NORTH AMERICAN VACCINE INC
8-K, 2000-05-09
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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                                  UNITED STATES

                       SECURITIES AND EXCHANGE COMMISSION

                              Washington, DC 20549

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

                                    FORM 8-K

                                 CURRENT REPORT
     Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

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


Date of Report (Date of earliest event reported):       March 30, 2000
                                                   ------------------------

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


           Canada                  1-10451                  98-0121241
 --------------------------   -------------------     ----------------------
(State or other jurisdiction  (Commission File No.)     (IRS Employer
  of incorporation)                                     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 name or former address, if changed since last report.)

                                          Exhibit Index is on page 2.


<PAGE>


ITEM 5.     OTHER EVENTS.

      On March 30, 2000, North American Vaccine,  Inc. (the "Company") settled a
lawsuit brought by Sharon Mates,  the Company's former  President,  and issued a
press release announcing the settlement.  The March 30 press release is attached
hereto as Exhibit 99.1.

      On March 31 and April 7, 10, 12,  14, and 17,  2000,  the  Company  issued
press releases regarding the status of its acquisition by Baxter  International,
Inc.  ("Baxter")  and  extensions of the maturity  date of the Company's  credit
facility  with the Bank of America,  N.A.  The March 31 and April 7, 10, 12, 14,
and 17 press releases are attached hereto as Exhibits 99.2,  99.3,  99.4,  99.5,
99.6, and 99.7, respectively.

      The Company signed  Amendment No. 1 to the Share Exchange  Agreement dated
as of April 17,  2000 which  amends  the Share  Exchange  Agreement  dated as of
November 17, 1999. Under the terms of the Share Exchange Agreement,  as amended,
the Company's  shareholders will receive $6.73 per share,  comprised of $6.70 of
Baxter common stock and $0.03 in cash.  The number of Baxter shares to be issued
to the Company's  shareholders under the Share Exchange  Agreement,  as amended,
will be set based upon the average closing sale price of Baxter common stock for
the ten trading days ending on the fifth  trading day prior to  consummation  of
the transaction.

      The transaction  continues to be subject to obtaining  certain  regulatory
approvals,   including,  among  others,  approvals  under  the  Canada  Business
Corporations  Act  relating  to the  proposed  transaction  and U.K.  regulatory
approval  of  the  Company's  group  C  meningococcal   conjugate  vaccine.  The
transaction is also subject to certain other conditions,  including satisfaction
of certain  production  goals, the nonoccurrence of a material adverse change in
the Company's business or performance,  and shareholder approval.  The Company's
principal  shareholders have entered into a Shareholder  Agreement,  as amended,
with  Baxter  pursuant  to  which  they  have  agreed  to  vote to  approve  the
transaction.  The transaction is expected to close in June, 2000; however,  this
is  a  forward-looking  statement  and  there  can  be  no  assurance  that  the
transaction  will  close at that  time or at all.  NAVA has  failed  to  satisfy
certain  conditions to closing.  Therefore,  Baxter has the option,  but not the
obligation to complete the transaction.

      The Company also signed an Assignment,  Acceptance and Amendment Agreement
dated as of April 17, 2000,  which,  among other things,  provides for up to $45
million in funding for the Company  operations  provided by BioChem  Pharma Inc.
("BioChem")  and Dr. Phillip Frost ("New  Financing").  This financing  includes
BioChem assuming the  approximately  $20 million utilized by the Company under a
line of credit provided by Bank of America,  N.A. and guaranteed by Baxter.  The
terms of the New Financing include,  among other things, a maturity date of June
30,  2000,  a rate of  interest  equal to 15% per annum on the unpaid  principal
amount of each loan under the New  Financing,  a deferred  funding  fee of up to
$11,250,000, a commitment fee of $50,000, and the release of Baxter as guarantor
of the financing.

      The foregoing  summary of the Share Exchange  Agreement,  as amended,  the
Shareholder  Agreement,  as amended, and certain related agreements is qualified
by  reference  to the copy of the Share  Exchange  Agreement,  as  amended,  the
Shareholder Agreement, as amended, and the other agreements included as exhibits
9 through 99.11 to this Form 8-K. The Share Exchange  Agreement,  as amended,
the Shareholder Agreement, as amended, and the other agreements are incorporated
in their entirety in this Item 5 by reference.



                                       2
<PAGE>

      On April 17, 2000,  the Company  issued a second press  release  regarding
modification of the Share Exchange  Agreement between the Company and Baxter and
establishment  of a new credit  facility.  The second April 17 press  release is
attached hereto as Exhibit 99.12.

ITEM 7.     FINANCIAL STATEMENTS AND EXHIBITS.

99.1.       Press release, dated March 30, 2000.

99.2.       Press release, dated March 31, 2000.

99.3.       Press release, dated April 7, 2000.

99.4.       Press release, dated April 10, 2000

99.5.       Press release, dated April 12, 2000.

99.6.       Press release, dated April 14, 2000.

99.7.       Press release No. 1, dated April 17, 2000.

99.8.       Amendment No. 1 to Share  Exchange  Agreement  dated as of April 17,
            2000.

99.9.       Amendment No. 1 to Shareholder Agreement dated as of April 17, 2000,
            among  Baxter,  BioChem,  and  certain  other  shareholders  of  the
            Company.

99.10.      Amended and  Restated  Warrant  Termination  Letter  dated April 17,
            2000.

99.11.      Assignment, Acceptance and Amendment Agreement dated as of April 17,
            2000 among the Bank of America, N.A., BioChem, the Company,  Baxter,
            and Dr. Phillip Frost.

99.12.      Press release No. 2, dated April 17, 2000.



                                       3
<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 hereunto duly authorized.

                        NORTH AMERICAN VACCINE, INC.

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

Dated:  May 9, 2000




RELEASE DATE: 3/30/00

NORTH AMERICAN VACCINE SETTLES MATES LAWSUIT

Columbia, Maryland - March 30, 2000, North American Vaccine (AMEX: NVX)
announced today that it has settled a lawsuit brought by Sharon Mates, the
Company's former President. Terms of the settlement are confidential.

Neil Flanzraich, Chairman of the Board of Directors of North American Vaccine,
stated: "We are pleased to resolve this dispute with Dr. Mates, who was
instrumental in the Company's development. We thank Dr. Mates for her
contributions to the Company and wish her well in her future endeavors."

Under Dr. Mates' leadership, the Company's first product, Certiva(R) was
approved by the Food and Drug Administration (FDA) for marketing in the United
States. Certiva(R) is indicated for active immunization against diphtheria,
tetanus and pertussis in infants and children from 6 weeks to 7 years of age.
With the approval of Certiva(R), North American Vaccine, Inc. has become the
first independent vaccine manufacturer in more than a decade to receive FDA
approval for a new childhood vaccine. A European formulation of Certiva(R)
(Certiva(R)-EU) was approved in several countries in Europe.

Dr. Mates established the development and collaborative programs for the
Company's conjugate vaccines, and guided the development of the Company's
combination vaccines. The first combination vaccine of the Company, combining
its DTaP with an injectable polio vaccine (DTaP-IPV), received marketing
authorization through the European mutual recognition procedure and led to
national product approvals in several European countries.

The lawsuit filed by Dr. Mates in November 1998 included claims against the
Company, two of its directors and an affiliate, BioChem Pharma, Inc. In June
1999, the U.S. District Court in Maryland dismissed all claims alleged in the
litigation. Dr. Mates filed an appeal, which was pending at the time that the
case was settled.

North American Vaccine, Inc. is engaged in the research, development, production
and sales of vaccines for the prevention of human infectious diseases. North
American Vaccine news releases are available on the Company's web site at
http://www.nava.com.

CONTACT: Tom Newberry, Director, Investor Relations, North American Vaccine,
Inc., 10150 Old Columbia Road, Columbia, Maryland 21046 (410) 309-7121.



RELEASE DATE: 3/31/00

BAXTER AGREES TO EXTEND LOAN MATURITY TO APRIL 7 AS DISCUSSIONS CONTINUE

Columbia, Maryland - March 31, 2000, North American Vaccine (AMEX: NVX)
announced today that it is continuing to discuss with Baxter International Inc.
matters in connection with the Share Exchange Agreement. Baxter has proposed
that the parties modify the existing Share Exchange Agreement based on concerns
which include the Company's failure to complete manufacturing of a two month
supply of NeisVac-C(TM) and obtain United Kingdom regulatory approval for
NeisVac-C(TM) prior to the specified April 1 deadline. The Company's Board of
Directors is considering its options during these discussions.

The discussions have involved proposals that include, among other things, a
reduction in the purchase price, the terms under which additional financing
would be available to the Company, an extension of the date by which conditions
to closing are to be satisfied, additional conditions to closing and changes to
existing conditions to closing, the outside date for termination of the Share
Exchange Agreement, and an early termination of the Share Exchange Agreement.
There can be no assurances as to whether the Company and Baxter will reach an
agreement with respect to a mutually acceptable modification to the Share
Exchange Agreement or mutually acceptable termination arrangements or as to the
timing of any such agreement. If the parties are unable to reach such an
agreement and Baxter determines not to waive the conditions to closing which the
Company is unable to meet, Baxter will not be obligated to close on the
acquisition transaction and the Company will continue to be bound by the terms
of the Share Exchange Agreement through at least May 31, 2000. Baxter has
advised the Company that it does not intend to terminate the Share Exchange
Agreement. The parties have agreed to an extension of the maturity of the
Company's credit facility with the Bank of America so that the credit facility
will come due and payable on April 7, 2000 rather than March 31, 2000 in order
to facilitate further discussions by Baxter and the Company. The line of credit
is secured by a pledge of all of the Company's otherwise unencumbered assets.
There can be no assurances that the maturity of the credit facility will be
extended further or that the Company will be able to refinance this indebtedness
or obtain financing for its continued operations. If the Company cannot obtain
financing, there can be no assurance that the Company can continue its
operations for any period of time without seeking bankruptcy protection.

North American Vaccine, Inc. is engaged in the research, development, production
and sales of vaccines for the prevention of human infectious diseases. North
American Vaccine news releases are available on the Company's web site at
http://www.nava.com.

This press release contains certain forward looking statements, which are made
pursuant to the safe harbor provisions of the Securities Litigation Reform Act
of 1995, including discussions on modifying the Share Exchange Agreement,
prospects for completing discussions with Baxter, and prospects for financing.
Investors are cautioned that forward looking statements involve risks and
uncertainties that may affect the Company's business and prospects, including
developing mutually acceptable modifications to the Share Exchange Agreement
with Baxter, successfully completing any contemplated transaction, developing

<PAGE>

alternative financing, and all as discussed in the Company's filings with the
U.S. Securities and Exchange Commission, including its annual reports on Form
10-K, quarterly reports on Form 10-Q and current reports on Form 8-K.

CONTACT: Tom Newberry, Director, Investor Relations, North American Vaccine,
Inc., 10150 Old Columbia Road, Columbia, MD 21046, (410) 309-7121.


                                        2



RELEASE DATE: 4/7/00

BAXTER AGREES TO EXTEND LOAN MATURITY TO APRIL 10 AS DISCUSSIONS WITH NORTH
AMERICAN VACCINE CONTINUE

Columbia, Maryland - April 7, 2000, North American Vaccine (AMEX: NVX) announced
today that it is continuing to discuss with Baxter International Inc. matters in
connection with the Share Exchange Agreement. The parties have agreed to a
second extension of the maturity of the Company's credit facility with the Bank
of America so that the credit facility will come due and payable on April 10,
2000 rather than April 7, 2000 in order to facilitate further discussions.
Baxter has proposed that the parties modify the existing Share Exchange
Agreement based on concerns which include the Company's failure to complete
manufacturing of a two month supply of NeisVac-C(TM) and obtain United Kingdom
regulatory approval for NeisVac-C(TM) prior to the specified April 1 deadline.
The Company's Board of Directors is considering its options during these
discussions. There can be no assurances as to whether the Company and Baxter
will reach an agreement with respect to a mutually acceptable modification to
the Share Exchange Agreement or mutually acceptable termination arrangements or
as to the timing of any such agreement.

North American Vaccine, Inc. is engaged in the research, development, production
and sales of vaccines for the prevention of human infectious diseases. North
American Vaccine news releases are available on the Company's web site at
http://www.nava.com.

This press release contains certain forward looking statements, which are made
pursuant to the safe harbor provisions of the Securities Litigation Reform Act
of 1995, including discussions on modifying the Share Exchange Agreement,
prospects for completing discussions with Baxter, and prospects for financing.
Investors are cautioned that forward looking statements involve risks and
uncertainties that may affect the Company's business and prospects, including
developing mutually acceptable modifications to the Share Exchange Agreement
with Baxter, successfully completing any contemplated transaction, developing
alternative financing, and all as discussed in the Company's filings with the
U.S. Securities and Exchange Commission, including its annual reports on Form
10-K, quarterly reports on Form 10-Q and current reports on Form 8-K.

CONTACT: Tom Newberry, Director, Investor Relations, North American Vaccine,
Inc., 10150 Old Columbia Road, Columbia, MD 21046, (410) 309-7121.



RELEASE DATE: 4/10/00

BAXTER AGREES TO EXTEND NORTH AMERICAN VACCINE LOAN MATURITY TO APRIL 12

Columbia, Maryland - April 10, 2000, North American Vaccine (AMEX: NVX)
announced today that it is continuing to discuss with Baxter International Inc.
matters in connection with the Share Exchange Agreement. The parties have agreed
to a third extension of the maturity of the Company's credit facility with the
Bank of America so that the credit facility will come due and payable on April
12, 2000 rather than April 10, 2000 in order to facilitate further discussions.
The Company believes that these discussions will be completed by April 12, 2000.
Baxter has proposed that the parties modify the existing Share Exchange
Agreement based on concerns which include the Company's failure to complete
manufacturing of a two month supply of NeisVac-C(TM) and obtain United Kingdom
regulatory approval for NeisVac-C(TM) prior to the specified April 1 deadline.
The Company's Board of Directors is considering its options during these
discussions. There can be no assurances as to whether the Company and Baxter
will reach an agreement with respect to a mutually acceptable modification to
the Share Exchange Agreement or mutually acceptable termination arrangements or
as to the timing of any such agreement.

North American Vaccine, Inc. is engaged in the research, development, production
and sales of vaccines for the prevention of human infectious diseases. North
American Vaccine news releases are available on the Company's web site at
http://www.nava.com.

This press release contains certain forward looking statements, which are made
pursuant to the safe harbor provisions of the Securities Litigation Reform Act
of 1995, including discussions on modifying the Share Exchange Agreement,
prospects for completing discussions with Baxter, and prospects for financing.
Investors are cautioned that forward looking statements involve risks and
uncertainties that may affect the Company's business and prospects, including
developing mutually acceptable modifications to the Share Exchange Agreement
with Baxter, successfully completing any contemplated transaction, developing
alternative financing, and all as discussed in the Company's filings with the
U.S. Securities and Exchange Commission, including its annual reports on Form
10-K, quarterly reports on Form 10-Q and current reports on Form 8-K.

CONTACT: Tom Newerry, Director, Investor Relations, North American Vaccine,
Inc., 10150 Old Columbia Road, Columbia, MD 21046, 410-309-7121.





      RELEASE DATE: 4/12/00

      BAXTER AGREES TO EXTEND NORTH  AMERICAN  VACCINE LOAN MATURITY TO APRIL 13

      Columbia,  Maryland - April 12, 2000, North American  Vaccine (AMEX:  NVX)
      announced today that it is continuing to discuss with Baxter International
      Inc. matters in connection with the Share Exchange Agreement.  The parties
      have agreed to a fourth  extension of the maturity of the Company's credit
      facility  with the Bank of America so that the credit  facility  will come
      due and  payable on April 13,  2000 rather than April 12, 2000 in order to
      facilitate  further  discussions.  Baxter has  proposed  that the  parties
      modify the  existing  Share  Exchange  Agreement  based on concerns  which
      include the  Company's  failure to complete  manufacturing  of a two month
      supply of NeisVac-C(TM) and obtain United Kingdom regulatory  approval for
      NeisVac-C(TM) prior to the specified April 1 deadline. The Company's Board
      of Directors is considering  its options during these  discussions.  There
      can be no  assurances  as to whether  the Company and Baxter will reach an
      agreement with respect to a mutually acceptable  modification to the Share
      Exchange Agreement or mutually acceptable  termination  arrangements or as
      to the timing of any such agreement.

      North  American  Vaccine,  Inc. is engaged in the  research,  development,
      production  and sales of vaccines for the  prevention of human  infectious
      diseases.  North  American  Vaccine  news  releases  are  available on the
      Company's web site at http://www.nava.com.

      This press release contains certain forward looking statements,  which are
      made pursuant to the safe harbor  provisions of the Securities  Litigation
      Reform Act of 1995, including  discussions on modifying the Share Exchange
      Agreement, prospects for completing discussions with Baxter, and prospects
      for  financing.  Investors are cautioned that forward  looking  statements
      involve risks and uncertainties that may affect the Company's business and
      prospects,  including developing mutually acceptable  modifications to the
      Share  Exchange  Agreement  with  Baxter,   successfully   completing  any
      contemplated  transaction,  developing alternative  financing,  and all as
      discussed in the Company's  filings with the U.S.  Securities and Exchange
      Commission,  including its annual reports on Form 10-K,  quarterly reports
      on Form 10-Q and current reports on Form 8-K.

      CONTACT:  Tom  Newberry,  Director,  Investor  Relations,  North  American
      Vaccine,   Inc.,   10150   Old   Columbia   Road,   Columbia,   MD  21046,
      (410)-309-7121.


RELEASE DATE: 4/14/00

BAXTER AGREES TO EXTEND NORTH AMERICAN VACCINE LOAN MATURITY TO APRIL 14

Columbia, Maryland - April 14, 2000, North American Vaccine (AMEX: NVX)
announced today that it is continuing to discuss with Baxter International Inc.
matters in connection with the Share Exchange Agreement. The parties have agreed
to a fifth extension of the maturity of the Company's credit facility with the
Bank of America so that the credit facility will come due and payable on April
14, 2000 rather than April 13, 2000 in order to facilitate further discussions.
Baxter has proposed that the parties modify the existing Share Exchange
Agreement based on concerns which include the Company's failure to complete
manufacturing of a two month supply of NeisVac-C(TM) and obtain United Kingdom
regulatory approval for NeisVac-C(TM) prior to the specified April 1 deadline.
The Company's Board of Directors is considering its options during these
discussions. There can be no assurances as to whether the Company and Baxter
will reach an agreement with respect to a mutually acceptable modification to
the Share Exchange Agreement or mutually acceptable termination arrangements or
as to the timing of any such agreement.

North American Vaccine, Inc. is engaged in the research, development, production
and sales of vaccines for the prevention of human infectious diseases. North
American Vaccine news releases are available on the Company's web site at
http://www.nava.com.

This press release contains certain forward looking statements, which are made
pursuant to the safe harbor provisions of the Securities Litigation Reform Act
of 1995, including discussions on modifying the Share Exchange Agreement,
prospects for completing discussions with Baxter, and prospects for financing.
Investors are cautioned that forward looking statements involve risks and
uncertainties that may affect the Company's business and prospects, including
developing mutually acceptable modifications to the Share Exchange Agreement
with Baxter, successfully completing any contemplated transaction, developing
alternative financing, and all as discussed in the Company's filings with the
U.S. Securities and Exchange Commission, including its annual reports on Form
10-K, quarterly reports on Form 10-Q and current reports on Form 8-K.

CONTACT: Tom Newberry, Director, Investor Relations, North American Vaccine,
Inc., 10150 Old Columbia Road, Columbia, MD 21046, (410)-309-7121.




RELEASE DATE: 4/17/00

BAXTER AGREES TO EXTEND NORTH AMERICAN VACCINE LOAN MATURITY TO APRIL 17

Columbia, Maryland - April 17, 2000, North American Vaccine (AMEX: NVX)
announced today that it is continuing to discuss with Baxter International Inc.
matters in connection with the Share Exchange Agreement. The parties have agreed
to a sixth extension of the maturity of the Company's credit facility with the
Bank of America so that the credit facility will come due and payable on April
17, 2000 rather than April 14, 2000 in order to facilitate further discussions.
Baxter has proposed that the parties modify the existing Share Exchange
Agreement based on concerns which include the Company's failure to complete
manufacturing of a two month supply of NeisVac-C(TM) and obtain United Kingdom
regulatory approval for NeisVac-C(TM) prior to the specified April 1 deadline.
The Company's Board of Directors is considering its options during these
discussions. There can be no assurances as to whether the Company and Baxter
will reach an agreement with respect to a mutually acceptable modification to
the Share Exchange Agreement or mutually acceptable termination arrangements or
as to the timing of any such agreement.

North American Vaccine, Inc. is engaged in the research, development, production
and sales of vaccines for the prevention of human infectious diseases. North
American Vaccine news releases are available on the Company's web site at
http://www.nava.com.

This press release contains certain forward looking statements, which are made
pursuant to the safe harbor provisions of the Securities Litigation Reform Act
of 1995, including discussions on modifying the Share Exchange Agreement,
prospects for completing discussions with Baxter, and prospects for financing.
Investors are cautioned that forward looking statements involve risks and
uncertainties that may affect the Company's business and prospects, including
developing mutually acceptable modifications to the Share Exchange Agreement
with Baxter, successfully completing any contemplated transaction, developing
alternative financing, and all as discussed in the Company's filings with the
U.S. Securities and Exchange Commission, including its annual reports on Form
10-K, quarterly reports on Form 10-Q and current reports on Form 8-K.

CONTACT: Tom Newberry, Director, Investor Relations, North American Vaccine,
Inc., 10150 Old Columbia Road, Columbia, MD 21046, (410)309-7121.



                                                                  EXECUTION COPY

                               AMENDMENT NO. 1 TO
                            SHARE EXCHANGE AGREEMENT

      Amendment No. 1 dated as of April 17, 2000 (this "AMENDMENT") to the Share
Exchange Agreement dated as of November 17, 1999 (the "SHARE EXCHANGE
AGREEMENT") among Baxter International Inc., a Delaware corporation ("PARENT"),
Neptune Acquisition Corp., an unlimited liability company existing under the
laws of the Province of Nova Scotia and a wholly-owned subsidiary of Parent
("ACQUIRECO"), and North American Vaccine, Inc., a corporation existing under
the federal laws of Canada ("COMPANY") (capitalized terms used and not otherwise
defined herein shall have the respective meanings set forth in the Share
Exchange Agreement described below):

                                   WITNESSETH:

      WHEREAS, Parent, Acquireco and Company desire to amend the Share Exchange
Agreement as set forth in this Amendment;

      WHEREAS, concurrently with the execution of this Amendment and as an
inducement to Parent and Acquireco to enter into this Amendment: (i) Bank of
America, N.A. ("BOFA") and BioChem Pharma Inc. ("BIOCHEM"), after receipt of a
request and proposal from Company, have agreed to an assignment of BofA's
interest in certain Interim Financing Documents to BioChem and Parent and BofA
and Company have agreed to terminate certain Interim Financing Documents
(including without limitation the Guaranty by Parent on behalf of Company dated
November 1, 1999), in each case substantially on the terms and subject to the
conditions set forth in Exhibit A hereto; (ii) Parent and certain shareholders
of Company have agreed to amend the Company Shareholder Agreement substantially
on the terms and subject to the conditions set forth in Exhibit B hereto
("AMENDMENT NO. 1 TO COMPANY SHAREHOLDER AGREEMENT"); (iii) Parent and Company
have agreed to amend the Technical Services Agreement dated February 4, 2000
substantially on the terms and subject to the conditions set forth in Exhibit C
hereto; and (iv) Parent, BioChem and Company have agreed to amend and restate
the Warrant Termination Letter substantially on the terms and subject to the
conditions set forth in Exhibit D hereto;

      WHEREAS, the parties acknowledge that (i) the amendments and modifications
contemplated by this Amendment do not amend or modify the closing conditions
contained in Section 8.03 of the Share Exchange Agreement, (ii) certain closing
conditions contained in Section 8.03 of the Share Exchange Agreement will not be
satisfied by Company in accordance with their terms, (iii) in order to effect
the Arrangement and consummate the transactions contemplated by the Share
Exchange Agreement, Parent would be required to waive such conditions to
closing, (iv) Parent has not granted a waiver, and the execution and delivery by
Parent of this Amendment does not constitute a waiver, of such closing
conditions, and (v) Parent reserves the right, in its sole discretion, to waive
each closing condition contained in Section 8.03 of the Share Exchange
Agreement;

<PAGE>

      WHEREAS, the parties acknowledge that, as of the date hereof, (i) the
Registration Statement has not become effective and Company has not mailed the
Proxy Statement to the shareholders of Company, and (ii) such facts do not
constitute a breach of the respective obligations of Parent or Company under
Section 7.01(a) of the Share Exchange Agreement;

      WHEREAS, the board of directors of Company has determined that the Share
Exchange Agreement as amended or modified by this Amendment is fair and in the
best interests of the Company and the shareholders of Company;

      NOW, THEREFORE, in consideration of the foregoing, and other good and
valuable consideration, the receipt and adequacy of which are hereby
acknowledged, and intending to be legally bound hereby, the parties hereto
hereby agree as follows:

      1. The definition of Interim Financing Documents contained in Section 1.01
is hereby amended and restated to read as follows:

            ""INTERIM FINANCING DOCUMENTS" shall mean the following documents
      dated as of November 1, 1999 and assigned from Bank of America, N.A. to
      BioChem Pharma Inc. on April 17, 2000:  (i) Letter Loan Agreement
      between Bank of America, N.A. ("LENDER") and Company; (ii) Security
      Agreement between Lender and Company; (iii) Patent and Trademark
      Assignment and Security Agreement between Lender and Company; and (iv)
      Assignment, Acceptance and Amendment Agreement dated April 17, 2000
      among Company, Dr. Phillip Frost, Bank of America, N.A., BioChem Pharma
      Inc. and Parent."

      2. Section 3.01(a)(i) of the Share Exchange Agreement is hereby amended
and restated in its entirety to read as follows:

            "(i) the fraction of a share (calculated and rounded to the nearest
      ten-thousandth of one share) of Common Stock, par value $1.00 per share,
      of Parent ("PARENT COMMON STOCK"), (A) the numerator of which fraction
      shall be $6.70 (the "SHARE CONSIDERATION"), and (B) the denominator of
      which shall be the Parent Stock Price (as defined in Section 3.01(a)(iii)
      below); and"

      3. Section 3.01(f) of the Share Exchange Agreement is hereby amended and
restated in its entirety to read as follows:

            "(f) Immediately following the exchange of shares as contemplated by
      this Section 3.01, Company shall increase the stated capital of the
      Company Common Shares by an amount equal to the difference between (i) the
      product of the number of Company Common Shares exchanged pursuant to this
      Section 3.01 multiplied by $6.73 and (ii) the product of the paid-up
      capital of an issued and outstanding Company Common Share as determined
      pursuant to the Income Tax Act (Canada) immediately prior to the increase
      in stated capital pursuant to this Section 3.01(g), multiplied by the
      number of Company Common Shares exchanged pursuant to this Section 3.01."



                                       2
<PAGE>

      4. Section 3.01(g) of the Share Exchange Agreement is hereby amended and
restated in its entirety to read as follows:

            "(g) Immediately following the exchange of shares as contemplated by
      this Section 3.01, the Company shall increase the stated capital of the
      Company Preferred Shares by an amount equal to the difference between (i)
      the product of the number of Company Preferred Shares exchanged pursuant
      to this Section 3.01 multiplied by the number of Company Common Shares
      into which each Company Preferred Share is convertible immediately before
      the Effective Time multiplied by $6.73 and (ii) the product of the paid-up
      capital of an issued and outstanding Company Preferred Share as determined
      pursuant to the Income Tax Act (Canada) immediately prior to the increase
      in stated capital pursuant to this Section 3.01(g), multiplied by the
      number of Company Preferred Shares exchanged pursuant to this Section
      3.01."

      5. Section 4.08 of the Share Exchange Agreement is hereby amended and
restated in its entirety as follows:

            6. "SECTION 4.08 ABSENCE OF CERTAIN CHANGES OR EVENTS. Except for
      the transactions contemplated by Amendment No. 1 dated April 17, 2000 to
      this Agreement (including the transactions contemplated by the exhibits
      thereto), and except as otherwise set forth on Schedule 4.08 - of the
      Company Disclosure Schedule, since June 30, 1999, Company and the Company
      Subsidiaries have conducted their businesses only in the ordinary course
      consistent with past practice and, since such date, there has not been (i)
      any Company Material Adverse Effect, (ii) any event that may reasonably be
      expected to prevent or materially delay the performance of Company's
      obligations pursuant to this Agreement and the completion of the
      Arrangement by Company, (iii) any change by Company in its accounting
      methods, principles or practices, (iv) any declaration, setting aside or
      payment of any dividend or distribution in respect of the Company Common
      Shares or any redemption, purchase or other acquisition of any of
      Company's securities, (v) any increase in the compensation or benefits or
      establishment of any bonus, insurance, severance, deferred compensation,
      pension, retirement, profit sharing, stock option (including, without
      limitation, the granting of stock options, stock appreciation rights,
      performance awards or restricted stock awards), stock purchase or other
      employee benefit plan, or any other increase in the compensation payable
      or to become payable to any officers, directors or employees of Company or
      any Company Subsidiary, (vi) any issuance or sale of any stock, notes,
      bonds or other securities other than pursuant to the exercise of
      outstanding securities, or entering into any agreement with respect
      thereto, (vii) any amendment to the Company's certificate of incorporation
      or bylaws, (viii) other than in the ordinary course of business, any (x)
      purchase, sale, assignment or transfer of any material assets, (y)
      mortgage, pledge or the institution of any Encumbrance on any material
      assets or properties, tangible or intangible, except for liens for taxes
      not yet delinquent and such other Encumbrances which do not, individually
      or in the aggregate, have a Company Material Adverse Effect, or (z) waiver
      of any rights of material value or cancellation or any material debts or
      claims, (ix) any incurrence of any material liability (absolute or
      contingent), except for current liabilities and obligations incurred in
      the ordinary course of business consistent with past practice, (x) any
      incurrence of any damage, destruction or similar loss, whether or not


                                       3
<PAGE>

      covered by insurance, materially affecting the business or properties of
      Company or any Company Subsidiary, or (xi) any entering into any
      transaction of a material nature other than in the ordinary course of
      business, consistent with past practices."

      7. Section 4.18 of the Share Exchange Agreement is hereby amended and
restated in its entirety to read as follows:

            "SECTION 4.18 OPINION OF FINANCIAL ADVISOR. Morgan Stanley & Co.
      Incorporated ("COMPANY FINANCIAL ADVISOR") has delivered to the board of
      directors of Company its opinion, as amended to reflect Amendment No. 1 to
      this Agreement dated April 17, 2000, to the effect that the consideration
      to be received under the Arrangement by the holders of Company Common
      Shares is fair to such holders from a financial point of view."

      8. Section 6.01(h) of the Share Exchange Agreement is hereby amended and
restated in its entirety to read as follows:

            "increase the compensation payable or to become payable to its
      directors, officers, consultants or employees, grant any rights to
      severance or termination pay to, or enter into any employment or severance
      agreement which provides benefits upon a change in control of Company that
      would be triggered by the Arrangement with, any director, officer,
      consultant or other employee of Company or any Company Subsidiary who is
      not currently entitled to such benefits from the Arrangement, establish,
      adopt, enter into or amend any collective bargaining, bonus, profit
      sharing, thrift, compensation, stock option, restricted stock, pension,
      retirement, deferred compensation, employment, termination, severance or
      other plan, agreement, trust, fund, policy or arrangement for the benefit
      of any director, officer, consultant or employee of Company or any Company
      Subsidiary, except to the extent required by applicable Law or the terms
      of a collective bargaining agreement, or enter into or amend any contract,
      agreement, commitment or arrangement between Company or any Company
      Subsidiary and any of Company's directors, officers, consultants or
      employees; provided, HOWEVER, that notwithstanding the foregoing, Company
      may, after consultation with Parent, provide additional benefits
      (including increases in compensation or bonuses) to key employees to the
      extent reasonably necessary to retain such employees until the Effective
      Date, provided that (i) in no event shall such benefits in the aggregate
      exceed $1,300,000, (ii) such benefits shall be payable to employees on the
      earlier to occur of (x) July 15, 2000 or (y) immediately prior to the
      Effective Date, and (iii) Company may make commitments to its employees to
      provide additional benefits to such employees in the event this Agreement
      is terminated and the Arrangement is not completed."

      9. Section 7.01(b) of the Share Exchange Agreement is hereby amended and
restated in its entirety to read as follows:

            "(b) The Proxy Statement shall include (i) the recommendation of the
      board of directors of Company to Company's shareholders that they vote in
      favor of approval of the Arrangement Resolution and (ii) the opinion of


                                       4
<PAGE>

      Company Financial Advisor, as amended, and referred to in Section 4.18;
      PROVIDED, HOWEVER, that the board of directors of Company shall submit the
      Arrangement Resolution to Company's shareholders whether or not at any
      time subsequent to the date hereof such board determines that it can no
      longer make such recommendation, unless this Agreement has been terminated
      in accordance with Article IX."

      10. Section 9.01(b) of the Share Exchange Agreement is hereby amended and
restated in its entirety to read as follows:

            "(b) by either Parent or Company, if the Effective Time shall not
      have occurred on or before June 30, 2000, unless the Effective Time shall
      not have occurred on or before such date solely because (i) the filing of
      the Articles of Arrangement has been postponed in accordance with Section
      2.05 or (ii) the Final Order shall not have been received (provided that
      the parties shall have submitted the Final Order and Parent shall have
      unconditionally agreed to consummate the Arrangement upon receipt of the
      Final Order) provided, further, that, in each case, such date shall not be
      extended more than fifteen (15) days; PROVIDED, HOWEVER, that the right to
      terminate this Agreement under this Section 9.01(b) shall not be available
      to any party whose failure to fulfill any obligation under this Agreement
      shall have caused, or resulted in, the failure of the Effective Time to
      occur on or before such date;"

      11. Section 9.01(f) of the Share Exchange Agreement is hereby amended and
restated in its entirety to read as follows:

            "(f) by Parent, 10 days after receipt by Company of a written notice
      from Parent of (i) a breach of any representation, warranty, covenant or
      agreement in any material respect on the part of Company set forth in this
      Agreement, or if any representation or warranty of Company shall have
      become untrue, incomplete or incorrect in any material respect, in either
      case such that the conditions set forth in Section 8.03 would not be
      satisfied, or (ii) the occurrence of a Default or Event of Default (as
      such terms are defined in the Interim Financing Documents) under the
      Interim Financing Documents and the exercise of remedies by the Lender in
      connection therewith (each, a "TERMINATING COMPANY BREACH"); PROVIDED,
      HOWEVER, that if such Terminating Company Breach is curable by Company
      through the exercise of its reasonable efforts within 10 days and for so
      long as Company continues to exercise such reasonable efforts, Parent may
      not terminate this Agreement under this Section 9.01(f); and PROVIDED,
      FURTHER that the preceding proviso shall not in any event be deemed to
      extend any date set forth in paragraph (b) of this Section 9.01;"

      12. The definition of Company Shareholder Agreement contained in the sixth
recital of the Share Exchange Agreement shall be amended to include Amendment
No. 1 to Company Shareholder Agreement.

      13. Annex A to the Share Exchange Agreement is hereby amended and restated
in its entirety to read as set forth in Exhibit E hereto;



                                       5
<PAGE>

      14. Notwithstanding anything to the contrary contained in this Amendment
or the Share Exchange Agreement, Parent hereby consents to the execution and
delivery of the Interim Financing Documents, as amended on the date hereof
(including, without limitation, the transfer of the security interests
contemplated by such amendment), PROVIDED, HOWEVER, that Company shall (i)
submit to Parent and BioChem Pharma Inc. on a weekly basis a written estimate of
the proposed expenditures of Company and the Company Subsidiaries for such
period, (ii) provide Parent with written notice at least six (6) business days
prior to incurring any additional indebtedness pursuant to Schedule A, Part I of
the Assignment, Acceptance and Amendment Agreement dated April 17, 2000 among
Company, Dr. Phillip Frost, Bank of America, N.A., BioChem Pharma Inc. and
Parent, and, if Parent offers to provide financing to Company on identical or
more favorable terms to Company, Company will enter into such financing with
Parent rather than with Dr. Phillip Frost, and (iii) provide Parent with written
notice at least two (2) business days prior to incurring any other additional
indebtedness pursuant to the Interim Financing Documents.

      15. Company hereby grants to Parent a right of first offer to purchase any
Debt Securities (as hereinafter defined) which Company may, from time to time,
propose to issue between the date hereof and the Effective Date. In the event
Company proposes to issue any Debt Securities, it shall give Parent written
notice of its intention. Parent shall have five (5) business days after any such
notice is effective to deliver a written notice to Company proposing to Company
the material terms under which it would agree to purchase such Debt Securities.
In the event Company does not accept such offer, or if no such offer is made to
Company by Parent, Company shall have twenty (20) days thereafter to enter into
an agreement to issue the Debt Securities respecting which Parent's right of
first offer option set forth in this Section 14 was not accepted, upon terms no
more favorable to the purchaser or lender thereof than specified in Parent's
notice to Company pursuant to this Section 14. In the event Company has not
issued Debt Securities within said twenty (20) day period, Company shall not
thereafter issue or sell any Debt Securities without first giving Parent the
opportunity to purchase such securities from Company in the manner provided in
this Section 14. As used herein, "DEBT SECURITIES" shall mean any line of credit
or evidence of indebtedness of Company other than (i) with respect to trade
payables or (ii) pursuant to the Interim Financing Documents.

      16. Notwithstanding anything to the contrary contained in this Amendment
or the Share Exchange Agreement, between the date hereof and the Effective Date,
Company shall use commercially reasonable efforts not to exceed the total
spending projections through June 30, 2000 set forth in the projections
delivered to Parent concurrently herewith as Schedule A to the Company
Disclosure Schedule and to otherwise operate Company's business in accordance
with such projections.

      17. This Amendment shall be deemed an amendment to the Share Exchange
Agreement and shall become effective upon the execution by Parent, Acquireco and
Company as required by Section 10.11 of the Share Exchange Agreement. Except as
expressly amended pursuant to this Amendment, the Share Exchange Agreement shall
continue in full force and effect. This Amendment shall not constitute a waiver
of any of Parent's rights under the Share Exchange Agreement, including, without
limitation, any waiver of Parent's conditions to close under the Share Exchange
Agreement or any rights relating to breaches of representations, warranties,


                                       6
<PAGE>

covenants or obligations, if any, by Company prior to the date hereof, or any
other rights related thereto.

      18. THIS AMENDMENT SHALL BE GOVERNED BY, AND CONSTRUED AND ENFORCED IN
ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK OTHER THAN CONFLICT OF LAWS
PRINCIPLES THEREOF DIRECTING THE APPLICATION OF ANY LAW OTHER THAN THAT OF NEW
YORK.

      19. Each party agrees to fulfill in good faith its obligations under the
Share Exchange Agreement, including without limitation this Amendment.

      20. This Amendment may be executed and delivered (including by facsimile
transmission) in one or more counterparts, and by the different parties hereto
in separate counterparts, each of which when executed and delivered shall be
deemed to be an original but all of which taken together shall constitute one
and the same agreement.


                                       7
<PAGE>


      IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
executed as of the date first written above by their respective officers
thereunto duly authorized.

                                    BAXTER INTERNATIONAL INC.


                                    By: /s/ Timothy B. Anderson
                                        -----------------------------------
                                          Name:  Timothy B. Anderson
                                          Title: Group Vice President,
                                                 Corporate Strategy and
                                                  Development


                                    NORTH AMERICAN VACCINE, INC.


                                    By:  /s/ Randal Chase
                                        -----------------------------------
                                          Name:  Randal Chase
                                          Title: President and Chief Executive
                                                   Officer


                                    NEPTUNE ACQUISITION CORP.


                                    By: /s/ Freidrich Dorner
                                        -----------------------------------
                                          Name:  Dr. Freidrich Dorner
                                          Title: President












                                       8

<PAGE>

                                    Exhibit A


                ASSIGNMENT, ACCEPTANCE AND AMENDMENT AGREEMENT
                              DATED APRIL 17, 2000

            Reference is made to the letter loan agreement dated as of November
1, 1999 (as amended, renewed, extended, amended and restated, supplemented or
otherwise modified from time to time, the "CREDIT AGREEMENT"; the terms defined
therein, unless otherwise defined herein, being used herein as therein defined)
between North American Vaccine, Inc., a Canadian corporation (the "BORROWER"),
and Bank of America, N.A. (the "ORIGINAL LENDER").

            WHEREAS, the Original Lender wishes to sell and assign all of its
rights and obligations under the Loan Documents to BioChem Pharma Inc., a
Canadian corporation (the "NEW LENDER"), and the Borrower wishes to consent to
such sale and assignment upon the terms set out herein; and

            WHEREAS, upon such sale and assignment, the Original Lender will
release the Guaranty and the Guarantor will release the Reimbursement Agreement
on the terms set out herein.

            NOW, THEREFORE, in consideration of the foregoing, and other good
and valuable consideration, the receipt and adequacy of which are hereby
acknowledged, and intending to be legally bound hereby, the parties hereto
agree, with effect from the Effective Date (as defined in Section 1), as
follows:

            1. Upon receipt of the Payoff Amount (as defined below) by the
Original Lender in immediately available funds delivered in accordance with
wiring instructions delivered by the Original Lender to the New Lender (or its
representatives), the Original Lender hereby agrees to sell and assign, without
recourse and without representation or warranty (except as to the
representations and warranties expressly made by Original Lender in paragraph 2
below) to the New Lender, and the New Lender hereby agrees to purchase and
assume from the Original Lender, all of the Original Lender's rights and
obligations under the Credit Agreement and the other Loan Documents. The
Borrower hereby consents to such sale and assignment from the Original Lender to
the New Lender. This Agreement shall become effective on April 17, 2000 (the
"EFFECTIVE DATE"). The aggregate amount owed to the Original Lender with respect
to the Loans (inclusive of principal, interest, commitment fees, other fees,
expense reimbursements and all other amounts owed to the Original Lender in
respect to such indebtedness) through and including the Effective Date is
US$19,549,190.40 (the "PAYOFF AMOUNT"). In the event that the Payoff Amount is
not received on or prior to 4:00 p.m. (Charlotte, North Carolina time) on April
17, 2000, the Loans will continue to accrue interest (at the Base Rate plus 2%)
at a per diem amount of US$5933.58 for each day after April 17, 2000 that the
Original Lender has not received payment in full prior to 4:00 p.m (Charlotte,
North Carolina time) in immediately available funds in accordance with the
wiring instructions delivered by the Original Lender. After giving effect to

<PAGE>

such sale and assignment, the amount of the Loans owing to the New Lender will
be US$19,549,190.40.

            2. The Original Lender (i) represents and warrants that it is the
legal and beneficial owner of the interest or interests being assigned by it
hereunder; (ii) makes no representation or warranty and assumes no
responsibility with respect to any statements, warranties or representations
made in or in connection with any Loan Document or the execution, legality,
validity, enforceability, genuineness, sufficiency or value of, or the
perfection or priority of any lien or security interest created or purported to
be created under or in connection with, any Loan Document or any other
instrument or document furnished pursuant thereto; and (iii) makes no
representation or warranty and assumes no responsibility with respect to the
financial condition of the Borrower or the performance or observance by the
Borrower of any of its obligations under any Loan Document or any other
instrument or document furnished pursuant thereto.

            3. The New Lender (i) confirms that it has received a copy of the
Credit Agreement, together with such other documents and information as it has
deemed appropriate to make its own credit analysis and decision to enter into
this Agreement; (ii) agrees that it will, independently and without reliance
upon the Original Lender and based on such documents and information as it shall
deem appropriate at the time, continue to make its own credit decisions in
taking or not taking action under the Credit Agreement; and (iii) agrees that it
will perform in accordance with their terms all of the obligations that by the
terms of the Credit Agreement and the other Loan Documents are required to be
performed by it as the Lender.

            4. (i) The New Lender shall be a party to the Credit Agreement and
the other Loan Documents and, to the extent provided in this Agreement, have the
rights and obligations of the Lender thereunder and (ii) the Original Lender
shall, to the extent provided in this Agreement, relinquish its rights and be
released from its obligations under the Credit Agreement and the other Loan
Documents (other than its rights under the Loan Documents that are specified
under the terms of such Loan Documents to survive the payment in full of the
obligations of the Borrower under the Loan Documents to the extent any claim
thereunder relates to an event arising prior to the Effective Date) and the
Original Lender shall cease to be a party thereto.

            5. From and after the Effective Date, the Borrower shall make all
payments under the Credit Agreement in respect of the interest assigned hereby
(including, without limitation, all payments of principal, interest and
commitment fees with respect thereto) to the New Lender. The Original Lender and
the New Lender shall make all appropriate adjustments in payments under the
Credit Agreement for periods prior to the Effective Date.

            6. On the Effective Date, without any action on the part of the
Guarantor or the Borrower, (i) the Guaranty will be terminated and the Guarantor
unconditionally and irrevocably released, and (ii) the Reimbursement Agreement,
the Security Agreement dated November 1, 1999 between the Guarantor and the
Borrower and the Patent and Trademark Assignment and Security Agreement, dated
November 1, 1999 between the Guarantor and the Borrower will each be terminated


                                      -2-
<PAGE>

and the Borrower unconditionally and irrevocably released. The parties further
agree that the Guarantor is a party to this Agreement solely for the purposes of
this Section 6, and the Guarantor shall have no rights or liabilities under this
Agreement other than those set out in this Section 6 and Sections 12 and 13.

            7. Immediately following the sale and assignment under Sections 1 to
5, and the releases and terminations under Section 6, the New Lender, Dr.
Phillip Frost ("FROST") and the Borrower agree that the Credit Agreement shall
be assigned as set forth in Part I of Schedule A and amended as set forth in
Part II of Schedule A.

            8.    The Borrower represents and warrants to each of the New
Lender and Frost as follows:

            (1)   the representations and warranties contained in each Loan
                  Document are correct on and as of the date hereof, after
                  giving effect to this Agreement, as though made on and as of
                  the date hereof, other than any such representations or
                  warranties that by their terms, refer to a specific date, in
                  which case, as of such specific date; and

            (2)   no Default or Event of Default which has not been waived has
                  occurred and is continuing under the Credit Agreement, as
                  amended hereby, or would result from this Agreement or the
                  consummation of the transactions contemplated hereby.

            9.    Without prejudice to any Default or Event of Default
arising after the date hereof:

            (3)   with respect to any Default or Event of Default (other than
                  one under Section 5(k) of the Credit Agreement) which is
                  continuing, which event does not have a grace or cure period
                  and which event arose on or before the date hereof, the New
                  Lender and Frost hereby waive their respective rights under
                  the last paragraph of Section 5 of the Credit Agreement; and

            (4)   with respect to any Default or Event of Default (other than
                  one under Section 5(k) of the Credit Agreement) which is
                  continuing, which event has a grace or cure period and which
                  event arose on or before the date hereof, such grace or cure
                  period shall be deemed to commence on the date hereof.

            10.   (a)   Each reference in the Credit Agreement to "this
                        Agreement", "hereunder", "hereof" or words like
                        import referring to the Credit Agreement, and each
                        reference in each of the other Loan Documents to "the
                        Credit Agreement", "thereunder", "thereof" or words
                        of like import referring to the Credit Agreement,


                                      -3-
<PAGE>

                        shall mean and be a reference to the Credit
                        Agreement, as amended by this Agreement.

                  1     The Credit Agreement and each of the other Loan
                        Documents, as specifically amended by this Agreement,
                        are and shall continue to be in full force and effect
                        and are hereby in all respects ratified and confirmed.

                  (2)   The execution, delivery and effectiveness of this
                        Agreement shall not, except as expressly provided
                        herein, operate as a waiver of any right, power or
                        remedy by the New Lender under any of the Loan
                        Documents, nor constitute a waiver of any provision of
                        any of the Loan Documents.

                  (a)   This Agreement shall become effective on the Effective
                        Date; provided that the Effective Date shall be deemed
                        modified to be the actual date of the sale and
                        assignment to the extent the parties do not close on
                        April 17, 2000.

                  (b)   The Borrower agrees to pay on demand all costs and
                        expenses of the Original Lender and the New Lender in
                        connection with the preparation, execution, delivery
                        and administration, modification and amendment of
                        this Agreement and the other instruments and
                        documents to be delivered hereunder (including,
                        without limitation, the reasonable fees and expenses
                        of counsel for the Original Lender and the New
                        Lender) in accordance with the terms of Section 6(i)
                        of the Credit Agreement.  In addition, the Borrower
                        shall pay any and all stamp and other taxes payable
                        or determined to be payable in connection with the
                        execution and delivery of this Agreement and the
                        other instruments and documents to be delivered
                        hereunder, and agrees to hold the New Lender harmless
                        from and against any and all liabilities with respect
                        to or resulting from any delay in paying or omission
                        to pay such taxes.

                  (c)   This Agreement shall be governed by, and construed in
                        accordance with, the laws of the State of New York.

                  (d)   This Agreement may be executed in any number of
                        counterparts and by different parties hereto in
                        separate counterparts, each of which when so executed
                        shall be deemed to be an original and all of which
                        taken together shall constitute one and the same
                        agreement.  Delivery of an executed counterpart of
                        this Agreement by telecopier shall be effective as
                        delivery of an original executed counterpart of this
                        Agreement.




                                      -4-
<PAGE>

            IN WITNESS WHEREOF, the parties hereto have caused this Agreement to
be executed by their duly authorized officers.

                                    THE ORIGINAL LENDER

                                    BANK OF AMERICA, N.A. as Original Lender

                                    By:
                                        --------------------------------------
                                          Title:
                                          Date:


                                    THE NEW LENDER

                                    BIOCHEM PHARMA INC. as New Lender

                                    By:
                                        --------------------------------------
                                          Title:
                                          Date:


                                    By:
                                        --------------------------------------
                                          Title:
                                          Date:


                                    THE BORROWER

                                    NORTH AMERICAN VACCINE, INC. as Borrower

                                    By:
                                        --------------------------------------
                                          Title:
                                          Date:




                                      -5-
<PAGE>


                                    THE GUARANTOR

                                    BAXTER INTERNATIONAL INC. as Guarantor

                                    By:
                                        --------------------------------------
                                          Title:
                                          Date:


                                    FROST

                                    ----------------------------------------
                                          Dr. Phillip Frost
                                          Date:




                                      -6-
<PAGE>




                                   SCHEDULE A
                                     PART I

                         ASSIGNMENT OF CREDIT AGREEMENT

            1. In consideration of the sum of US$1 paid by Frost to the New
Lender (the receipt and sufficiency of which is hereby acknowledged), the New
Lender hereby sells and assigns, without recourse except as to the
representations and warranties made by it herein, to Frost, and Frost hereby
purchases and assumes from the New Lender, an interest in and to the New
Lender's rights and obligations under the Credit Agreement as of the date hereof
as specified below:

            Amount of Commitment Assigned:      $5,000,000
            Amount of Loans Assigned:           $0

After giving effect to such sale and assignment, the amount of the Loans owing
to the New Lender will be US$19,549,190.40.

            2. The New Lender (i) represents and warrants that it is the legal
and beneficial owner of the interest or interests being assigned by it under the
Assignment, Acceptance and Amendment Agreement dated April 17, 2000 and that
such interest or interests are free and clear of any adverse claim; (ii) makes
no representation or warranty and assumes no responsibility with respect to any
statements, warranties or representations made in or in connection with any Loan
Document or the execution, legality, validity, enforceability, genuineness,
sufficiency or value of, or the perfection or priority of any lien or security
interest created or purported to be created under or in connection with, any
Loan Document or any other instrument or document furnished pursuant thereto;
and (iii) makes no representation or warranty and assumes no responsibility with
respect to the financial condition of the Borrower or the performance or
observance by the Borrower of any of its obligations under any Loan Document or
any other instrument or document furnished pursuant thereto.

            3. Frost (i) confirms that he has received a copy of the Credit
Agreement, together with such other documents and information as he has deemed
appropriate to make his own credit analysis and decision to enter into this
Agreement; (ii) agrees that he will, independently and without reliance upon the
New Lender and based on such documents and information as he shall deem
appropriate at the time, continue to make his own credit decisions in taking or
not taking action under the Credit Agreement; and (iii) agrees that he will
perform in accordance with their terms all of the obligations that by the terms
of the Credit Agreement are required to be performed by him as the Lender to the
extent of the obligations assumed by him under this Agreement.

            4. (i) Frost shall be a party to the Credit Agreement and, to the
extent provided in this Agreement, have the rights and obligations of the Lender
thereunder and (ii) the New Lender shall, to the extent provided in this


                                      A-1
<PAGE>

Agreement, relinquish its rights and be released from its obligations under the
Credit Agreement (other than its rights and obligations under the Loan Documents
that are specified under the terms of such Loan Documents to survive the payment
in full of the obligations of the Borrower under the Loan Documents to the
extent any claim thereunder relates to an event arising prior to the Effective
Date).

            5. The Borrower shall make all payments under the Credit Agreement
in respect of the interest assigned hereby (including, without limitation, all
payments of principal, interest and commitment fees with respect thereto) to
Frost.

            6. It is the intention of the New Lender, the Borrower and Frost
that Frost shall not have any right or interest in or to any of the Security
Agreement, the IP Security Agreement and the Pledge Agreement (the "SECURITY
DOCUMENTS"). The New Lender agrees with Frost that, to the extent the New Lender
receives or realizes any proceeds under or in respect of the Security Documents
or the collateral covered thereby or subject thereto, the New Lender shall,
after deduction of all reasonable costs and expenses incurred by the New Lender
in the realization of such proceeds, pay to Frost an amount equal to Frost's
Share of such net proceeds. For the purpose of this paragraph, "FROST'S SHARE"
shall mean the result (expressed as a percentage) of dividing the aggregate
outstanding principal amount of Loans made by Frost by the aggregate outstanding
principal amount of all Loans made by the New Lender and Frost, in each case
calculated on the date of receipt of such proceeds by the New Lender. New Lender
covenants and agrees for the benefit of Frost that, upon the occurrence and
during the continuance of an Event of Default under the Credit Agreement, it
will take all commercially reasonable action to enforce the Lender's rights
thereunder.












                                      A-2
<PAGE>


                                   SCHEDULE A
                                     PART II

                         AMENDMENTS TO CREDIT AGREEMENT

      3.    In the first paragraph, the words "BANK OF AMERICA, N.A. ("LENDER")
            is" shall be deleted and replaced with the words "BIOCHEM PHARMA
            INC. ("LENDER") and DR. PHILLIP FROST ("FROST") are"

      4.    Section 1(a) (other than the heading) shall be deleted in its
            entirety and replaced with the words:

            "Subject to the terms and conditions set forth herein, Lender and
            Frost, on a several (and not joint) basis, agree to make available
            to Borrower until the Maturity Date a revolving line of credit
            providing for loans ("LOANS") in an aggregate principal amount not
            exceeding at any time US$45,000,000; PROVIDED, HOWEVER, Lender shall
            not be obligated to make Loans in an aggregate principal amount
            exceeding US$40,000,000 (the "BIOCHEM COMMITMENT") and Frost shall
            not be obligated to make Loans in an aggregate principal amount
            exceeding US$5,000,000 (the "FROST COMMITMENT", and together with
            the BioChem Commitment, the "COMMITMENTS" and each a "COMMITMENT ")
            and PROVIDED FURTHER, HOWEVER, that Frost shall not, and shall not
            be obligated to, make any Loans hereunder until the BioChem
            Commitment has been drawn down in full by the Borrower and remains
            outstanding. Subject to the foregoing limits, Borrower may borrow,
            repay and reborrow Loans with until the Maturity Date.".

      5.    Section 1(b) (other than the heading) shall be deleted in its
            entirety and replaced with the words:

            "Borrower may request that Loans be made by irrevocable notice to be
            received by Lender or Frost (as the case may be) not later than
            11:00 a.m. on the third Business Day before the day of the proposed
            Loan, or such shorter period as Lender or Frost (as the case may be)
            may agree. Such request may not be made as more frequently than
            weekly, and shall be accompanied by details of the proposed use by
            Borrower of such Loan.".

      6.    The first two paragraphs of Section 1(c) (other than the heading)
            shall be deleted in their entirety and replaced with the words:

            "Interest on the unpaid principal amount of each Loan shall accrue
            monthly from the date of the making thereof until the principal
            amount thereof shall be repaid in full at a rate of 15% per annum
            and shall be payable monthly in arrears and on the repayment or
            maturity of each Loan, by acceleration or otherwise.".



                                      A-3
<PAGE>

      7.    In Section 1(c), in the third paragraph, the words "Base Rate" shall
            be deleted and replaced with the words "rate specified in the
            preceding paragraph".

      8.    In Section 1(c), in the fourth paragraph, after the word "Lender"
            the words "or Frost" shall be added.

      9.    In Section 1(d) the first sentence shall be deleted in its entirety
            and replaced with the words:

            "The Loans and all payments thereon shall be evidenced by Lender's
            and Frost's (as the case may be) loan accounts and records;
            PROVIDED, HOWEVER, that upon the request of Lender or Frost (as the
            case may be), the Loans of Lender or Frost (as the case may be) may
            be evidenced by grid promissory notes (each a "NOTE") in the form of
            EXHIBIT B hereto, instead of or in addition to such loan accounts
            and records.".

      10.   In Section 1(e), paragraphs (i) and (ii) shall be deleted in their
            entirety and replaced with the words:

            "(i)  BIOCHEM DEFERRED FUNDING FEE.  The Borrower shall pay to
            Lender a deferred funding fee of $10,000,000 on the Maturity Date.

            (ii) FROST DEFERRED FUNDING FEE. Providing at least one Loan has
            been made by Frost on or before the Maturity Date, the Borrower
            shall pay to Frost a non-assignable and non-transferrable deferred
            funding fee of $1,250,000 on the Maturity Date.

            (iii) FROST COMMITMENT FEE.  If no Loan has been made by Frost on
            or before the Maturity Date, the Borrower shall pay to Frost a
            commitment fee of $50,000 on the Maturity Date.".

      11.   In Section 1(f), the second paragraph shall be deleted in its
            entirety and replaced with the words:

            "Borrower shall make (i) all payments to Lender required hereunder
            not later than 1 p.m. on the date of payment in same day funds in
            United States Dollars to the bank of Lender located at Royal Bank of
            Canada, 3100 Le Carrefour Blvd, Laval, Quebec Canada, H7T 2K2,
            transit number: 02301, account number: 406-610-6 or such other bank
            or address as Lender may from time to time designate in writing and
            (ii) all payments to Frost required hereunder not later than 1 p.m.
            on the date of payment in same day funds in United States Dollars to
            the bank of Frost located at such bank or address as Frost may from
            time to time designate in writing.".



                                      A-4
<PAGE>

      12.   In Section 1(f):

            (1)   in the third paragraph, each occurrence of the word "Lender"
                  shall be deleted and replaced with the words "Lender or Frost
                  (as the case may be)"; and

            (2)   in line fourteen, after the words "is organized" the words "or
                  resident" shall be added.

      13.   Section 1(g) shall be deleted in its entirety and replaced with the
            words:

            "PREPAYMENTS. Borrower may, upon same-day notice, prepay the Loans
            on any Business Day. Prepayments must be accompanied by a payment of
            interest on the amount so prepaid. Prepayments must be in a
            principal amount of at least $500,000 or a multiple of $100,000 in
            excess thereof. If any prepayment is made at a time when Loans from
            Lender and Frost are outstanding, such prepayment of principal and
            interest shall be paid to Lender and Frost pro rata to the aggregate
            outstanding amount of their respective Loans".

      14.   In Section 2(c), paragraph (i), the words "and Guarantor" shall be
            deleted and replaced with the words "or Frost".

      15.   In Section 3, in the first line, after the word "Lender" the words
            "and Frost" shall be added.

      16.   In Section 3(f):

            (1)   in the first line, the word "solely" shall be deleted; and

            (2)   in the second line, after the word "Borrower" the words "or
                  for such other purposes as Lender or Frost (as the case may
                  be) may approve" shall be added.

      17.   In Section 3(j), in the first line, after the word "Lender" the
            words "or Frost" shall be added.

      18.   In Section 3(l) the words "and Guarantor" shall be deleted.

      19.   In Section 4(a), in the first line, after the word "Lender" the
            words "and, if Frost shall so request, to Frost" shall be added.

      20.   Section 4(b)(ii) shall be deleted in its entirety and replaced with
            the words:



                                      A-5
<PAGE>

            "(ii) comply with all applicable laws, rules, regulations and
                  orders, such compliance to include, without limitation,
                  compliance with ERISA, the Racketeer Influenced and Corrupt
                  Organizations Chapter of the Organized Crime Control Act of
                  1970, Environmental Laws and Environmental Permits, in each
                  case the violation of which could result in a Material Adverse
                  Effect.".

      21.   In Section 4(b)(v) after the word "Lender" the words "and Frost"
            shall be added.

      22.   In Section 4(b)(vi):

            (1)   in the first line, the words "and (B)" shall be deleted and
                  replaced with the words ", (B) all of its stock and other
                  collateral subject to the Pledge Agreement and (C);

            (2)   in the fourth line, after the word "Lender" the words "and
                  Frost" shall be added;

            (3)   in the fifth line, after the words "IP Security Agreement" the
                  words ", the Pledge Agreement" shall be added; and

            (4)   in the last line, the word "and" shall be deleted.

      23.   In Section 4(b)(vii) the full stop at the end shall be deleted and
            replaced with the words "; and", and the following paragraphs shall
            be added:

            "(viii)  preserve and maintain its  existence  and legal  structure,
                     provided,  however,  that the Borrower and its Subsidiaries
                     may consummate any merger or consolidation  permitted under
                     Section 4(c) (iii); and

            (vix)    keep true  records  and books of account  in which  entries
                     will be made of all dealings or transactions in relation to
                     its  business  and  affairs in  accordance  with  generally
                     accepted accounting  principles,  to the extent applicable,
                     applied on a consistent basis.".

      24.   In Section 4(c)(i) the full stop at the end shall be deleted and
            replaced with the words " and (C) Indebtedness in an aggregate
            amount of up to $5,000,000 provided such Indebtedness is
            subordinated to the Indebtedness under the Loan Documents in a
            manner reasonably satisfactory to Lender and Frost".

      25.   In Section 4(c), paragraph (iii), the words "(other than Guarantor
            or any Affiliate Guarantor)" shall be deleted.

      26.   After Section 4(c)(xii) the following paragraphs shall be added:



                                      A-6
<PAGE>

            "(xiii)  ORGANIZATIONAL   DOCUMENTS.   Amend,  modify,   restate  or
                     supplement its  Certificate of  Incorporation  or Bylaws if
                     such action  could  reasonably  be  expected  to  adversely
                     affect the rights of the Lender under the Credit Agreement,
                     the IP  Security  Agreement,  the Pledge  Agreement  or the
                     Security Agreement.

            (xiv)    SUBSIDIARIES.  Form,  create or acquire any  Subsidiary  or
                     permit any Person other than the Borrower or a wholly owned
                     Subsidiary  to hold an equity  interest in any  Subsidiary,
                     other than pursuant to the Pledge Agreement.

            (xv)     PARTNERSHIPS,  ETC. Become a general partner in any general
                     or  limited  partnership  or joint  venture  other than any
                     Subsidiary the sole assets of which consist of its interest
                     in such partnership or joint venture."

      27.   In Section 5(g) after each occurrence of the word "Lender" the words
            "and Frost" shall be added.

      28.   Section 5(h) shall be deleted in its entirety and replaced with the
            words "Intentionally Omitted".

      29.   In Section 5(m) after the words "any party thereto" the words "or
            terminated automatically in accordance with its terms; PROVIDED,
            HOWEVER, that (i) if the date by when the Effective Time (as defined
            in the North American Vaccine Acquisition Agreement) shall have
            occurred has been extended pursuant to Section 9.01(b) of the North
            American Vaccine Acquisition Agreement, it shall not be an Event of
            Default under this Section 5(m) until such extended date; or (ii) in
            any other circumstance, it shall not be an Event of Default under
            this Section 5(m) until 15 calendar days have elapsed" shall be
            added.

      30.   In Section 5(o) the full stop at the end shall be deleted and
            replaced with the words "; or", and the following paragraph shall be
            added:

            "(p)  Rejection by UK authorities of NeisVac-C(TM)application.".

      31.   In the last paragraph of Section 5:

            (1)   the words "Upon the occurrence of an Event of Default, Lender
                  may declare the Commitment to be terminated, whereupon the
                  Commitment shall be terminated," shall be deleted and replaced
                  with the words:

                  "Upon the occurrence of an Event of Default, which Event of
                  Default (other than any of the events specified in Sections
                  5(i),(j) or (m) above)) has not been cured within 10 calendar


                                      A-7
<PAGE>

                  days thereof, Lender or Frost may declare its or his
                  respective Commitment to be terminated, whereupon such
                  Commitment shall be terminated,"; and

            (2)   in line eight, the word "Commitment" shall be deleted and
                  replaced with the word "Commitments".

      32.   In Section 6(b) the words "Charlotte, North Carolina" shall be
            deleted and replaced with the words "Quebec, Canada".

      33.   Sections 6(c) and (d) shall be deleted in their entirety and
            replaced with the words "Intentionally Omitted".

      34.   In Section 6(f):

            (1)   in the second line, after the word "Lender" the words "or
                  Frost (as the case may be)" shall be added;

            (2)   in the fourth line, after the word "Lender" the words "and
                  Frost" shall be added; and

            (3)   in the second line, after the word "Lender" the words "or
                  Frost (as the case may be)" shall be added.

      35.   In Section 6(h):

            (1)   in the third line, after the word "LENDER" the words "OR FROST
                  (AS THE CASE MAY BE)" shall be added;

            (2)   in the ninth line, the words "(B) GUARANTOR OR (C)" shall be
                  deleted and replaced with the words "OR (B)"; and

            (3)   the final two sentences shall be deleted and replaced with the
                  words:

                  "Borrower agrees to execute any documents reasonably requested
                  by Lender or Frost (as the case may be) in connection with any
                  such assignment. All information provided by or on behalf of
                  Borrower to Lender or its affiliates or Frost may be furnished
                  by Lender or Frost to Lender's affiliates and to any actual or
                  proposed assignee or participant.".

      36.   In Section 6(i) after each occurrence of the word "Lender" the words
            "or Frost (as the case may be)" shall be added.



                                      A-8
<PAGE>

      37.   In Section 6(m) the word "AND LENDER" shall be deleted and replaced
            with the words ", LENDER AND FROST" shall be added.

      38.   In Exhibit A, the following definitions shall be deleted:

            Base Rate
            Base Rate Loan
            Breakage Costs
            Federal Funds Rate

            Guaranty Event of Default
            Guaranty Obligation
            Interest Period
            Loan Documents
            Maturity Date
            Offshore Rate
            Offshore Rate Loan;

            and the following definitions shall be added:

            Environmental Law:      Any Federal, state, local or foreign
                                    statute, law, ordinance, rule,
                                    regulation, code, order, writ, judgment,
                                    injunction or decree or any judicial or
                                    agency interpretation, policy or guidance
                                    (in the case of the latter, only to the
                                    extent compliance is legally compulsory)
                                    relating to pollution or protection of
                                    the environment, health, safety or
                                    natural resources, including, without
                                    limitation, those relating to the use,
                                    handling, transportation, treatment,
                                    storage, disposal, release or discharge
                                    of Hazardous Materials.

            Environmental Permit:   Any permit, approval, identification
                                    number, license or other authorization
                                    required under any Environmental Law.

            Hazardous Materials:    (a) Petroleum or petroleum products,
                                    by-products or breakdown products,
                                    radioactive materials,
                                    asbestos-containing materials,
                                    polychlorinated biphenyls and radon gas
                                    and (b) any other chemical, materials or
                                    substances designated, classified or
                                    regulated as hazardous or toxic or as a
                                    pollutant or contaminant under any
                                    Environmental Law.

            Loan Documents:         This Agreement, the Security Agreement,
                                    the IP Security Agreement, the Pledge
                                    Agreement and any promissory note,


                                      A-9
<PAGE>

                                    certificate, fee letter, financing
                                    statement and other instrument, document
                                    or agreement delivered in connection with
                                    this Agreement or the Security Agreement
                                    or the IP Security Agreement or the
                                    Pledge Agreement.

            Maturity Date:          June 30, 2000, or such earlier date on
                                    which the Commitments may terminate in
                                    accordance with the terms hereof,
                                    provided, HOWEVER, that (i) if the date
                                    by when the Effective Time (as defined in
                                    the North American Vaccine Acquisition
                                    Agreement) shall have occurred has been
                                    extended pursuant to Section 9.01(b) of
                                    the North American Vaccine Acquisition
                                    Agreement to a date after June 30, 2000,
                                    the Maturity Date shall be deemed to be
                                    extended to such later date, or (ii) if a
                                    Default under Section 5(m) has occurred
                                    and the grace period under such Section
                                    has not expired on or before June 30,
                                    2000, the Maturity Date shall be deemed
                                    to be extended to the end of such grace
                                    period.

            Pledge Agreement:       The Pledge Agreement, if any, between the
                                    Borrower and Lender with respect to
                                    certain stock of Borrower and its
                                    Subsidiaries.

      39.   In Exhibit A, in the definition of Business Day:

            (1)   the words "State of North Carolina" shall be deleted and
                  replaced with the words "Quebec, Canada"; and

            (2)   the words "and, if such day relates to any Offshore Rate Loan,
                  means any such day on which dealings in dollar deposits are
                  conducted by and between banks in the offshore dollar
                  interbank market" shall be deleted.

      40.   In Exhibit A, in the definition of Change of Control, the full stop
            at the end shall be deleted and replace with the words "or (d) upon
            the completion of the North American Vaccine Acquisition."

      41.   In Exhibit A, in the definition of North American Vaccine
            Acquisition Agreement, the words "Agreement and Plan of Merger to
            be" shall be deleted and replaced with the words "Share Exchange
            Agreement dated as of November 17, 1999, as amended by Amendment No.
            1 to Share Exchange Agreement dated as of April 17, 2000".



                                      A-10
<PAGE>

      42.   In Exhibit A, in the definition of Principal Shareholder, the words
            "Guarantor," shall be deleted.

      43.   Exhibit B shall be deleted in its entirety and replaced with the
            attached Exhibit.

*
































                                      A-11

<PAGE>


                                          EXHIBIT TO SCHEDULE A TO ASSIGNMENT,
                                            ACCEPTANCE AND AMENDMENT AGREEMENT

                             FORM OF PROMISSORY NOTE

$[40][5],000,000                                         Dated: April __, 2000

            FOR VALUE RECEIVED, the undersigned, NORTH AMERICAN VACCINE, INC., a
Canadian corporation ("BORROWER"), hereby promises to pay to the order of
[BIOCHEM PHARMA INC. ("LENDER")] [DR. PHILLIP FROST ("FROST")] the principal sum
of [FORTY] [FIVE] Million Dollars (US$ [40] [5],000,000) or, if less, the
aggregate unpaid principal amount of all Loans made by [LENDER] [FROST] to
Borrower pursuant to the letter agreement dated as of November 1, 1999 between
Borrower and Bank of America, N.A.("BOA"), as assigned and amended pursuant to
the assignment, acceptance and amendment agreement dated April ___, 2000 between
Borrower, Lender, Frost, BoA and Baxter International Inc. (as so assigned and
amended, and as it may be otherwise amended, restated, extended, supplemented or
otherwise modified from time to time, the "AGREEMENT") on the Maturity Date.

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

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

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

                                          NORTH AMERICAN VACCINE, INC.


                                          By:   ___________________________
                                                Name:
                                                Title:



                                      A-12
<PAGE>

<TABLE>
<CAPTION>

                                 ADVANCES AND PAYMENTS OF PRINCIPAL
=============================================================================================================

                                            AMOUNT OF                UNPAID
                           AMOUNT OF      PRINCIPAL PAID            PRINCIPAL         NOTATION
         DATE               LOAN            OR PREPAID               BALANCE           MADE BY
<S>                        <C>            <C>                       <C>               <C>
- -------------------------------------------------------------------------------------------------------------

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

                                                    A-13
</TABLE>
<PAGE>

                                    Exhibit B


                               AMENDMENT NO. 1 TO

                              SHAREHOLDER AGREEMENT

           Amendment No. 1 dated as of April 17, 2000 (this "AMENDMENT") to the
Shareholder Agreement dated as of November 17, 1999 (the "SHAREHOLDER
AGREEMENT") among Baxter International Inc., a Delaware corporation ("PARENT"),
and the undersigned shareholders (each, a "SHAREHOLDER") of North American
Vaccine, Inc., a corporation existing under the federal laws of Canada
("COMPANY").

                                    RECITALS

           WHEREAS, Parent and the Shareholders desire to amend the Shareholder
Agreement as set forth in this Amendment;

           WHEREAS, concurrently with the execution of this Amendment, Parent,
Company and Neptune Acquisition Corp., an unlimited liability company existing
under the laws of the Province of Nova Scotia and a wholly owned subsidiary of
Parent ("ACQUIRECO"), have entered into Amendment No. 1 to the Share Exchange
Agreement dated as of November 17, 1999 among Parent, Acquireco and Company;

           NOW, THEREFORE, in consideration of the foregoing, and other good and
valuable   consideration,   the  receipt  and   adequacy  of  which  are  hereby
acknowledged,  and  intending to be legally  bound  hereby,  the parties  hereto
hereby agree as follows:

           1.     The first recital of the Shareholder Agreement is hereby
amended and restated in its entirety to read as follows:

           "WHEREAS, pursuant to a Share Exchange Agreement dated as of November
17, 1999 by and among Parent,  Neptune Acquisition Corp., an unlimited liability
company  existing  under the laws of the  Province  of Nova  Scotia and a wholly
owned subsidiary of Parent  ("ACQUIRECO")  and Company,  as amended by Amendment
No. 1 dated as of April 17, 2000 (such agreement,  as so amended, is hereinafter
referred to as the "SHARE  EXCHANGE  AGREEMENT"),  Parent has agreed to exchange
the  outstanding  securities of Company  pursuant to an exchange by Acquireco of
all of the  capital  stock of the  Company  (the  "ARRANGEMENT"),  in which each
outstanding  share of capital  stock of Company (the  "COMPANY  SHARES") will be
exchanged for cash and shares of common stock of Parent (the "PARENT SHARES") as
set forth in the Share Exchange Agreement (the "TRANSACTION");"

           2.     This Amendment shall be deemed an amendment to the Shareholder
Agreement and shall become effective when executed by Parent and the
Shareholders as required by Section 10 of the Shareholder Agreement. Except as

<PAGE>

expressly amended pursuant to this Amendment, the Shareholder Agreement shall
continue in full force and effect.

           3.     This Amendment shall be governed by, construed and enforced in
accordance with the internal laws of the State of New York without giving effect
to the principles of conflicts of law thereof.

           4.     This Amendment may be executed in several counterparts, each
of which shall be an original, but all of which together shall constitute one
and the same agreement.


           IN WITNESS WHEREOF,  the parties hereto have caused this Amendment to
be  executed as of the date first  written  above by their  respective  officers
thereunto duly authorized.





                                               BAXTER INTERNATIONAL INC.




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



                                               BIOCHEM PHARMA INC.




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



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




                                               FROST-NEVADA LIMITED PARTNERSHIP




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







<PAGE>


                                          SHAREHOLDER

                                          ----------------------------------
                                          (Signature)





                                          ----------------------------------
                                          (Signature of Spouse)


                                          ----------------------------------
                                          (Print Name of Shareholder)


                                          ----------------------------------
                                          (Print Street Address)


                                          ----------------------------------
                                          (Print City, State and Zip)


                                          ----------------------------------
                                          (Print Telephone Number)


                                          ----------------------------------
                                          (Social Security or Tax I.D. Number)





                                          IVAX CORPORATION


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



<PAGE>

                                    Exhibit C


                               AMENDMENT NO. 1 TO

                         TECHNICAL ASSISTANCE AGREEMENT

           Amendment No. 1 dated as of April 17, 2000 (this "AMENDMENT") to the
Technical Assistance Agreement dated as of February 4, 2000 (the "TECHNICAL
ASSISTANCE AGREEMENT") between Baxter International Inc., a Delaware corporation
("BAXTER"), and North American Vaccine Inc., a corporation existing under the
federal laws of Canada ("NAVA").

                                    RECITALS

           WHEREAS, Baxter and NAVA desire to amend the Technical Assistance
Agreement as set forth in this Amendment;

           WHEREAS, concurrently with the execution of this Amendment, Baxter,
NAVA and Neptune Acquisition Corp., an unlimited liability company existing
under the laws of the Province of Nova Scotia and a wholly owned subsidiary of
Baxter ("ACQUIRECO"), have entered into Amendment No. 1 to the Share Exchange
Agreement dated as of November 17, 1999 among Baxter, Acquireco and NAVA;

           NOW, THEREFORE, in consideration of the foregoing, and
other good and valuable consideration, the receipt and adequacy of which are
hereby acknowledged, and intending to be legally bound hereby, the parties
hereto hereby agree as follows:

           1.    The first recital of the Technical Assistance Agreement is
hereby amended and restated in its entirety to read as follows:

                  "WHEREAS, Baxter, NAVA and a wholly owned subsidiary of Baxter
           have entered into a Share Exchange Agreement, dated as of November
           17, 1999, as amended by Amendment No. 1 dated April 17, 2000 (such
           agreement, as so amended, is hereinafter referred to as the "SHARE
           EXCHANGE AGREEMENT"), pursuant to which the parties have agreed to
           enter into an arrangement which will result in NAVA becoming a wholly
           owned subsidiary of Baxter; and"

           2.     Schedule 1.01 to the Technical Assistance Agreement is hereby
amended to include the following at the end of such schedule:

                  "Notwithstanding the foregoing, it is understood and agreed by
           Baxter and NAVA that Baxter may, at its option but upon request of
           NAVA, provide the services of such number of individuals as
           reasonably determined by Baxter for the purpose of providing
           consulting services to NAVA with respect to any and all aspects of
           NAVA's business. Such individuals shall have complete, unrestricted



<PAGE>
           access to NAVA's  operations,  premises  and  personnel  at all times
           during the term of this Agreement."

           3.     This Amendment shall be deemed an amendment to the Technical
Assistance Agreement and shall become effective when executed by Baxter and NAVA
as required by Section 6.06 of the Technical Assistance Agreement. Except as
expressly amended pursuant to this Amendment, the Technical Assistance Agreement
shall continue in full force and effect.

           4.     This Amendment shall be governed by, construed and enforced in
accordance with the internal laws of the State of New York without giving effect
to the principles of conflicts of law thereof.

           5.     This Amendment may be executed in several counterparts, each
of which shall be an original, but all of which together shall constitute one
and the same agreement.

                  IN WITNESS  WHEREOF,  the  parties  hereto  have  caused  this
Amendment to be executed as of the date first written above by their  respective
officers thereunto duly authorized.



                                               BAXTER INTERNATIONAL INC.




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



                                               NORTH  AMERICAN VACCINE, INC.




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





                                       2




<PAGE>
                                    Exhibit D


April 17, 2000

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

Baxter International Inc.
One Baxter Parkway
Deerfield, Illinois 60015
Attention: General Counsel

Dear Sirs:

                  Reference is made to the Warrant No. W-1 dated July 21, 1999
of North American Vaccine, Inc. (the "COMPANY") registered in the name of
BioChem Pharma Inc. ("BCPI") for the purchase of 250,000 common shares, no par
value, of the Company (the "COMPANY SHARES"), Warrant No. W-2 dated August 26,
1999 of the Company registered in the name of BCPI for the purchase of 250,000
Company Shares and Warrant No. W-3 dated October 28, 1999 of the Company
registered in the name of BCPI for the purchase of 250,000 Company Shares
(collectively, the "WARRANTS").

                  In order to induce Baxter International Inc., a Delaware
corporation ("PARENT") to enter into the Share Exchange Agreement dated as of
November 17, 1999, as amended by Amendment No. 1 dated as of April 17, 2000
(such agreement, as so amended, is hereinafter referred to as the "SHARE
EXCHANGE AGREEMENT") among Parent, Neptune Acquisition Corp., an unlimited
liability company existing under the laws of the Province of Nova Scotia and a
wholly owned subsidiary of Parent, and Company, and in consideration of the
payment by Parent of the amount determined in accordance with Section 3.03(b) of
the Share Exchange Agreement, BCPI hereby agrees, subject to the consummation of
the transactions contemplated by the Share Exchange Agreement, as follows:

                  (i) the Warrants shall terminate and be of no further force or
effect as of the Effective Time (as defined in the Share Exchange Agreement)
without any further action on the part of Company or BCPI; and

                  (ii) BCPI hereby waives, effective as of the Effective Time,
any and all rights it has or may have under the Warrants, including, without
limitation, the right to receive shares of capital stock of Parent as a result
of the transactions contemplated by the Share Exchange Agreement.

                                BIOCHEM PHARMA INC.


                                By
                                   ------------------------------
                                Name: Dr. Francesco Bellini
                                Title: Chief Executive Officer

                                By
                                   ------------------------------
                                Name: Charles A. Tessier
                                Title: Vice President, Legal Affairs and General
                                Counsel


ACCEPTED AND AGREED as of the
date first written above:

NORTH AMERICAN VACCINE, INC.




By
  -------------------------------
    Name: Randall Chase, Ph.D
    Title: Chief Executive Officer & President


BAXTER INTERNATIONAL INC.




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




<PAGE>

                                    Exhibit E

                              AMENDED AND RESTATED
                      PLAN OF ARRANGEMENT UNDER SECTION 192

                     OF THE CANADA BUSINESS CORPORATIONS ACT

                                   ARTICLE 1

                                 INTERPRETATION

1.1      DEFINITIONS

         Unless indicated otherwise, where used in this Plan of Arrangement, the
following terms shall have the following meanings:

         "ACQUIRECO"  means Neptune  Acquisition  Corp,  an unlimited  liability
         company existing under the laws of the Province of Nova Scotia.

         "AGREEMENT" means the Share Exchange Agreement dated as of November 17.
         1999, as amended by Amendment  No. 1 dated as of April 17, 2000,  among
         Parent,  Company and  Acquireco  to which this Plan of  Arrangement  is
         attached as Annex A, and  includes  any annexes  attached  thereto,  as
         amended, modified or supplemented from time to time.

         "ARRANGEMENT"  means  the  arrangement  under  section  192 of the CBCA
         involving  Acquireco,  Company and the  shareholders  of Company on the
         terms and  conditions set out in this Plan of  Arrangement,  subject to
         any  amendments  thereto in accordance  with Section 5.4 or made at the
         direction of the Court in the Final Order.

         "ARRANGEMENT  RESOLUTION"  means the  resolution or  resolutions of the
         shareholders   approving  this  Plan  of  Arrangement  as  required  by
         applicable  law  and  the  Interim  Order,  substantially  in the  form
         attached to the Proxy Statement.

         "BUSINESS  DAY"  means any day on which the  principal  offices  of the
         United States  Securities and Exchange  Commission in Washington,  D.C.
         are open to accept filings,  or, in the case of determining a date when
         any  payment  is due,  any day on  which  banks  are  not  required  or
         authorized  by law or executive  order to close in the City of New York
         or the City of Toronto.

         "CBCA" means the Canada Business Corporations Act, as amended from time
         to time.

         "COMPANY"  means North American  Vaccine,  Inc. a corporation  existing
         under the CBCA.

         "COMPANY  COMMON  SHARES"  means the  common  shares,  no par value per
         share, of Company outstanding from time to time.

         "COMPANY  PREFERRED  SHARES"  means the  shares  of Series A  Preferred
         Stock,  no par value per  share,  of Company  outstanding  from time to
         time.

         "COMPANY SHARES" means Company Common Shares and the Company  Preferred
         Shares.

<PAGE>

         "COMPANY  SHAREHOLDERS'  MEETING"  means  the  special  meeting  of the
         shareholders  held  pursuant to Section 7.02 of the  Agreement  and any
         adjournment  or  postponement  thereof,  to  consider  and,  if thought
         advisable, to pass the Arrangement Resolution.

         "COURT"  means the  Ontario  Superior  Court of  Justice  or the Quebec
         Superior Court.

         "DEPOSITARY"  has the meaning  assigned  thereto in Section 1.01 of the
         Agreement.

         "DIRECTOR" means the Director appointed under section 260 of the CBCA.

         "DISSENT  PROCEDURES" has the meaning  assigned  thereto in Section 4.1
         hereof.

         "DISSENT  RIGHTS"  means the  rights of dissent  which each  Dissenting
         Shareholder  is entitled to exercise,  under the Interim  Order and the
         Final  Order and  strictly  in the manner set out in section 190 of the
         CBCA  and this  Plan of  Arrangement,  in  respect  of the  Arrangement
         Resolution.

         "DISSENTING  SHAREHOLDER"  means  a  shareholder  of  the  Company  who
         dissents from the Arrangement Resolution in compliance with the Dissent
         Procedures and the CBCA.

         "EFFECTIVE  DATE"  means the date upon which  this Plan of  Arrangement
         becomes  effective as established by the date of issue set forth in the
         certificate of arrangement  issued by the Director giving effect to the
         Arrangement.

         "EFFECTIVE   TIME"  means  the  time  of  filing  of  the  Articles  of
         Arrangement implementing the Arrangement.

         "FINAL ORDER" means the order of the Court made in connection  with the
         approval of the Arrangement  following the application  contemplated by
         Section 2.04 of the Agreement, as such order may be amended or modified
         by the highest court by which an appeal is heard prior to the Effective
         Time.

         "INTERIM ORDER" means the interim order of the Court made in connection
         with the approval of the Arrangement following the application therefor
         contemplated by Section 2.02 of the Agreement.

         "LETTERS OF TRANSMITTAL"  means the letters of transmittal to be mailed
         to  shareholders  of the  Company  by Company  together  with the Proxy
         Statement.

         "PARENT" means Baxter International Inc. a Delaware corporation.

         "PARENT COMMON STOCK" means the shares of common stock, par value $1.00
         per share, of Parent.

         "PROXY  STATEMENT" has the meaning  assigned thereto in Section 7.01 of
         the Agreement.

Terms used but not  otherwise  defined  herein shall have the meanings  assigned
thereto in the Arrangement Agreement.


                                       2
<PAGE>



1.2      INTERPRETATION NOT AFFECTED BY HEADINGS, ETC.

         The division of this Plan of Arrangement  into  articles,  sections and
other  portions and the insertion of headings are for  convenience  of reference
only and shall not affect the  construction  or  interpretation  of this Plan of
Arrangement.

1.3      CURRENCY.

         All sums of money which are referred to in this Plan of Arrangement are
expressed in lawful money of the United States unless otherwise specified.

1.4      NUMBER, ETC.

         Unless the  subject  matter or context  requires  the  contrary,  words
importing  the  singular  number  only shall  include the plural and vice versa,
words  importing  the use of any gender  shall  include  all  genders  and words
importing persons shall include natural persons, firms, trusts, partnerships and
corporations.

1.5      STATUTORY REFERENCES.

         Any  reference in this Plan of  Arrangement  to a statute  includes all
regulations made  thereunder,  all amendments to such statute in force from time
to time and any  statute or  regulation  that  supplements  or  supersedes  such
statute or regulation.

1.6      DATE OF ANY ACTION.

         In the event that any date on which any action is required or permitted
to be taken hereunder by any person is not a Business Day in the place where the
action is required or  permitted  to be taken,  such action shall be required or
permitted to be taken on the next succeeding day which is a Business Day in such
place.

                                   ARTICLE 2

                                   ARRANGEMENT

2.1      ARRANGEMENT

         This  Plan of  Arrangement  is made  pursuant  to,  is  subject  to the
provisions of and forms part of, the Agreement.

                                   ARTICLE 3

                                   ARRANGEMENT

3.1      EXCHANGE OF SHARES. At the Effective Time, the following shall be
deemed to occur in the order specified in the following paragraphs without any
further authorization, act or formality:

         (a)      Subject to Section 4.1,  each Company  Common Share issued and
                  outstanding  immediately  before the  Effective  Time shall be
                  exchanged by Acquireco for consideration consisting of:

                           (i) the fraction of a share  (calculated  and rounded
                  to the nearest  ten-thousandth  of one share) of Parent Common
                  Stock, (A) the numerator of which fraction shall be $6.70 (the


                                       3
<PAGE>


                  "SHARE CONSIDERATION"), and (B) the denominator of which shall
                  be the Parent  Stock Price (as defined in Section  3.1(a)(iii)
                  below); and

                           (ii) a cash payment of $.03 per Company  Common Share
                  (the  "CASH   CONSIDERATION"  and,  together  with  the  Share
                  Consideration, the "ARRANGEMENT CONSIDERATION");

                  PROVIDED,   HOWEVER,   that   in   the   event   the   Company
                  Capitalization  shall be  greater  or less than the amount set
                  forth in Section  4.03 of the  Agreement  by more than  10,000
                  Company  Common  Shares,  the  Share  Consideration  and  Cash
                  Consideration  shall each be adjusted by  multiplying  it by a
                  fraction, the numerator of which is the Company Capitalization
                  as set  forth  in  Section  4.03  of  the  Agreement  and  the
                  denominator of which is the actual Company  Capitalization  at
                  the Effective Time.

                           (iii)  For   purposes   of   calculating   the  Share
                  Consideration,  the "PARENT  STOCK  PRICE"  shall be an amount
                  equal to the average  closing  sale price of a share of Parent
                  Common Stock as reported in THE WALL STREET  JOURNAL under the
                  caption New York Stock Exchange Composite  Transactions or, if
                  not available,  such other authoritative publication as may be
                  reasonably selected by Parent, for the ten consecutive trading
                  days ending on and  including  the fifth  trading day prior to
                  the  Effective   Date.   In  the  event  Parent   changes  (or
                  establishes  a record date for  changing) the number shares of
                  Parent  Common  Stock  issued  and  outstanding  prior  to the
                  Effective Time as a result of a stock split,  stock  dividend,
                  distribution,       recapitalization,        reclassification,
                  reorganization  or  similar  transaction  with  respect to the
                  outstanding  Parent  Common Stock and the record date therefor
                  shall be prior to the Effective Time, the Share  Consideration
                  shall be  proportionately  adjusted  in such manner as Parent,
                  Acquireco and the Company shall agree,  which  adjustment  may
                  include, as appropriate, the issuance of securities,  property
                  or cash on the same basis as any of the  foregoing  shall have
                  been issued,  distributed  or paid to the holders of shares of
                  Parent Common Stock generally.

         (b)      Subject to Section 4.1,  each Company  Preferred  Share issued
                  and outstanding immediately before the Effective Time shall be
                  exchanged by Acquireco for consideration consisting of (i) the
                  number of shares of Parent  Common  Stock equal to the product
                  of (x) the number of  Company  Common  Shares  into which such
                  Company  Preferred Share is convertible  immediately  prior to
                  the Effective Time and (y) the Share Consideration  divided by
                  the Parent Stock Price,  and (ii) a cash payment  equal to the
                  product  of (x) the Cash  Consideration  and (y) the number of
                  Company Common Shares into which such Company  Preferred Share
                  is convertible immediately prior to the Effective Time.

         (c)      Each  shareholder of the Company shall cease to be a holder of
                  Company Common Shares or Company Preferred Shares, as the case
                  may be, and shall have his,  her or its name  removed from the
                  register  of  holders  of  Company  Common  Shares or  Company
                  Preferred Shares, as the case may be.

         (d)      All Company Common Shares and Company  Preferred  Shares shall
                  be held by Acquireco and the name of Acquireco  shall be added
                  to the  register  of  holders  of  Company  Common  Shares and
                  Company Preferred Shares.


                                       4
<PAGE>

         (e)      Certificates  formerly  representing Company Common Shares and
                  Company  Preferred  Shares shall  represent  only the right to
                  receive  the  consideration   therefor,   in  accordance  with
                  Articles 3, 4 and 5 hereof.

         (f)      Immediately  following the exchange of shares as  contemplated
                  by this  Section 3.1,  the Company  shall  increase the stated
                  capital of the Company Common Shares by an amount equal to the
                  difference  between  (i) the  product of the number of Company
                  Common   Shares   exchanged   pursuant  to  this  Section  3.1
                  multiplied  by  $6.73  and  (ii) the  product  of the  paid-up
                  capital of an issued and  outstanding  Company Common Share as
                  determined pursuant to the Income Tax Act (Canada) immediately
                  prior to the  increase  in  stated  capital  pursuant  to this
                  Section  3.1(g),  multiplied  by the number of Company  Common
                  Shares exchanged pursuant to this Section 3.1;

         (g)     Immediately  following the exchange of shares as  contemplated
                  by this  Section 3.1,  the Company  shall  increase the stated
                  capital of the  Company  Preferred  by an amount  equal to the
                  difference  between  (i) the  product of the number of Company
                  Preferred  Shares of the  Company  exchanged  pursuant to this
                  Section 3.1  multiplied by the number of Company Common Shares
                  into  which  each  Company   Preferred  Share  is  convertible
                  immediately  before the Effective Time multiplied by $6.73 and
                  (ii) the  product  of the  paid-up  capital  of an issued  and
                  outstanding  Company Preferred Share as determined pursuant to
                  the Income Tax Act (Canada)  immediately prior to the increase
                  in stated capital pursuant to this Section 3.1(g),  multiplied
                  by the number of Company  Preferred Shares exchanged  pursuant
                  to this Section 3.1.

3.2      NO  FRACTIONAL  SHARE  CERTIFICATES.  No scrip or  fractional  share of
Parent  Common Stock shall be issued upon the  surrender for exchange of Company
Shares, and an outstanding fractional share interest shall not entitle the owner
thereof to vote,  to receive  dividends  or to any  rights of a  stockholder  of
Parent with respect to such fractional share interest. As of the Effective Time,
Parent shall deposit with the  Depository an amount in cash  sufficient  for the
Depository  to pay each holder of Company  Shares an amount in cash,  rounded to
the nearest whole cent,  equal to the product  obtained by  multiplying  (i) the
fractional  share  interest to which such  holder  would  otherwise  be entitled
(after taking into account all Company Shares held at the Effective Time by such
holder) by (ii) the Parent Stock Price.

3.3      OPTIONS AND WARRANTS TO PURCHASE COMPANY COMMON SHARES.

         (a)  Immediately  prior to the  Effective  Time,  (i) the Company Stock
Options which are outstanding and unexercised immediately prior to the Effective
Time, shall be cancelled and (ii) in consideration of such cancellation,  Parent
shall pay to such  holders of Company  Stock  Options at the  Effective  Time an
amount in cash in respect  thereof  equal to the product of (x) the  excess,  if
any, of the  Arrangement  Consideration  (determined in accordance  with Section
3.1) over the exercise price thereof and (y) the number of Company Common Shares
subject  thereto (such payment to be net of taxes required by law to be withheld
with respect  thereto),  PROVIDED,  that the  foregoing  shall be subject to the
obtaining of any necessary consents of holders of Company Stock Options.

         (b) Company shall take all actions necessary so that, immediately prior
to the Effective Time and in accordance with the Warrant Termination Letter, (i)
the Company Warrants which are outstanding and unexercised  immediately prior to
the  Effective  Time  shall  be  cancelled  and  (ii) in  consideration  of such
cancellation,  Parent  shall pay to the  holder(s)  of Company  Warrants  at the
Effective Time an amount in respect thereof in Parent Common Stock valued at the


                                       5
<PAGE>

Parent  Stock Price  equal to the  product of (x) the excess of the  Arrangement
Consideration  (determined  in  accordance  with  Section 3.1) over the exercise
price thereof and (y) the number of Company Common Shares subject thereto.

3.4      CERTAIN  ADJUSTMENTS.  If prior to the Effective  Time,  Company Common
Shares or Company  Preferred  Shares shall be changed into a different number of
shares   by  reason  of  any   reclassification,   recapitalization,   split-up,
combination  or exchange of shares,  or any  dividend  payable in stock or other
securities shall be declared thereon with a record date within such period, then
the Arrangement  Consideration established pursuant to the provisions of Section
3.1(a)(i) or 3.1(b), as applicable,  shall be adjusted accordingly to provide to
Parent  and the  holders  of the  Company  Shares  the same  economic  effect as
contemplated hereby prior to such reclassification,  recapitalization, split-up,
combination, exchange, dividend or increase.

3.5      LOST, STOLEN OR DESTROYED  CERTIFICATES.  In the event any certificates
representing  Company  Shares  shall have been lost,  stolen or  destroyed,  the
Depository  shall  issue  in  exchange  for  such  lost,   stolen  or  destroyed
certificates,  upon  the  making  of an  affidavit  of that  fact by the  holder
thereof,  such  shares of Parent  Common  Stock (and cash in lieu of  fractional
shares) as may be required  pursuant to Section  3.1,  PROVIDED,  HOWEVER,  that
Parent  may, in its  discretion  and as a condition  precedent  to the  issuance
thereof,  require the owner of such lost,  stolen or destroyed  certificates  to
indemnify  Parent  against  any  claim  that may be made  against  Parent or the
Depository with respect to the certificates alleged to have been lost, stolen or
destroyed.

3.6      TAKING OF NECESSARY ACTION;  FURTHER ACTION.  If, at any time after the
Effective  Time,  any further  action is necessary or desirable to carry out the
purposes of the  Agreement,  the officers and  directors of Company,  Parent and
Acquireco,  as the  case  may be,  are  fully  authorized  in the  name of their
corporation  or otherwise to take,  and will use good faith efforts to take, all
such lawful and  necessary  action,  so long as such action is not  inconsistent
with this Agreement.

3.7      DISSENTING SHAREHOLDERS. Company shall give Parent prompt notice of any
holders of shares who have not voted such shares for approval of the Arrangement
Resolution  and who have  perfected  Dissent  Rights (and shall also give Parent
prompt notice of any  withdrawals of such demands for Dissent Rights) and Parent
shall have the right to direct all  negotiations and proceedings with respect to
such demands.

                                    ARTICLE 4

                                RIGHTS OF DISSENT

4.1      RIGHTS OF DISSENT.

         Shareholders of the Company may exercise Dissent Rights pursuant to and
strictly in the manner set forth in the Interim  Order,  section 190 of the CBCA
and  this  Section  4.1  (the  "Dissent  Procedures")  in  connection  with  the
Arrangement.  Shareholders  of the Company who duly exercise such Dissent Rights
and who:

         (a)      are ultimately entitled to be paid fair value for their Shares
                  shall be deemed to have  transferred  such  Company  Shares to
                  Company for cancellation at the Effective Time; or

         (b)      for any reason are  ultimately  not  entitled  to be paid fair
                  value  for  their  Company  Shares  shall  be  deemed  to have
                  participated  in the  Arrangement  on the  same  basis  as any
                  non-dissenting  Shareholder as at and from the Effective Time,
                  and  subject  to  Article  5 hereof,  shall  have the right to
                  receive  consideration,  on the basis determined in accordance
                  with Article 3 hereof;


                                       6
<PAGE>

but in no case  shall  Company  or  Acquireco  be  required  to  recognize  such
Dissenting  Shareholders as holders of Company Shares at and after the Effective
Time,  and the  names of such  Dissenting  Shareholders  shall be  deleted  from
Company's register of holders of Company Shares at the Effective Time.

                                    ARTICLE 5

                                     PAYMENT

5.1      DELIVERY OF PARENT COMMON STOCK AND CASH BY ACQUIRECO.

         Immediately  upon the filing of the Articles of Arrangement,  Acquireco
shall cause to be available to the Depositary, for payment to holders of Company
Shares,  (i) cash and the  certificates of Parent Common Stock  representing the
number of whole shares of Parent  Common Stock  issuable  pursuant to subsection
3.1(a) and 3.1(b) in exchange for Company  Common  Shares and Company  Preferred
Shares  outstanding  immediately prior to the Effective time and (ii) sufficient
funds to permit  payment in lieu of fractional  shares  pursuant to section 3.2,
for delivery to such holders in accordance  with Section 5.2 hereof.  As soon as
practicable  after the  Effective  Time,  (i) such  payments of shares of Parent
Common  Stock  shall  be  made  by  the   Depositary  by  issuing   certificates
representing  such shares to the  shareholders  of  Company;  and (ii) such cash
payments shall be made by the Depositary by issuing cheques to the  shareholders
of  Company.  All  interest  on funds  provided  to and  held by the  Depositary
pursuant to this Section 5.1 shall accrue to the benefit of Acquireco.

5.2      METHOD OF PAYMENT.

         The  Depositary  shall forward to each  Shareholder  who,  prior to the
Effective  Date,  has  deposited  a properly  completed  Letter of  Transmittal,
together  with  his  or  her  Company  Share   certificates,   the  certificates
representing  shares of Parent  Common  Stock and the cash to which he or she is
entitled as soon as  reasonably  practicable  but, in any event,  not later than
three Business Days after the Effective  Date.  The Depositary  shall forward to
each  Shareholder  who,  after the  Effective  Date,  has  deposited  his or her
properly completed Letter of Transmittal, together with his or her Company Share
certificates,  the certificates  representing  shares of Parent Common Stock and
the cash to which he or she is entitled  within three  Business  Days  following
receipt  by the  Depositary  of such  letters  and  share  certificates.  Unless
otherwise  directed in  accordance  with any Letter of  Transmittal,  such share
certificates  and  cheques  shall be  forwarded  by first  class  mail,  postage
prepaid,  or, in the case of a postal disruption in the United States or Canada,
by such other means as the Depositary may consider  prudent,  to the persons and
at the  addresses  specified  in  the  relevant  Letter  of  Transmittal.  Share
certificates and cheques  forwarded  pursuant hereto will be deemed to have been
delivered  at the time of  delivery  thereof to the post office or to such other
party as may be charged with responsibility for the transmission thereof.

5.3      LIMITATION.

         Any certificate formerly representing Company Shares not deposited with
all of the other documents and instruments  required by this Plan of Arrangement
on or prior to the  sixth  anniversary  of the  Effective  Date  shall  cease to
represent any claim to which the holder thereof would otherwise be entitled.  On
such  date,  all cash or  shares to which the  former  registered  holder of the
certificate  referred to in the preceding  sentence was entitled shall be deemed
to have been surrendered to Acquireco together with all dividends, distributions
and interest held for such former registered holder.


                                       7
<PAGE>

5.4      AMENDMENTS TO PLAN OF ARRANGEMENT.

         Company reserves the right to amend, modify and/or supplement this Plan
of  Arrangement  at any time and from  time to time,  provided  that  each  such
amendment,  modification and/or supplement must be (i) set out in writing,  (ii)
approved by  Acquireco,  (iii) filed with the Court and, if made  following  the
Company Shareholders'  Meeting,  approved by the Court, and (iv) communicated to
holders of Company Shares if and as required by the Court.

         Any amendment,  modification  or supplement to this Plan of Arrangement
may be  proposed  by  Company  at any time  prior to the  Company  Shareholders'
Meeting  (provided that Acquireco shall have consented  thereto) with or without
any other prior notice or communication,  and if so proposed and accepted by the
persons  voting  at the  Company  Shareholders'  Meeting  (other  than as may be
required under the Interim Order), shall become part of this Plan of Arrangement
for all purposes.

         Any amendment,  modification  or supplement to this Plan of Arrangement
that is approved by the Court following the Company  Shareholders' Meeting shall
be effective  only if (i) it is  consented to by each of Company and  Acquireco,
and (ii) if required by the Court or  applicable,  it is consented to by holders
of the Company Shares voting in the manner so required.








                                                                  EXECUTION COPY

                               AMENDMENT NO. 1 TO
                              SHAREHOLDER AGREEMENT

      Amendment No. 1 dated as of April 17, 2000 (this "AMENDMENT") to the
Shareholder Agreement dated as of November 17, 1999 (the "SHAREHOLDER
AGREEMENT") among Baxter International Inc., a Delaware corporation
("PARENT"), and the undersigned shareholders (each, a "SHAREHOLDER") of North
American Vaccine, Inc., a corporation existing under the federal laws of
Canada ("COMPANY").

                                    RECITALS

      WHEREAS, Parent and the Shareholders desire to amend the Shareholder
Agreement as set forth in this Amendment;

      WHEREAS, concurrently with the execution of this Amendment, Parent,
Company and Neptune Acquisition Corp., an unlimited liability company existing
under the laws of the Province of Nova Scotia and a wholly owned subsidiary of
Parent ("ACQUIRECO"), have entered into Amendment No. 1 to the Share Exchange
Agreement dated as of November 17, 1999 among Parent, Acquireco and Company;

      NOW, THEREFORE, in consideration of the foregoing, and other good and
valuable consideration, the receipt and adequacy of which are hereby
acknowledged, and intending to be legally bound hereby, the parties hereto
hereby agree as follows:

      1. The first recital of the Shareholder Agreement is hereby amended and
restated in its entirety to read as follows:

      "WHEREAS, pursuant to a Share Exchange Agreement dated as of November 17,
1999 by and among Parent, Neptune Acquisition Corp., an unlimited liability
company existing under the laws of the Province of Nova Scotia and a wholly
owned subsidiary of Parent ("ACQUIRECO") and Company, as amended by Amendment
No. 1 dated as of April 17, 2000 (such agreement, as so amended, is hereinafter
referred to as the "SHARE EXCHANGE AGREEMENT"), Parent has agreed to exchange
the outstanding securities of Company pursuant to an exchange by Acquireco of
all of the capital stock of the Company (the "ARRANGEMENT"), in which each
outstanding share of capital stock of Company (the "COMPANY SHARES") will be
exchanged for cash and shares of common stock of Parent (the "PARENT SHARES") as
set forth in the Share Exchange Agreement (the "TRANSACTION");"

      2. This Amendment shall be deemed an amendment to the Shareholder
Agreement and shall become effective when executed by Parent and the
Shareholders as required by Section 10 of the Shareholder Agreement. Except as
expressly amended pursuant to this Amendment, the Shareholder Agreement shall
continue in full force and effect.


<PAGE>

      3. This Amendment shall be governed by, construed and enforced in
accordance with the internal laws of the State of New York without giving effect
to the principles of conflicts of law thereof.

      4. This Amendment may be executed in several counterparts, each of which
shall be an original, but all of which together shall constitute one and the
same agreement.



                                       2
<PAGE>




      IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
executed as of the date first written above by their respective officers
thereunto duly authorized.

                                    BAXTER INTERNATIONAL INC.


                                    By: /s/ Timothy B. Anderson
                                        -----------------------------------
                                          Name:  Timothy B. Anderson
                                          Title: Group Vice President,
                                                 Corporate Strategy and
                                                  Development
































                                       3
<PAGE>



                              BIOCHEM PHARMA INC.





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



                              By:  /s/ Fred Andrew
                                  -----------------------------------
                                    Name:  Fred Andrew
                                    Title: Chief Financial Officer































<PAGE>

                   FROST-NEVADA LIMITED PARTNERSHIP



                   By:  /s/ David Moskowitz
                      -----------------------------------
                       Name:  David Moskowitz
                       Title: President, Frost-Nevada Corporation
                              General Partner, Frost-Nevada Limited Partnership
























<PAGE>


                                          SHAREHOLDER
                                          /s/ Phillip Frost, M.D.
                                          -------------------------------------
                                          (Signature)









<PAGE>


                                          IVAX CORPORATION



                                      By: /s/ Phillip Frost, M.D.
                                          -------------------------------------
                                           Name:  Phillip Frost, M.D.
                                           Title: Chairman of the Board





April 17, 2000

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

Baxter International Inc.
One Baxter Parkway
Deerfield, Illinois 60015
Attention: General Counsel



Dear Sirs:

            Reference is made to the Warrant No. W-1 dated July 21, 1999 of
North American Vaccine, Inc. (the "COMPANY") registered in the name of BioChem
Pharma Inc. ("BCPI") for the purchase of 250,000 common shares, no par value, of
the Company (the "COMPANY SHARES"), Warrant No. W-2 dated August 26, 1999 of the
Company registered in the name of BCPI for the purchase of 250,000 Company
Shares and Warrant No. W-3 dated October 28, 1999 of the Company registered in
the name of BCPI for the purchase of 250,000 Company Shares (collectively, the
"WARRANTS").

            In order to induce Baxter International Inc., a Delaware corporation
("PARENT") to enter into the Share Exchange Agreement dated as of November 17,
1999, as amended by Amendment No. 1 dated as of April 17, 2000 (such agreement,
as so amended, is hereinafter referred to as the "SHARE EXCHANGE AGREEMENT")
among Parent, Neptune Acquisition Corp., an unlimited liability company existing
under the laws of the Province of Nova Scotia and a wholly owned subsidiary of
Parent, and Company, and in consideration of the payment by Parent of the amount
determined in accordance with Section 3.03(b) of the Share Exchange Agreement,
BCPI hereby agrees, subject to the consummation of the transactions contemplated
by the Share Exchange Agreement, as follows:

            (i) the Warrants shall terminate and be of no further force or
effect as of the Effective Time (as defined in the Share Exchange Agreement)
without any further action on the part of Company or BCPI; and

            (ii) BCPI hereby waives, effective as of the Effective Time, any and
all rights it has or may have under the Warrants, including, without limitation,
the right to receive shares of capital stock of Parent as a result of the
transactions contemplated by the Share Exchange Agreement.


<PAGE>

                                       BIOCHEM PHARMA INC.


                                       By  /s/ Fred Andrew
                                          -------------------------------------
                                       Name:  Fred Andrew
                                       Title: Chief Financial Officer





                                       By  /s/ Charles-A. Tessier
                                          -------------------------------------
                                       Name: Charles A. Tessier
                                       Title: Vice President, Legal Affairs
                                       and General Counsel


ACCEPTED AND AGREED as of the
date first written above:

NORTH AMERICAN VACCINE, INC.




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

BAXTER INTERNATIONAL INC.




 By: /s/ Timothy B. Anderson
     -----------------------------------
       Name:  Timothy B. Anderson
       Title: Group Vice President,
              Corporate Strategy and
               Development







                                       2





                                                               EXECUTION VERSION

                ASSIGNMENT, ACCEPTANCE AND AMENDMENT AGREEMENT
                              DATED APRIL 17, 2000

            Reference is made to the letter loan agreement dated as of November
1, 1999 (as amended, renewed, extended, amended and restated, supplemented or
otherwise modified from time to time, the "CREDIT AGREEMENT"; the terms defined
therein, unless otherwise defined herein, being used herein as therein defined)
between North American Vaccine, Inc., a Canadian corporation (the "BORROWER"),
and Bank of America, N.A. (the "ORIGINAL LENDER").

            WHEREAS, the Original Lender wishes to sell and assign all of its
rights and obligations under the Loan Documents to BioChem Pharma Inc., a
Canadian corporation (the "NEW LENDER"), and the Borrower wishes to consent to
such sale and assignment upon the terms set out herein; and

            WHEREAS, upon such sale and assignment, the Original Lender will
release the Guaranty and the Guarantor will release the Reimbursement Agreement
on the terms set out herein.

            NOW, THEREFORE, in consideration of the foregoing, and other good
and valuable consideration, the receipt and adequacy of which are hereby
acknowledged, and intending to be legally bound hereby, the parties hereto
agree, with effect from the Effective Date (as defined in Section 1), as
follows:

            1. Upon receipt of the Payoff Amount (as defined below) by the
Original Lender in immediately available funds delivered in accordance with
wiring instructions delivered by the Original Lender to the New Lender (or its
representatives), the Original Lender hereby agrees to sell and assign, without
recourse and without representation or warranty (except as to the
representations and warranties expressly made by Original Lender in paragraph 2
below) to the New Lender, and the New Lender hereby agrees to purchase and
assume from the Original Lender, all of the Original Lender's rights and
obligations under the Credit Agreement and the other Loan Documents. The
Borrower hereby consents to such sale and assignment from the Original Lender to
the New Lender. This Agreement shall become effective on April 17, 2000 (the
"EFFECTIVE DATE"). The aggregate amount owed to the Original Lender with respect
to the Loans (inclusive of principal, interest, commitment fees, other fees,
expense reimbursements and all other amounts owed to the Original Lender in
respect to such indebtedness) through and including the Effective Date is
US$19,549,190.40 (the "PAYOFF AMOUNT"). In the event that the Payoff Amount is
not received on or prior to 4:00 p.m. (Charlotte, North Carolina time) on April
17, 2000, the Loans will continue to accrue interest (at the Base Rate plus 2%)
at a per diem amount of US$5933.58 for each day after April 17, 2000 that the
Original Lender has not received payment in full prior to 4:00 p.m (Charlotte,
North Carolina time) in immediately available funds in accordance with the
wiring instructions delivered by the Original Lender. After giving effect to

<PAGE>

such sale and assignment, the amount of the Loans owing to the New Lender will
be US$19,549,190.40.

            2. The Original Lender (i) represents and warrants that it is the
legal and beneficial owner of the interest or interests being assigned by it
hereunder; (ii) makes no representation or warranty and assumes no
responsibility with respect to any statements, warranties or representations
made in or in connection with any Loan Document or the execution, legality,
validity, enforceability, genuineness, sufficiency or value of, or the
perfection or priority of any lien or security interest created or purported to
be created under or in connection with, any Loan Document or any other
instrument or document furnished pursuant thereto; and (iii) makes no
representation or warranty and assumes no responsibility with respect to the
financial condition of the Borrower or the performance or observance by the
Borrower of any of its obligations under any Loan Document or any other
instrument or document furnished pursuant thereto.

            3. The New Lender (i) confirms that it has received a copy of the
Credit Agreement, together with such other documents and information as it has
deemed appropriate to make its own credit analysis and decision to enter into
this Agreement; (ii) agrees that it will, independently and without reliance
upon the Original Lender and based on such documents and information as it shall
deem appropriate at the time, continue to make its own credit decisions in
taking or not taking action under the Credit Agreement; and (iii) agrees that it
will perform in accordance with their terms all of the obligations that by the
terms of the Credit Agreement and the other Loan Documents are required to be
performed by it as the Lender.

            4. (i) The New Lender shall be a party to the Credit Agreement and
the other Loan Documents and, to the extent provided in this Agreement, have the
rights and obligations of the Lender thereunder and (ii) the Original Lender
shall, to the extent provided in this Agreement, relinquish its rights and be
released from its obligations under the Credit Agreement and the other Loan
Documents (other than its rights under the Loan Documents that are specified
under the terms of such Loan Documents to survive the payment in full of the
obligations of the Borrower under the Loan Documents to the extent any claim
thereunder relates to an event arising prior to the Effective Date) and the
Original Lender shall cease to be a party thereto.

            5. From and after the Effective Date, the Borrower shall make all
payments under the Credit Agreement in respect of the interest assigned hereby
(including, without limitation, all payments of principal, interest and
commitment fees with respect thereto) to the New Lender. The Original Lender and
the New Lender shall make all appropriate adjustments in payments under the
Credit Agreement for periods prior to the Effective Date.

            6. On the Effective Date, without any action on the part of the
Guarantor or the Borrower, (i) the Guaranty will be terminated and the Guarantor
unconditionally and irrevocably released, and (ii) the Reimbursement Agreement,
the Security Agreement dated November 1, 1999 between the Guarantor and the
Borrower and the Patent and Trademark Assignment and Security Agreement, dated
November 1, 1999 between the Guarantor and the Borrower will each be terminated


                                      -2-
<PAGE>

and the Borrower unconditionally and irrevocably released. The parties further
agree that the Guarantor is a party to this Agreement solely for the purposes of
this Section 6, and the Guarantor shall have no rights or liabilities under this
Agreement other than those set out in this Section 6 and Sections 12 and 13.

            7. Immediately following the sale and assignment under Sections 1 to
5, and the releases and terminations under Section 6, the New Lender, Dr.
Phillip Frost ("FROST") and the Borrower agree that the Credit Agreement shall
be assigned as set forth in Part I of Schedule A and amended as set forth in
Part II of Schedule A.

            8.    The Borrower represents and warrants to each of the New
Lender and Frost as follows:

            (1)   the representations and warranties contained in each Loan
                  Document are correct on and as of the date hereof, after
                  giving effect to this Agreement, as though made on and as of
                  the date hereof, other than any such representations or
                  warranties that by their terms, refer to a specific date, in
                  which case, as of such specific date; and

            (2)   no Default or Event of Default which has not been waived has
                  occurred and is continuing under the Credit Agreement, as
                  amended hereby, or would result from this Agreement or the
                  consummation of the transactions contemplated hereby.

            9.    Without prejudice to any Default or Event of Default
arising after the date hereof:

            (3)   with respect to any Default or Event of Default (other than
                  one under Section 5(k) of the Credit Agreement) which is
                  continuing, which event does not have a grace or cure period
                  and which event arose on or before the date hereof, the New
                  Lender and Frost hereby waive their respective rights under
                  the last paragraph of Section 5 of the Credit Agreement; and

            (4)   with respect to any Default or Event of Default (other than
                  one under Section 5(k) of the Credit Agreement) which is
                  continuing, which event has a grace or cure period and which
                  event arose on or before the date hereof, such grace or cure
                  period shall be deemed to commence on the date hereof.

            10.   (a)   Each reference in the Credit Agreement to "this
                        Agreement", "hereunder", "hereof" or words like
                        import referring to the Credit Agreement, and each
                        reference in each of the other Loan Documents to "the
                        Credit Agreement", "thereunder", "thereof" or words
                        of like import referring to the Credit Agreement,


                                      -3-
<PAGE>

                        shall mean and be a reference to the Credit
                        Agreement, as amended by this Agreement.

                  1     The Credit Agreement and each of the other Loan
                        Documents, as specifically amended by this Agreement,
                        are and shall continue to be in full force and effect
                        and are hereby in all respects ratified and confirmed.

                  (2)   The execution, delivery and effectiveness of this
                        Agreement shall not, except as expressly provided
                        herein, operate as a waiver of any right, power or
                        remedy by the New Lender under any of the Loan
                        Documents, nor constitute a waiver of any provision of
                        any of the Loan Documents.

                  (a)   This Agreement shall become effective on the Effective
                        Date; provided that the Effective Date shall be deemed
                        modified to be the actual date of the sale and
                        assignment to the extent the parties do not close on
                        April 17, 2000.

                  (b)   The Borrower agrees to pay on demand all costs and
                        expenses of the Original Lender and the New Lender in
                        connection with the preparation, execution, delivery
                        and administration, modification and amendment of
                        this Agreement and the other instruments and
                        documents to be delivered hereunder (including,
                        without limitation, the reasonable fees and expenses
                        of counsel for the Original Lender and the New
                        Lender) in accordance with the terms of Section 6(i)
                        of the Credit Agreement.  In addition, the Borrower
                        shall pay any and all stamp and other taxes payable
                        or determined to be payable in connection with the
                        execution and delivery of this Agreement and the
                        other instruments and documents to be delivered
                        hereunder, and agrees to hold the New Lender harmless
                        from and against any and all liabilities with respect
                        to or resulting from any delay in paying or omission
                        to pay such taxes.

                  (c)   This Agreement shall be governed by, and construed in
                        accordance with, the laws of the State of New York.

                  (d)   This Agreement may be executed in any number of
                        counterparts and by different parties hereto in
                        separate counterparts, each of which when so executed
                        shall be deemed to be an original and all of which
                        taken together shall constitute one and the same
                        agreement.  Delivery of an executed counterpart of
                        this Agreement by telecopier shall be effective as
                        delivery of an original executed counterpart of this
                        Agreement.




                                      -4-
<PAGE>

            IN WITNESS WHEREOF, the parties hereto have caused this Agreement to
be executed by their duly authorized officers.

                                    THE ORIGINAL LENDER

                                    BANK OF AMERICA, N.A. as Original Lender

                                    By:  /s/ Larry [illegible]
                                        --------------------------------------
                                          Title: Principal
                                          Date:  April 17, 2000


                                    THE NEW LENDER

                                    BIOCHEM PHARMA INC. as New Lender

                                    By:  /s/ Fred Andrew
                                        --------------------------------------
                                          Title: Chief Financial Officer
                                          Date:  April 17, 2000


                                    By:  /s/ Charles-A. Tessier
                                        --------------------------------------
                                          Title: Vice President Legal Affairs &
                                                  General Counsel
                                          Date:  April 17, 2000


                                    THE BORROWER

                                    NORTH AMERICAN VACCINE, INC. as Borrower

                                    By:  /s/ Randal Chase
                                        --------------------------------------
                                          Title: President and Chief Executive
                                                  Officer
                                          Date:  April 17, 2000




                                      -5-
<PAGE>


                                    THE GUARANTOR

                                    BAXTER INTERNATIONAL INC. as Guarantor

                                    By:  /s/ Timothy B. Anderson
                                        --------------------------------------
                                          Title: Group Vice President
                                                  Corporate Strategy and
                                                  Development
                                          Date:  April 17, 2000


                                    FROST
                                           /s/ Phillip Frost, M.D.
                                    ----------------------------------------
                                          Dr. Phillip Frost
                                          Date:  April 17, 2000




                                      -6-
<PAGE>




                                   SCHEDULE A
                                     PART I

                         ASSIGNMENT OF CREDIT AGREEMENT

            1. In consideration of the sum of US$1 paid by Frost to the New
Lender (the receipt and sufficiency of which is hereby acknowledged), the New
Lender hereby sells and assigns, without recourse except as to the
representations and warranties made by it herein, to Frost, and Frost hereby
purchases and assumes from the New Lender, an interest in and to the New
Lender's rights and obligations under the Credit Agreement as of the date hereof
as specified below:

            Amount of Commitment Assigned:      $5,000,000
            Amount of Loans Assigned:           $0

After giving effect to such sale and assignment, the amount of the Loans owing
to the New Lender will be US$19,549,190.40.

            2. The New Lender (i) represents and warrants that it is the legal
and beneficial owner of the interest or interests being assigned by it under the
Assignment, Acceptance and Amendment Agreement dated April 17, 2000 and that
such interest or interests are free and clear of any adverse claim; (ii) makes
no representation or warranty and assumes no responsibility with respect to any
statements, warranties or representations made in or in connection with any Loan
Document or the execution, legality, validity, enforceability, genuineness,
sufficiency or value of, or the perfection or priority of any lien or security
interest created or purported to be created under or in connection with, any
Loan Document or any other instrument or document furnished pursuant thereto;
and (iii) makes no representation or warranty and assumes no responsibility with
respect to the financial condition of the Borrower or the performance or
observance by the Borrower of any of its obligations under any Loan Document or
any other instrument or document furnished pursuant thereto.

            3. Frost (i) confirms that he has received a copy of the Credit
Agreement, together with such other documents and information as he has deemed
appropriate to make his own credit analysis and decision to enter into this
Agreement; (ii) agrees that he will, independently and without reliance upon the
New Lender and based on such documents and information as he shall deem
appropriate at the time, continue to make his own credit decisions in taking or
not taking action under the Credit Agreement; and (iii) agrees that he will
perform in accordance with their terms all of the obligations that by the terms
of the Credit Agreement are required to be performed by him as the Lender to the
extent of the obligations assumed by him under this Agreement.

            4. (i) Frost shall be a party to the Credit Agreement and, to the
extent provided in this Agreement, have the rights and obligations of the Lender
thereunder and (ii) the New Lender shall, to the extent provided in this


                                      A-1
<PAGE>

Agreement, relinquish its rights and be released from its obligations under the
Credit Agreement (other than its rights and obligations under the Loan Documents
that are specified under the terms of such Loan Documents to survive the payment
in full of the obligations of the Borrower under the Loan Documents to the
extent any claim thereunder relates to an event arising prior to the Effective
Date).

            5. The Borrower shall make all payments under the Credit Agreement
in respect of the interest assigned hereby (including, without limitation, all
payments of principal, interest and commitment fees with respect thereto) to
Frost.

            6. It is the intention of the New Lender, the Borrower and Frost
that Frost shall not have any right or interest in or to any of the Security
Agreement, the IP Security Agreement and the Pledge Agreement (the "SECURITY
DOCUMENTS"). The New Lender agrees with Frost that, to the extent the New Lender
receives or realizes any proceeds under or in respect of the Security Documents
or the collateral covered thereby or subject thereto, the New Lender shall,
after deduction of all reasonable costs and expenses incurred by the New Lender
in the realization of such proceeds, pay to Frost an amount equal to Frost's
Share of such net proceeds. For the purpose of this paragraph, "FROST'S SHARE"
shall mean the result (expressed as a percentage) of dividing the aggregate
outstanding principal amount of Loans made by Frost by the aggregate outstanding
principal amount of all Loans made by the New Lender and Frost, in each case
calculated on the date of receipt of such proceeds by the New Lender. New Lender
covenants and agrees for the benefit of Frost that, upon the occurrence and
during the continuance of an Event of Default under the Credit Agreement, it
will take all commercially reasonable action to enforce the Lender's rights
thereunder.












                                      A-2
<PAGE>


                                   SCHEDULE A
                                     PART II

                         AMENDMENTS TO CREDIT AGREEMENT

      3.    In the first paragraph, the words "BANK OF AMERICA, N.A. ("LENDER")
            is" shall be deleted and replaced with the words "BIOCHEM PHARMA
            INC. ("LENDER") and DR. PHILLIP FROST ("FROST") are"

      4.    Section 1(a) (other than the heading) shall be deleted in its
            entirety and replaced with the words:

            "Subject to the terms and conditions set forth herein, Lender and
            Frost, on a several (and not joint) basis, agree to make available
            to Borrower until the Maturity Date a revolving line of credit
            providing for loans ("LOANS") in an aggregate principal amount not
            exceeding at any time US$45,000,000; PROVIDED, HOWEVER, Lender shall
            not be obligated to make Loans in an aggregate principal amount
            exceeding US$40,000,000 (the "BIOCHEM COMMITMENT") and Frost shall
            not be obligated to make Loans in an aggregate principal amount
            exceeding US$5,000,000 (the "FROST COMMITMENT", and together with
            the BioChem Commitment, the "COMMITMENTS" and each a "COMMITMENT ")
            and PROVIDED FURTHER, HOWEVER, that Frost shall not, and shall not
            be obligated to, make any Loans hereunder until the BioChem
            Commitment has been drawn down in full by the Borrower and remains
            outstanding. Subject to the foregoing limits, Borrower may borrow,
            repay and reborrow Loans with until the Maturity Date.".

      5.    Section 1(b) (other than the heading) shall be deleted in its
            entirety and replaced with the words:

            "Borrower may request that Loans be made by irrevocable notice to be
            received by Lender or Frost (as the case may be) not later than
            11:00 a.m. on the third Business Day before the day of the proposed
            Loan, or such shorter period as Lender or Frost (as the case may be)
            may agree. Such request may not be made as more frequently than
            weekly, and shall be accompanied by details of the proposed use by
            Borrower of such Loan.".

      6.    The first two paragraphs of Section 1(c) (other than the heading)
            shall be deleted in their entirety and replaced with the words:

            "Interest on the unpaid principal amount of each Loan shall accrue
            monthly from the date of the making thereof until the principal
            amount thereof shall be repaid in full at a rate of 15% per annum
            and shall be payable monthly in arrears and on the repayment or
            maturity of each Loan, by acceleration or otherwise.".



                                      A-3
<PAGE>

      7.    In Section 1(c), in the third paragraph, the words "Base Rate" shall
            be deleted and replaced with the words "rate specified in the
            preceding paragraph".

      8.    In Section 1(c), in the fourth paragraph, after the word "Lender"
            the words "or Frost" shall be added.

      9.    In Section 1(d) the first sentence shall be deleted in its entirety
            and replaced with the words:

            "The Loans and all payments thereon shall be evidenced by Lender's
            and Frost's (as the case may be) loan accounts and records;
            PROVIDED, HOWEVER, that upon the request of Lender or Frost (as the
            case may be), the Loans of Lender or Frost (as the case may be) may
            be evidenced by grid promissory notes (each a "NOTE") in the form of
            EXHIBIT B hereto, instead of or in addition to such loan accounts
            and records.".

      10.   In Section 1(e), paragraphs (i) and (ii) shall be deleted in their
            entirety and replaced with the words:

            "(i)  BIOCHEM DEFERRED FUNDING FEE.  The Borrower shall pay to
            Lender a deferred funding fee of $10,000,000 on the Maturity Date.

            (ii) FROST DEFERRED FUNDING FEE. Providing at least one Loan has
            been made by Frost on or before the Maturity Date, the Borrower
            shall pay to Frost a non-assignable and non-transferrable deferred
            funding fee of $1,250,000 on the Maturity Date.

            (iii) FROST COMMITMENT FEE.  If no Loan has been made by Frost on
            or before the Maturity Date, the Borrower shall pay to Frost a
            commitment fee of $50,000 on the Maturity Date.".

      11.   In Section 1(f), the second paragraph shall be deleted in its
            entirety and replaced with the words:

            "Borrower shall make (i) all payments to Lender required hereunder
            not later than 1 p.m. on the date of payment in same day funds in
            United States Dollars to the bank of Lender located at Royal Bank of
            Canada, 3100 Le Carrefour Blvd, Laval, Quebec Canada, H7T 2K2,
            transit number: 02301, account number: 406-610-6 or such other bank
            or address as Lender may from time to time designate in writing and
            (ii) all payments to Frost required hereunder not later than 1 p.m.
            on the date of payment in same day funds in United States Dollars to
            the bank of Frost located at such bank or address as Frost may from
            time to time designate in writing.".



                                      A-4
<PAGE>

      12.   In Section 1(f):

            (1)   in the third paragraph, each occurrence of the word "Lender"
                  shall be deleted and replaced with the words "Lender or Frost
                  (as the case may be)"; and

            (2)   in line fourteen, after the words "is organized" the words "or
                  resident" shall be added.

      13.   Section 1(g) shall be deleted in its entirety and replaced with the
            words:

            "PREPAYMENTS. Borrower may, upon same-day notice, prepay the Loans
            on any Business Day. Prepayments must be accompanied by a payment of
            interest on the amount so prepaid. Prepayments must be in a
            principal amount of at least $500,000 or a multiple of $100,000 in
            excess thereof. If any prepayment is made at a time when Loans from
            Lender and Frost are outstanding, such prepayment of principal and
            interest shall be paid to Lender and Frost pro rata to the aggregate
            outstanding amount of their respective Loans".

      14.   In Section 2(c), paragraph (i), the words "and Guarantor" shall be
            deleted and replaced with the words "or Frost".

      15.   In Section 3, in the first line, after the word "Lender" the words
            "and Frost" shall be added.

      16.   In Section 3(f):

            (1)   in the first line, the word "solely" shall be deleted; and

            (2)   in the second line, after the word "Borrower" the words "or
                  for such other purposes as Lender or Frost (as the case may
                  be) may approve" shall be added.

      17.   In Section 3(j), in the first line, after the word "Lender" the
            words "or Frost" shall be added.

      18.   In Section 3(l) the words "and Guarantor" shall be deleted.

      19.   In Section 4(a), in the first line, after the word "Lender" the
            words "and, if Frost shall so request, to Frost" shall be added.

      20.   Section 4(b)(ii) shall be deleted in its entirety and replaced with
            the words:



                                      A-5
<PAGE>

            "(ii) comply with all applicable laws, rules, regulations and
                  orders, such compliance to include, without limitation,
                  compliance with ERISA, the Racketeer Influenced and Corrupt
                  Organizations Chapter of the Organized Crime Control Act of
                  1970, Environmental Laws and Environmental Permits, in each
                  case the violation of which could result in a Material Adverse
                  Effect.".

      21.   In Section 4(b)(v) after the word "Lender" the words "and Frost"
            shall be added.

      22.   In Section 4(b)(vi):

            (1)   in the first line, the words "and (B)" shall be deleted and
                  replaced with the words ", (B) all of its stock and other
                  collateral subject to the Pledge Agreement and (C);

            (2)   in the fourth line, after the word "Lender" the words "and
                  Frost" shall be added;

            (3)   in the fifth line, after the words "IP Security Agreement" the
                  words ", the Pledge Agreement" shall be added; and

            (4)   in the last line, the word "and" shall be deleted.

      23.   In Section 4(b)(vii) the full stop at the end shall be deleted and
            replaced with the words "; and", and the following paragraphs shall
            be added:

            "(viii)  preserve and maintain its  existence  and legal  structure,
                     provided,  however,  that the Borrower and its Subsidiaries
                     may consummate any merger or consolidation  permitted under
                     Section 4(c) (iii); and

            (vix)    keep true  records  and books of account  in which  entries
                     will be made of all dealings or transactions in relation to
                     its  business  and  affairs in  accordance  with  generally
                     accepted accounting  principles,  to the extent applicable,
                     applied on a consistent basis.".

      24.   In Section 4(c)(i) the full stop at the end shall be deleted and
            replaced with the words " and (C) Indebtedness in an aggregate
            amount of up to $5,000,000 provided such Indebtedness is
            subordinated to the Indebtedness under the Loan Documents in a
            manner reasonably satisfactory to Lender and Frost".

      25.   In Section 4(c), paragraph (iii), the words "(other than Guarantor
            or any Affiliate Guarantor)" shall be deleted.

      26.   After Section 4(c)(xii) the following paragraphs shall be added:



                                      A-6
<PAGE>

            "(xiii)  ORGANIZATIONAL   DOCUMENTS.   Amend,  modify,   restate  or
                     supplement its  Certificate of  Incorporation  or Bylaws if
                     such action  could  reasonably  be  expected  to  adversely
                     affect the rights of the Lender under the Credit Agreement,
                     the IP  Security  Agreement,  the Pledge  Agreement  or the
                     Security Agreement.

            (xiv)    SUBSIDIARIES.  Form,  create or acquire any  Subsidiary  or
                     permit any Person other than the Borrower or a wholly owned
                     Subsidiary  to hold an equity  interest in any  Subsidiary,
                     other than pursuant to the Pledge Agreement.

            (xv)     PARTNERSHIPS,  ETC. Become a general partner in any general
                     or  limited  partnership  or joint  venture  other than any
                     Subsidiary the sole assets of which consist of its interest
                     in such partnership or joint venture."

      27.   In Section 5(g) after each occurrence of the word "Lender" the words
            "and Frost" shall be added.

      28.   Section 5(h) shall be deleted in its entirety and replaced with the
            words "Intentionally Omitted".

      29.   In Section 5(m) after the words "any party thereto" the words "or
            terminated automatically in accordance with its terms; PROVIDED,
            HOWEVER, that (i) if the date by when the Effective Time (as defined
            in the North American Vaccine Acquisition Agreement) shall have
            occurred has been extended pursuant to Section 9.01(b) of the North
            American Vaccine Acquisition Agreement, it shall not be an Event of
            Default under this Section 5(m) until such extended date; or (ii) in
            any other circumstance, it shall not be an Event of Default under
            this Section 5(m) until 15 calendar days have elapsed" shall be
            added.

      30.   In Section 5(o) the full stop at the end shall be deleted and
            replaced with the words "; or", and the following paragraph shall be
            added:

            "(p)  Rejection by UK authorities of NeisVac-C(TM)application.".

      31.   In the last paragraph of Section 5:

            (1)   the words "Upon the occurrence of an Event of Default, Lender
                  may declare the Commitment to be terminated, whereupon the
                  Commitment shall be terminated," shall be deleted and replaced
                  with the words:

                  "Upon the occurrence of an Event of Default, which Event of
                  Default (other than any of the events specified in Sections
                  5(i),(j) or (m) above)) has not been cured within 10 calendar


                                      A-7
<PAGE>

                  days thereof, Lender or Frost may declare its or his
                  respective Commitment to be terminated, whereupon such
                  Commitment shall be terminated,"; and

            (2)   in line eight, the word "Commitment" shall be deleted and
                  replaced with the word "Commitments".

      32.   In Section 6(b) the words "Charlotte, North Carolina" shall be
            deleted and replaced with the words "Quebec, Canada".

      33.   Sections 6(c) and (d) shall be deleted in their entirety and
            replaced with the words "Intentionally Omitted".

      34.   In Section 6(f):

            (1)   in the second line, after the word "Lender" the words "or
                  Frost (as the case may be)" shall be added;

            (2)   in the fourth line, after the word "Lender" the words "and
                  Frost" shall be added; and

            (3)   in the second line, after the word "Lender" the words "or
                  Frost (as the case may be)" shall be added.

      35.   In Section 6(h):

            (1)   in the third line, after the word "LENDER" the words "OR FROST
                  (AS THE CASE MAY BE)" shall be added;

            (2)   in the ninth line, the words "(B) GUARANTOR OR (C)" shall be
                  deleted and replaced with the words "OR (B)"; and

            (3)   the final two sentences shall be deleted and replaced with the
                  words:

                  "Borrower agrees to execute any documents reasonably requested
                  by Lender or Frost (as the case may be) in connection with any
                  such assignment. All information provided by or on behalf of
                  Borrower to Lender or its affiliates or Frost may be furnished
                  by Lender or Frost to Lender's affiliates and to any actual or
                  proposed assignee or participant.".

      36.   In Section 6(i) after each occurrence of the word "Lender" the words
            "or Frost (as the case may be)" shall be added.



                                      A-8
<PAGE>

      37.   In Section 6(m) the word "AND LENDER" shall be deleted and replaced
            with the words ", LENDER AND FROST" shall be added.

      38.   In Exhibit A, the following definitions shall be deleted:

            Base Rate
            Base Rate Loan
            Breakage Costs
            Federal Funds Rate

            Guaranty Event of Default
            Guaranty Obligation
            Interest Period
            Loan Documents
            Maturity Date
            Offshore Rate
            Offshore Rate Loan;

            and the following definitions shall be added:

            Environmental Law:      Any Federal, state, local or foreign
                                    statute, law, ordinance, rule,
                                    regulation, code, order, writ, judgment,
                                    injunction or decree or any judicial or
                                    agency interpretation, policy or guidance
                                    (in the case of the latter, only to the
                                    extent compliance is legally compulsory)
                                    relating to pollution or protection of
                                    the environment, health, safety or
                                    natural resources, including, without
                                    limitation, those relating to the use,
                                    handling, transportation, treatment,
                                    storage, disposal, release or discharge
                                    of Hazardous Materials.

            Environmental Permit:   Any permit, approval, identification
                                    number, license or other authorization
                                    required under any Environmental Law.

            Hazardous Materials:    (a) Petroleum or petroleum products,
                                    by-products or breakdown products,
                                    radioactive materials,
                                    asbestos-containing materials,
                                    polychlorinated biphenyls and radon gas
                                    and (b) any other chemical, materials or
                                    substances designated, classified or
                                    regulated as hazardous or toxic or as a
                                    pollutant or contaminant under any
                                    Environmental Law.

            Loan Documents:         This Agreement, the Security Agreement,
                                    the IP Security Agreement, the Pledge
                                    Agreement and any promissory note,


                                      A-9
<PAGE>

                                    certificate, fee letter, financing
                                    statement and other instrument, document
                                    or agreement delivered in connection with
                                    this Agreement or the Security Agreement
                                    or the IP Security Agreement or the
                                    Pledge Agreement.

            Maturity Date:          June 30, 2000, or such earlier date on
                                    which the Commitments may terminate in
                                    accordance with the terms hereof,
                                    provided, HOWEVER, that (i) if the date
                                    by when the Effective Time (as defined in
                                    the North American Vaccine Acquisition
                                    Agreement) shall have occurred has been
                                    extended pursuant to Section 9.01(b) of
                                    the North American Vaccine Acquisition
                                    Agreement to a date after June 30, 2000,
                                    the Maturity Date shall be deemed to be
                                    extended to such later date, or (ii) if a
                                    Default under Section 5(m) has occurred
                                    and the grace period under such Section
                                    has not expired on or before June 30,
                                    2000, the Maturity Date shall be deemed
                                    to be extended to the end of such grace
                                    period.

            Pledge Agreement:       The Pledge Agreement, if any, between the
                                    Borrower and Lender with respect to
                                    certain stock of Borrower and its
                                    Subsidiaries.

      39.   In Exhibit A, in the definition of Business Day:

            (1)   the words "State of North Carolina" shall be deleted and
                  replaced with the words "Quebec, Canada"; and

            (2)   the words "and, if such day relates to any Offshore Rate Loan,
                  means any such day on which dealings in dollar deposits are
                  conducted by and between banks in the offshore dollar
                  interbank market" shall be deleted.

      40.   In Exhibit A, in the definition of Change of Control, the full stop
            at the end shall be deleted and replace with the words "or (d) upon
            the completion of the North American Vaccine Acquisition."

      41.   In Exhibit A, in the definition of North American Vaccine
            Acquisition Agreement, the words "Agreement and Plan of Merger to
            be" shall be deleted and replaced with the words "Share Exchange
            Agreement dated as of November 17, 1999, as amended by Amendment No.
            1 to Share Exchange Agreement dated as of April 17, 2000".



                                      A-10
<PAGE>

      42.   In Exhibit A, in the definition of Principal Shareholder, the words
            "Guarantor," shall be deleted.

      43.   Exhibit B shall be deleted in its entirety and replaced with the
            attached Exhibit.

*
































                                      A-11
<PAGE>


                                          EXHIBIT TO SCHEDULE A TO ASSIGNMENT,
                                            ACCEPTANCE AND AMENDMENT AGREEMENT

                             FORM OF PROMISSORY NOTE

$[40][5],000,000                                         Dated: April __, 2000

            FOR VALUE RECEIVED, the undersigned, NORTH AMERICAN VACCINE, INC., a
Canadian corporation ("BORROWER"), hereby promises to pay to the order of
[BIOCHEM PHARMA INC. ("LENDER")] [DR. PHILIP FROST ("FROST")] the principal sum
of [FORTY] [FIVE] Million Dollars (US$ [40] [5],000,000) or, if less, the
aggregate unpaid principal amount of all Loans made by [LENDER] [FROST] to
Borrower pursuant to the letter agreement dated as of November 1, 1999 between
Borrower and Bank of America, N.A.("BOA"), as assigned and amended pursuant to
the assignment, acceptance and amendment agreement dated April ___, 2000 between
Borrower, Lender, Frost, BoA and Baxter International Inc. (as so assigned and
amended, and as it may be otherwise amended, restated, extended, supplemented or
otherwise modified from time to time, the "AGREEMENT") on the Maturity Date.

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

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

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

                                          NORTH AMERICAN VACCINE, INC.


                                          By:   ___________________________
                                                Name:
                                                Title:



                                      A-12
<PAGE>

<TABLE>
<CAPTION>

                                 ADVANCES AND PAYMENTS OF PRINCIPAL
=============================================================================================================

                                            AMOUNT OF                UNPAID
                           AMOUNT OF      PRINCIPAL PAID            PRINCIPAL         NOTATION
         DATE               LOAN            OR PREPAID               BALANCE           MADE BY
<S>                        <C>            <C>                       <C>               <C>
- -------------------------------------------------------------------------------------------------------------

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

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

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

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

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

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

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

                                                    A-13
</TABLE>



RELEASE DATE: 4/17/00

NORTH AMERICAN VACCINE AND BAXTER AGREE TO MODIFY SHARE EXCHANGE AGREEMENT

Columbia, MD -- April 17, 2000, North American Vaccine (AMEX: NVX) announced
today that it has agreed with Baxter International Inc. (NYSE: BAX) to modify
the Share Exchange Agreement between the parties. If the acquisition transaction
contemplated by the amended Share Exchange Agreement is consummated, North
American Vaccine shareholders will receive $6.73 per share rather than $7.00 per
share, which will be comprised of $6.70 of Baxter common stock and $0.03 in
cash. Consistent with the original Share Exchange Agreement, the number of
Baxter shares to be issued to North American Vaccine shareholders will be set
based upon the average closing sale price of Baxter common stock for the ten
trading days ending on the fifth trading day prior to consummation of the
transaction. The date by which the transaction is to be completed has been
extended from May 31, 2000 to June 30, 2000. Under the amended Share Exchange
Agreement, the Company will commit an additional $1.3 million to assist it in
retaining employees through June 30, 2000.

The Company has failed to satisfy certain conditions to closing under the
original Share Exchange Agreement. These and the other conditions to closing
have not been modified or waived by the amendment to the Share Exchange
Agreement. In addition, the transaction is still subject to shareholder
approval. As a result, if the acquisition transaction is approved by the North
American Vaccine shareholders, Baxter will have no obligation to consummate the
acquisition transaction. Rather, Baxter will have the option, exercisable in its
discretion, prior to June 30, 2000 to either waive any non-compliance with
conditions to closing and close the transaction or terminate the Share Exchange
Agreement, as amended. Either party, if it is not in breach of the Share
Exchange Agreement, may terminate the transaction if it does not close by June
30, 2000. As under the original Share Exchange Agreement, the North American
Vaccine Board of Directors will recommend that the shareholders vote in favor of
the acquisition transaction. Also as under the original Share Exchange
Agreement, BioChem Pharma Inc. and Frost-Nevada Partnership, which collectively
own approximately 47% of the Company's outstanding equity, have committed to
vote in favor of the acquisition transaction. The Company intends to hold a
special shareholder meeting to approve the acquisition transaction as promptly
as practicable.

Pursuant to a separate agreement, up to $45 million in funding for Company
operations is being provided by BioChem Pharma Inc. and Dr. Phillip Frost
through June 30, 2000. This financing includes BioChem assuming the
approximately $20 million utilized by the Company under a line of credit
provided by Bank of America and guaranteed by Baxter. BioChem is providing an
additional $20 million and Dr. Frost is providing an additional $5 million. This
transitional financing is at a 15% interest rate and is subject to a deferred
financing fee of up to $11.25 million in the aggregate. Baxter will have the
right to provide the final $5.0 million under these interim financing
arrangements in substitution for Dr. Frost and will have a right of first offer
to provide any new financing that the Company may require prior to June 30,
2000. Baxter has consented to these interim financing arrangements and is being
released from its guarantee.


<PAGE>

North American Vaccine, Inc. is engaged in the research, development, production
and sales of vaccines for the prevention of human infectious diseases. North
American Vaccine news releases are available on the Company's web site at
http://www.nava.com.

This press release contains certain forward looking statements, which are made
pursuant to the safe harbor provisions of the Securities Litigation Reform Act
of 1995, including the prospects and timing for consummation of the acquisition
transaction, and the availability of funds under interim financing. Investors
are cautioned that forward looking statements involve risks and uncertainties
that may affect the Company's business and prospects, including without
limitation uncertainties relating to satisfying the conditions for the interim
financing and the consummation of the acquisition transaction, including without
limitation, obtaining the requisite regulatory and shareholder approvals,
together with the risk factors discussed in the Company's reports and filings
with the U.S. Securities and Exchange Commission.

CONTACT: Tom Newberry, Director, Investor Relations, North American Vaccine,
Inc., 10150 Old Columbia Road, Columbia, MD 21046, (410)309-7121.







                                       2


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