance and agreement with the terms of this
agreement by signing and returning the enclosed copy of this letter.

                                          Sincerely,

                                          North American Vaccine, Inc.


                                          By:   /s/ Daniel J. Abdun-Nabi
                                                --------------------------
                                          Name: Daniel J. Abdun-Nabi
                                          Title:Senior Vice President
                                          Legal Affairs & General Counsel



ACCEPTED AND AGREED
this 1st day of July, 1999

BioChem Pharma Inc

By:    /s/ Francois Legault
       -----------------------------------
Name:  Francois Legault
Title: Executive V.P. Corporate Development


By:    /s/ Charles A. Tessier
       -----------------------------------
Name:  Charles A. Tessier
Title: V.P. Legal Affairs & General Counsel


<PAGE>

        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-1                                                    _____________ 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  ___________,  200_,  _________________  (_______)  fully paid and
non-assessable  common  shares,  no par value,  of the Company for an  aggregate
purchase  price of  $____________  (computed  on the basis of $_____ 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 _____,  200_,  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
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).


                                       1
<PAGE>

      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
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


                                       2
<PAGE>

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 expemption
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
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.


                                       3
<PAGE>

      IN WITNESS WHEREOF,  NORTH AMERICAN VACCINE,  INC. has caused this Warrant
to be signed by its Chief Executive Officer and President and its corporate seal
to be hereunto affixed and attested by its Secretary this ____ day of July 1999.

ATTEST:                                  NORTH AMERICAN VACCINE, INC.



_____________________________            By: _______________________________
[Corporate Seal]                             Randal Chase
                                             Chief Executive Officer & President


                                       4
<PAGE>

                  SUMMARY OF PRINCIPAL TERMS AND CONDITIONS
                  -----------------------------------------

                           NORTH AMERICAN VACCINE INC.

                                                                   JUNE 28, 1999

                                   TERM SHEET

THE TERMS AND CONDITIONS  SET FORTH HEREIN ARE FOR DISCUSSION  PURPOSES ONLY AND
MAY NOT BE  CONSTRUED  IN ANY WAY TO  REPRESENT  A  COMMITMENT  BY ROYAL BANK OF
CANADA TO PROVIDE  CREDIT OR TO ARRANGE A FACILITY.  THIS SUMMARY OF  INDICATIVE
TERMS AND CONDITIONS IS NOT INTENDED TO COVER ALL OF THE TERMS AND CONDITIONS OF
A DEFINITIVE TERM SHEET AND RELATED DOCUMENTATION THAT WILL BE NEGOTIATED IN DUE
COURSE.  THIS DOCUMENT IS CONFIDENTIAL AND IS FOR INTERNAL  DISCUSSION  PURPOSES
ONLY.

BORROWER:               North American Vaccine Inc., a  corporation organized
                        under the laws of Canada ("the Borrower")

LENDERS:                Royal Bank of Canada (the "Lender").

PURPOSE:                Bridge capital market debt or equity issue.

CREDIT FACILITY:        Up to a maximum of US$6,000,000 committed revolving
                        operating loan (the "Operating Loan").

AVAILABILITY:           Available by way of US rate loans ("USLoans") and/or
                        Libor loans ("LIBOR"). Libor loans must be for a minimum
                        of $US500,000  and in whole multiples of $US100,000; 2
                        days notice prior to funding.

INTEREST RATES:         US Base rate + 265bp
                        Libor + 265bp

INTEREST
PAYMENT DATES:          Interest periods for LIBOR Loans shall be, at the
                        Borrower's option, one, two or three months.
                        Interest on LIBOR Loans shall be payable on the last
                        business day of the applicable interest period for
                        such loans and, if earlier, the 90th day following
                        the commencement of such interest period.  Interest
                        on Prime Loans shall be payable monthly in arrears.

REPAYMENT:              No later than December 31, 1999.

MANDATORY
REPAYMENT:              100% of any debt or equity issue above $US21,000,000
                        to be applied as a permanent reduction of the Credit
                        Facility.


<PAGE>

"NORTH AMERICAN VACCINE, INC. - JUNE 28, 1999"                                 2


SECURITY:               Guarantee and Postponement of Claims for
                        $US6,000,000 from Biochem Pharma Inc. and Biochem
                        Pharma Holdings Inc. in favour of the Borrower.

DOCUMENTATION:          Letter loan agreement signed by the Borrower

CONDITIONS
PRECEDENT:              The obligation of the Bank to make available the
                        Borrowings to the Borrower is subject to and
                        conditional upon:

                        a)    Satisfactory credit documentation including
                              receipt of all necessary closing certificates
                              required by the Lender, including legal opinion
                              and security documentation.

                        b)    Satisfactory review of Y2K issue.

EVIDENCE OF
INDEBTEDNESS:           The Bank shall open and maintain at the Branch of
                        Account accounts and records evidencing the
                        Borrowings made available to the Borrower by the Bank
                        under this agreement.  The Bank shall record the
                        principal amount of such Borrowings, the payment of
                        principal and interest on account of the loans, and
                        all other amounts becoming due to the Bank under this
                        agreement.

                        The Bank's accounts and records constitute, in the
                        absence of manifest error, prima facie evidence of the
                        indebtedness of the Borrower to the Bank pursuant to
                        this agreement.

                        The Borrower authorises and directs the Bank to
                        automatically debit, by mechanical, electronic or manual
                        means, any bank account of the Borrower for all amounts
                        payable under this agreement, including but not limited
                        to, the repayment of principal and the payment of
                        interest, fees and all charges for the keeping of such
                        bank accounts.

REPRESENTATIONS
AND WARRANTIES:         Borrower shall provide representations and warranties
                        as customary for a transaction of this nature.

AFFIRMATIVE
COVENANTS:              The Borrower shall be subject to affirmative
                        covenants as customary for a transaction of this
                        nature, including, without limitation:

                        1.    Reporting requirements on the Borrower for annual
                              budgets, audited annual financial statements and
                              company-prepared monthly financial statements.

                        2.    Maintenance of a program of insurance for the
                              Borrower consistent with industry practice.

NEGATIVE
COVENANTS:              The Borrower shall be subject to negative covenants
                        as customary for a transaction of this nature,
                        including, without limitation:


<PAGE>

"NORTH AMERICAN VACCINE, INC. - JUNE 28, 1999"                                 3


                        1.    Prohibitions on any payments or capital
                              distributions.

EVENTS OF
DEFAULT:                The Borrower shall be subject to events of default as
                        customary for a transaction of this nature,
                        including, without limitation:

                        1.    Change of ownership whereby Biochem Pharma Inc.
                              cease to own at least (TO BE DETERMINED)
                              outstanding and issued voting shares of the
                              Borrower.

FEES AND EXPENSES:      The Borrower will pay all reasonable out of pocket
                        fees and expenses of the Lender in connection with
                        consummation of the Agreement.




                                     ROYAL BANK


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

R.W. SMITH                           ROYAL BANK OF CANADA
Senior Manager                       Multinational Accounts, Quebec Headquarters
                                     1 Place Ville-Marie, 8th  Floor, West Wing
                                     P.O. Box 6001
                                     Montreal, Quebec H3C 3A9
July 12, 1999
                                     Tel:  (514) 874-2815
                                     Fax:  (514) 874-5315

Mr. Lawrence J. Hineline
Vice President - Finance,
C/O NORTH AMERICAN VACCINE INC.
10150 Old Columbia Road
Columbia, MD
21046-2358

Dear Larry:

SUBJECT:  OFFER TO FINANCE

Further to our recent discussions, we are pleased to offer you financing subject
to the following terms and conditions:

BORROWER:               North  American  Vaccine Inc., a  corporation  organised
                        under the laws of Canada. ("the Borrower")

LENDERS:                Royal Bank of Canada (the "Lender").

PURPOSE:                Bridge capital market debt or equity issue.

CREDIT FACILITY:        Up  to  a maximum of  US$6,000,000  committed  revolving
                        operating loan (the "Operating Loan").

AVAILABILITY:           Available  by  way  of US Base Rate loans  ("US  Loans")
                        and/or Libor loans ("LIBOR").

INTEREST RATES:         US Base Rate + 265bp
                        Libor + 265bp

                        The  expression  "US Base Rate" means the annual rate of
                        interest  announced by the Bank from time to time as its
                        reference rate then in effect for  determining  interest
                        rates on U.S. dollar  commercial  loans made by the Bank
                        in Canada.


<PAGE>

"NORTH AMERICAN VACCINE INC. - JULY 12, 1999"                                 /2

INTEREST RATES:  (cont'd)
                        The  Borrower  shall pay  outstanding  accrued  interest
                        monthly on the date fixed by the Bank. Interest shall be
                        calculated  on  the  daily  principal   balance  at  the
                        aforementioned annual interest rates based on the actual
                        number of  calendar  days  elapsed  during the period in
                        which interest is calculated, divided by 365. The annual
                        rates  of  interest,   which  correspond  to  the  rates
                        calculated  as  aforesaid,  are the rates so  determined
                        multiplied  by the  actual  number of days in a calendar
                        year and divided by 365.  Outstanding  interest  payable
                        bears interest at the rate of interest applicable to the
                        relative  loan and is payable on demand.  Interest on US
                        Loans shall be payable monthly in arrears.

                        Interest  periods  for  LIBOR  Loans  shall  be,  at the
                        Borrower's option, one, two or three months. Interest on
                        LIBOR Loans shall be payable on the last business day of
                        the  applicable  interest  period for such loans and, if
                        earlier, the 90th day following the commencement of such
                        interest  period.  LIBOR  Loans must be for a minimum of
                        $US500,000  and in whole  multiples of  $US100,000.  Two
                        business  days  prior  to  drawdown  or  rollover,   the
                        Borrower  shall  advice the Bank of the next  applicable
                        LIBOR interest period.

REPAYMENT:              December 31, 1999.

MANDATORY
REPAYMENT:              100%  of  any debt or equity  issue above  $US21,000,000
                        to be applied  as a  permanent  reduction  of the Credit
                        Facility.

SECURITY:               Guarantee  and  Postponement of  Claims for $US6,000,000
                        from  Biochem  Pharma Inc. and Biochem  Pharma  Holdings
                        Inc. in favour of the Borrower.

DOCUMENTATION:          Letter  loan  agreement signed by the Borrower,  Biochem
                        Pharma Inc. and Biochem Pharma Holdings Inc..

CONDITIONS
PRECEDENT:              The  obligation  of  the  Bank  to  make  available  the
                        Borrowings to the Borrower is subject to and conditional
                        upon:

                        a)    Satisfactory   credit   documentation    including
                              receipt  of  all  necessary  closing  certificates
                              required by the Lender,  including  legal  opinion
                              and security documentation.

                        b)    Satisfactory review of Y2K issue.


<PAGE>

"NORTH AMERICAN VACCINE INC. - JULY 12, 1999"                                 /3

COVENANTS:              The Borrower covenants with the Bank as follows:

                        a)    The  Borrower   will  deliver  to  the  Bank  such
                              financial  and other  information  as the Bank may
                              reasonably require, including:

                              (i)  Audited  annual  financial  statements of the
                                   Borrower   within  90  days  of  its   fiscal
                                   year-end;

                              (ii) Annual budget of the Borrower  within 90 days
                                   of its fiscal year-end;

                              (iii)A monthly  in-house  financial  statement  of
                                   the Borrower within 30 days of month-end.

                        b)    The  Borrower  will  promptly  pay,  when due, all
                              income and other taxes payable.

                        c)    The Borrower agrees to remit, as prescribed  under
                              the  Income Tax Act  (Canada),  the  Taxation  Act
                              (Quebec)   and   any   other   applicable   fiscal
                              legislation,  all deductions and withholdings made
                              by the  Borrower,  as they  fall due and to notify
                              the Bank immediately upon failure to do so.

                        d)    The  Borrower   shall  maintain  of  an  insurance
                              program consistent with industry practice.

                        e)    The Borrower shall not declare or pay dividends on
                              the  common or  preferred  shares  of its  capital
                              without the prior written approval of the Bank.

PROVISIONS REGARDING
THE ENVIRONMENT:
                        a)    The Borrower  declares to the Bank that as of date
                              hereof:

                              -    it   fully   complies   with    environmental
                                   protection  laws,  regulations,   bylaws  and
                                   other requirements applicable to its property
                                   and activities;

                              -    it has obtained the environmental  protection
                                   certificates,       approvals,       permits,
                                   authorisations  and orders  required  for the
                                   use of its  property and for carrying out its
                                   activities, if applicable;


<PAGE>

"NORTH AMERICAN VACCINE INC. - JULY 12, 1999"                                 /4

PROVISIONS REGARDING
THE ENVIRONMENT:  (cont'd)

                              -    no  notice,  demand,  ordinance,  lawsuit  or
                                   complaint  was brought  against it concerning
                                   environmental protection;

                              -    to its  knowledge,  there is no  circumstance
                                   which may give rise to the  revocation of the
                                   aforesaid certificates,  approvals,  permits,
                                   authorisations  and orders or to the issue of
                                   a  notice,  demand,  ordinance,   lawsuit  or
                                   complaint as aforesaid, except for those that
                                   it fully disclosed to the Bank in writing.

                        b)    The  Borrower  shall  comply  strictly  and in all
                              respects with the  requirements  of  environmental
                              protection  laws,  regulations,  bylaws  and other
                              requirements   applicable   to  its  property  and
                              activities  and shall notify the Bank  immediately
                              in the event of any  release or  discovery  of any
                              contaminant   upon,  under,  over  or  within  its
                              property or any  contiguous  real  property or any
                              real property on or near which a contaminant could
                              reasonably be  anticipated to be released that may
                              affect its property and  activities.  The Borrower
                              shall  promptly  forward to the Bank copies of all
                              notices,   permits,   orders,   demands  or  other
                              documents  and  reports  in  connection  with  any
                              release or the presence of any  contaminant or any
                              matters relating to environmental  protection laws
                              or  otherwise  as they  affect  its  property  and
                              activities.

                        c)    The Borrower  shall provide the Bank,  upon demand
                              and  at  the  Borrower's  expense,  with  all  the
                              information  that the Bank may reasonably  require
                              regarding  the  environmental   situation  of  the
                              Borrower,   notably   concerning   the  Borrower's
                              activities,  moveable and immovable property,  and
                              all  contiguous  property  to its  properties,  if
                              applicable,   including  an  environmental   audit
                              report  prepared by an  environmental  engineering
                              firm acceptable to the Bank. It will be reasonable
                              for the  Bank to  periodically  request  from  the
                              Borrower  a   confirmation   that  the  statements
                              regarding  the  environment  contained  herein are
                              still  true  and  that  as of  the  date  of  such
                              confirmation, no event occurred that may affect in
                              any way its  property  and  activities  insofar as
                              environmental protection is concerned.


<PAGE>

"NORTH AMERICAN VACCINE INC. - JULY 12, 1999"                                 /5

PROVISIONS REGARDING
THE ENVIRONMENT:   (cont'd)

                        d)    The  Borrower  shall allow the Bank and its agents
                              access  to  its  property  or to  any  information
                              regarding its property or activities to enable the
                              Bank  to  assess  the  risk  that  the  Borrower's
                              environmental situation represents to the Bank, to
                              anticipate  its  effect  or  to  take   corrective
                              action.


                        e)    The  Borrower  shall  indemnify  and hold the Bank
                              harmless  against  and  from  any and all  claims,
                              suits,  actions,  damages,  costs,  judgements  or
                              other  expenses  sustained or incurred by the Bank
                              either in the exercise of the rights  conferred on
                              the Bank  herein,  or as  beneficiary  of security
                              against the property of the Borrower, or under any
                              other   circumstance   relating  to  environmental
                              protection  affecting the Borrower's  property and
                              activities.

                        All  above  covenants  shall  remain  in  force  for the
                        benefit of the Bank  regardless of the date advances are
                        made or security taken.

INDEMNITY:              If, in the  opinion  of the  Bank,  the Bank is now or
                        becomes subject to, or if there is a change in:

                        a)    any  reserve or similar  requirement  against  the
                              assets of the Bank,  deposits made with or for the
                              account of, credit extended by, or any acquisition
                              of funds for the extension of credit by, the Bank;

                        b)    any reserve or similar requirement with respect to
                              all or any part of the credit used by the Borrower
                              hereunder  or any  unused  portion  of the  credit
                              facilities;

                        c)    taxation,   or  the  basis  of  taxation,  of  any
                              payments  due to the Bank  hereunder  (except  for
                              taxes on the overall net income of the Bank);

                        d)    any requirement relating to capital adequacy; or

                        e)    any other  condition  prescribed  by law or by the
                              interpretation thereof by competent authority,  or
                              any other  condition,  whether  or not  having the
                              force of law,  with which  financial  institutions
                              carrying   on  business  in  Canada  are  or  were
                              generally complying;


<PAGE>

"NORTH AMERICAN VACCINE INC. - JULY 12, 1999"                                 /6

INDEMNITY:  (cont'd)
                              which in  the  sole   determination  of the  Bank,
                              causes:

                              (i)   an  additional  cost  with  respect  to  the
                                    credit facilities,

                              (ii)  a   reduction   in  the   revenues   derived
                                    therefrom, or

                              (iii) a   reduction   in  the   effective   return
                                    hereunder  or on  the  Bank's  capital  to a
                                    level  below  that which the Bank could have
                                    otherwise  achieved  (using  any  reasonable
                                    averaging and attribution method),

                        then, in any such event,  the Borrower  shall pay to the
                        Bank,  on demand,  the amount  which the Bank  considers
                        sufficient to compensate that additional cost, reduction
                        in  revenues,  or  reduction  in rate of return.  Absent
                        manifest error, the amount established by the Bank shall
                        be conclusive.

EVENTS OF DEFAULT:      Without  limiting   its  right  to  demand  at  any time
                        payment  of sums which are  payable on demand,  the Bank
                        may, to the extent  permitted by and in compliance  with
                        applicable law,  immediately  terminate the right of the
                        Borrower  to make  further  borrowings  under the credit
                        facilities,  and  demand  immediate  payment of all sums
                        owing  thereunder,   including  accrued  interest,   and
                        realise on all or any portion of the security granted in
                        its favor,  upon the  occurrence of any of the following
                        events:

                        a)    failure  by  the  Borrower  to pay the  principal,
                              interest or any other amount when due;

                        b)    failure by the  Borrower to observe or satisfy any
                              covenant, condition or provision in this agreement
                              or in any other agreement with the Bank, or in any
                              security  document  established  in  favor  of the
                              Bank;

                        c)    if   the   Borrower  becomes  insolvent,  files  a
                              notice  of  intention  to make a  proposal  to its
                              creditors under the BANKRUPTCY AND INSOLVENCY ACT,
                              is declared  bankrupt,  makes an assignment of its
                              property  for the  benefit  of its  creditors,  or
                              makes  a bulk  sale  of  any  part  of its  assets
                              without the prior consent of the Bank;


<PAGE>

"NORTH AMERICAN VACCINE INC. - JULY 12, 1999"                                 /7

EVENTS OF DEFAULT:  (cont'd)

                        d)    if any step is taken with  respect to a compromise
                              or arrangement with the creditors of the Borrower,
                              or to have the Borrower declared bankrupt or wound
                              up, or if a receiver is appointed  with respect to
                              any part of the property encumbered by security in
                              favor of the Bank,  or if any  encumbrances  takes
                              possession of any part of the Borrower's assets;

                        e)    if in the opinion of the Bank, there occurs:

                              (i)   a material  adverse change in the Borrower's
                                    financial condition;

                              (ii)  an  unacceptable  change in the ownership of
                                    the capital stock of the Borrower;

                              (iii) the Borrower is subject to legal proceedings
                                    detrimental to its affairs;

                        f)    the  breach  of  any  law,  regulation,  bylaw  or
                              requirement    whether    federal,     provincial,
                              municipal,  or otherwise,  concerning pollution of
                              the  environment,   toxic   materials,   or  other
                              environmental   hazards,   or  public  health  and
                              safety,  affecting any of the Borrower's  property
                              or activities.

                        g)    change of ownership  whereby  Biochem  Pharma Inc.
                              ceases  to own at  least  30%  of the  issued  and
                              outstanding voting shares of the Borrower.

EVIDENCE OF
INDEBTEDNESS:           The Bank  shall  open  and  maintain  at  the  Branch of
                        Account  accounts and records  evidencing the Borrowings
                        made  available  to the  Borrower by the Bank under this
                        agreement. The Bank shall record the principal amount of
                        such  Borrowings,  the payment of principal and interest
                        on account of the loans,  and all other amounts becoming
                        due to the Bank under this agreement.

                        The  Bank's  accounts  and  records  constitute,  in the
                        absence of manifest  error,  prima facie evidence of the
                        indebtedness  of the  Borrower  to the Bank  pursuant to
                        this agreement.


<PAGE>

"NORTH AMERICAN VACCINE INC. - JULY 12, 1999"                                 /8

EVIDENCE OF
INDEBTEDNESS:  (cont'd)
                        The  Borrower   authorises   and  directs  the  Bank  to
                        automatically debit, by mechanical, electronic or manual
                        means,  any bank account of the Borrower for all amounts
                        payable under this agreement,  including but not limited
                        to,  the  repayment  of  principal  and the  payment  of
                        interest,  fees and all  charges for the keeping of such
                        bank accounts.


FEES AND EXPENSES:      The  Borrower  will pay all  reasonable  out  of  pocket
                        fees and  expenses  of the  Lender  in  connection  with
                        consummation of the Agreement.

GOVERNING LAW:          This agreement  shall  be  governed by the laws in force
                        in the province of Quebec.

This Offer to  Finance  will be open for  acceptance  up to and  including  July
30,1999 after which time it will be null and void.

We trust the foregoing is satisfactory to you and request that you indicate your
acceptance by signing and returning the duplicate of this letter.

Yours truly,

ROYAL BANK OF CANADA



/s/ Rod Smith
- ----------------------------------

Read and accepted on this 15th day of July 1999.
                          ----
NORTH AMERICAN VACCINE INC.


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


By:    /s/ Daniel J. Abdun-Nabi
       -----------------------------
Name:  Daniel J. Abdun-Nabi
Title: Sr. Vice President


<PAGE>

"NORTH AMERICAN VACCINE INC. - JULY 12, 1999"                                 /9

Acknowledged on this 14th day of July 1999.
                     ----

BIOCHEM PHARMA INC.


By:    /s/ Frederick J. Andrew
       -----------------------------
Name:  Frederick J. Andrew
Title: Chief Financial Officer


By:    /s/ Francois Legault
       -----------------------------
Name:  Francois Legault
Title: Executive V.P. Corporate Development and Investments


BIOCHEM PHARMA HOLDINGS INC.


By:    /s/ Frederick J. Andrew
       ----------------------------
Name:  Frederick J. Andrew
Title: Treasurer



By:    /s/ Francois Legault
       ----------------------------
Name:  Francois Legault
Title: Vice President



<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 SIX
MONTHS ENDED JUNE 30, 1999 AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK>                         0000856573
<NAME>                        NORTH AMERICAN VACCINE INC. AND SUBSIDIARIES
<MULTIPLIER>                                   1,000

<S>                                             <C>
<PERIOD-TYPE>                                         6-MOS
<FISCAL-YEAR-END>                               DEC-31-1999
<PERIOD-START>                                  JAN-01-1999
<PERIOD-END>                                    JUN-30-1999
<CASH>                                                2,120
<SECURITIES>                                              0
<RECEIVABLES>                                         1,144
<ALLOWANCES>                                              0
<INVENTORY>                                           4,730
<CURRENT-ASSETS>                                      9,028
<PP&E>                                               62,031
<DEPRECIATION>                                       37,767
<TOTAL-ASSETS>                                       40,116
<CURRENT-LIABILITIES>                                11,715
<BONDS>                                             100,326
                                     0
                                           6,538
<COMMON>                                             90,387
<OTHER-SE>                                         (170,507)
<TOTAL-LIABILITY-AND-EQUITY>                         40,116
<SALES>                                               2,416
<TOTAL-REVENUES>                                      3,204
<CGS>                                                     0
<TOTAL-COSTS>                                        23,117
<OTHER-EXPENSES>                                          0
<LOSS-PROVISION>                                          0
<INTEREST-EXPENSE>                                    4,664
<INCOME-PRETAX>                                     (23,245)
<INCOME-TAX>                                              0
<INCOME-CONTINUING>                                 (23,245)
<DISCONTINUED>                                            0
<EXTRAORDINARY>                                           0
<CHANGES>                                                 0
<NET-INCOME>                                        (23,245)
<EPS-BASIC>                                         (0.72)
<EPS-DILUTED>                                         (0.72)



</TABLE>


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