ANTEX BIOLOGICS INC
SC 13D/A, 1999-09-24
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549



                                  SCHEDULE 13D


                    UNDER THE SECURITIES EXCHANGE ACT OF 1934
                                (Amendment No. 2)


                              ANTEX BIOLOGICS INC.
- --------------------------------------------------------------------------------
                                (Name of Issuer)


                          Common Stock, $.01 Par Value
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)


                                   03672W-100
- --------------------------------------------------------------------------------
                                 (CUSIP Number)


                Edgar B. Cale III, SmithKline Beecham Corporation
                   One Franklin Plaza, Philadelphia, PA 19102
                             Telephone 215-751-3027
- --------------------------------------------------------------------------------
           (Name, Address and Telephone Number of Person Authorized to
                       Receive Notices and Communications)


                               September 13, 1999
- --------------------------------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)


If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  which is the subject of this  Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box [ ].

Check the following box if a fee is being paid with the statement [ ]. (A fee is
not required only if the reporting person:  (1) has a previous statement on file
reporting  beneficial  ownership  of more  than  five  percent  of the  class of
securities  described  in Item 1;  and (2) has  filed  no  amendment  subsequent
thereto reporting beneficial ownership of five percent or less of such class.)
(See Rule 13d-7.)

Note: Six copies of this statement, including all exhibits, should be filed with
the Commission. See Rule 13d-1(a) for other parties to whom copies are to be
sent.

*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for  any  subsequent   amendment   containing   information  which  would  alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).


                                                                          Page 1

<PAGE>

                                  SCHEDULE 13D

CUSIP NO. 03672W-100                                           Page 2 of 6 Pages


This  Amendment No. 2 further amends and  supplements  the Statement on Schedule
13D  electronically  filed with the  Securities  and  Exchange  Commission  (the
"Commission")  on May 17, 1996 (the "Initial  Statement") by SmithKline  Beecham
Biologicals Manufacturing s.a. and amended on June 5, 1996.

The  undersigned  hereby  amends and  supplements  Items 5 and 6 of the  Initial
Statement by the following  information  (capitalized  terms used herein without
definition shall have the same meaning as set forth in the Initial Statement).










                                                                          Page 2

<PAGE>

                                  SCHEDULE 13D

CUSIP NO. 03672W-100                                           Page 3 of 6 Pages

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

1   NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      SmithKline Beecham Biologicals Manufacturing s.a.

- --------------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                               (a) [ ]
                                                               (b) [ ]
- --------------------------------------------------------------------------------
3   SEC USE ONLY

- --------------------------------------------------------------------------------
4   SOURCE OF FUNDS*

      WC
- --------------------------------------------------------------------------------
5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
    TO ITEMS 2(D) OR 2(E)                                             [ ]

- --------------------------------------------------------------------------------
6   CITIZENSHIP OR PLACE OF ORGANIZATION

      Belgium
- --------------------------------------------------------------------------------
                7   SOLE VOTING POWER
  NUMBER OF
   SHARES               8,327,222
BENEFICIALLY
  OWNED BY      -------------------------------------------------
    EACH        8   SHARED VOTING POWER
  REPORTING
   PERSON               None
    WITH
                -------------------------------------------------
                9   SOLE DISPOSITIVE POWER

                        8,327,222
- -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER

                        None
- --------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      8,327,222
- --------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
     CERTAIN SHARES*                                               [ ]

- --------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      20.76%
- --------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

      CO
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

                                                                          Page 3

<PAGE>

                                                               Page 4 of 6 Pages



Item 1.  Security and Issuer.



Item 2.  Identity and Background.



Item 3.  Source and Amount of Funds or Other Consideration.



Item 4.  Purpose of Transaction.










                                                                          Page 4

<PAGE>

                                                               Page 5 of 6 Pages


Item 5.  Interest in Securities of the Issuer.

       (a)  Amount and Percent Beneficially Owned

            Registered Name             Class        No. of Shares    Percent

            SmithKline Beecham
            Biologicals
            Manufacturing s.a.       Common Stock     8,327,222      20.76%


       (b)  Power to Vote and Dispose of Shares

                SBBM has sole voting and investment power to vote and to dispose
of all the shares of Common Stock identified in subparagraph (a) above.

       (c)  Transactions in the Class of Securities

                On September  13, 1999,  SBBM  exchanged  262.5 shares of common
stock of MHVI owned by it for  3,595,264  shares of Common Stock  identified  in
subparagraph  (a) above  pursuant  to the terms and  conditions  of an  Exchange
Option  Agreement  dated May 6, 1996 between SBBM and Issuer.  On September  13,
1999,  SBBM's  Warrant dated May 6, 1996 to purchase  shares of common Stock was
amended and  restated  to,  among other  things,  change the number of shares of
Common Stock  purchasable  thereunder to 3,865,769,  with an additional  866,189
shares of Common  Stock  purchasable  thereunder  if  Issuer  is  provided  with
$666,667 in research and development funding prior to October 1, 1999.

       (d)  Right to Receive or Power to Direct the Receipt of  Dividends  from,
            or Proceeds from the Sale of, such Securities

            None.


Item 6.     Contracts, Arrangements, Understandings or Relationship with respect
            to Securities of the Issuer.

                  Pursuant to the terms of an Omnibus Agreement  effective as of
September 1, 1999, the  transactions  described in Item 5(c) were effected,  the
Exchange  Option  Agreement was cancelled and the Stock  Purchase  Agreement was
cancelled.  Under the Omnibus  Agreement,  Issuer retains a right of first offer
originally granted in the Stock Purchase Agreement with respect to certain sales
by SBBM of shares of Common Stock.


Item 7.  Materials to be Filed as Exhibits.

            Exhibit 1.  Omnibus  Agreement  effective  as of  September 1, 1999.
            Exhibit 2.  Amended and Restated Warrant  effective as of
                        September 1, 1999.


                                                                          Page 5

<PAGE>

                                                               Page 6 of 6 Pages

                                    SIGNATURE

              After  reasonable  inquiry  and to the  best of my  knowledge  and
belief,  the  undersigned  certifies  that  the  information  set  forth  in the
Statement is true, correct and complete.



                               SMITHKLINE BEECHAM BIOLOGICALS MANUFACTURING S.A.


                               By:/s/ Jean Stephenne
                                  ------------------------------
                                  Jean Stephenne
                                  President, General Manager



DATED:  September 24, 1999












                                                                          Page 6



                               OMNIBUS AGREEMENT

              This OMNIBUS  AGREEMENT  dated  September 13, 1999 is by and among
SmithKline Beecham  Biologicals  Manufacturing  s.a., a Belgian corporation ("SB
Bio"),SmithKline Beecham plc, an English corporation ("SB plc"), Antex Biologics
Inc., a Delaware  corporation  formerly  known as Microcarb  Inc.  ("Antex") and
Microcarb  Human Vaccines Inc., a Delaware  corporation  ("MCHV").  This OMNIBUS
AGREEMENT shall be effective as of September 1, 1999 (the "Effective Date").

                                   WITNESSETH:

              WHEREAS,  SmithKline  Beecham  Corporation,  MCHV and  Antex  were
parties to a Research and Development,  Research  Support and License  Agreement
dated  May 6,  1996  (the  "Original  License  Agreement")  that was  terminated
effective as of September 1, 1999;

              WHEREAS,  SB Bio,  Antex and MCHV are parties to a Stock  Purchase
Agreement dated May 6, 1996 (the "Stock Purchase  Agreement") pursuant to which,
among other things,  SB Bio acquired 262.5 shares of the common stock, par value
$.01 per share,  of MCHV (the "MCHV  Common  Stock")  and Antex  acquired  737.5
shares of the MCHV Common Stock;

              WHEREAS,  SB Bio, Antex and MCHV are parties to an Exchange Option
Agreement dated May 6, 1996 (the "Exchange Option Agreement") pursuant to which,
among other things, Antex granted SB Bio an option to exchange its shares of the
MCHV

<PAGE>

Common Stock for shares of the common  stock,  par value $.01 per share of Antex
(the "Common Stock");

              WHEREAS,  SB Bio,  Antex and MCHV are  parties  to a  Stockholders
Agreement dated May 6, 1996 (the "Stockholders Agreement") which provides, among
other things, for the corporate governance of MCHV;

              WHEREAS,  Antex and SB Bio are  parties to a Warrant  dated May 6,
1996  (the  "Warrant")  pursuant  to which  Antex  granted  SB Bio the  right to
purchase certain shares of the Common Stock;

              WHEREAS,  Antex and SB Bio are  parties to a  Registration  Rights
Agreement dated May 6, 1996 (the "Registration  Rights  Agreement")  pursuant to
which Antex  granted SB Bio certain  rights to  register  certain  shares of the
Common Stock owned by SB Bio following its exercise of the Warrant; and

              WHEREAS,  the  parties  hereto  desire  to  (i)  enter  into a new
research and development,  research support and license agreement (ii) terminate
the Stock Purchase Agreement (other than Sections 11.8, 11.9 and 11.10 thereof);
(iii)  exchange  262.5 shares of MCHV Common Stock owned by SB Bio for 3,595,264
shares of the  Common  Stock  pursuant  to the  Exchange  Option  Agreement  and
terminate the Exchange  Option  Agreement;  (iv) merge MCHV with and into Antex;
(v) terminate the  Stockholders  Agreement;  (vi) amend and restate the Warrant;
(vii) amend and restate the Registration Rights Agreement; and (viii) provide SB
Bio with visitation rights for meetings of the Board of Directors of Antex.

                                       2

<PAGE>


              NOW,  THEREFORE,  in  consideration  of  the  premises  and of the
representations,  warranties and covenants which are to be made and performed by
the  respective  parties  hereto,  the parties  hereto,  intending to be legally
bound, agree as follows.


                                    Article I

                       Entrance into New License Agreement


             Section 1.1. Entrance into New License  Agreement.  Contemporaneous
with the execution and delivery of this Agreement by all of the parties  hereto,
SB plc and Antex  shall  execute  and deliver a new  Research  and  Development,
Research Support and License Agreement (the "New License  Agreement") in form of
Exhibit A attached hereto.


                                   Article II

                    Termination of Stock Purchase Agreement

             Section   2.1.    Termination   of   Stock   Purchase    Agreement.
Contemporaneous  with the execution and delivery of this Agreement by all of the
parties  hereto,  the Stock Purchase  Agreement  shall be terminated;  provided,
however,  that the  provisions  of  Sections  11.8,  11.9 and 11.10  thereof are
restated herein and shall continue in full force and effect. Sections 11.8, 11.9
and 11.10 provide as follows:

             Section 11.8 Standstill Obligations. For a period of ten (10) years
from May 6, 1996, except with the prior consent of Antex,  which consent may not
be unreasonably  withheld,  SB Bio and its Affiliates,  as defined below,  shall
not,  directly or indirectly,  acquire

                                       3

<PAGE>

any Equity  Securities,  as defined  below  (except by way of (i) stock  splits,
stock  dividends or other  distributions  or offerings  made  available to other
holders of Common  Stock  generally,  or (ii) stock  options,  warrants or other
rights to purchase  Common Stock approved by the Board of Directors of Antex) if
the  effect  of such  acquisition  would be to  increase  the  total  percentage
interest of SB Bio and its  Affiliates,  as defined  below,  in any class of the
Equity  Securities  to more than  twenty-eight  percent  (28%)  (the  "Threshold
Percentage")  of the  then  outstanding  shares  of  any  class  of  the  Equity
Securities; provided that:

                  (a) SB Bio may acquire Equity Securities without regard to the
limitations set forth above if any of the following events shall occur:

                         (i) If a bona fide tender or exchange  offer is made by
any Person, as defined below, or 13D Group, as defined
below  (other than an  Affiliate  of SB Bio) to acquire  shares of Common  Stock
which,  if added to the shares of Common  Stock,  if any,  already owned by such
Person or 13D Group, would represent ownership of the then outstanding shares of
Common Stock greater than the Threshold Percentage; or

                         (ii)If it is  publicly  disclosed  or SB Bio  otherwise
learns that shares of Common Stock representing more than
twenty  percent (20%) of the then  outstanding  shares of Common Stock have been
acquired in a nonpublic  transaction  or that a bona fide offer has been made to
acquire more than twenty percent (20%) of the then outstanding  shares of Common
Stock in a  nonpublic  transaction  by any  Person or 13D Group  (other  than an
Affiliate of SB Bio).

                                       4

<PAGE>

                  (b) SB Bio shall not be  obligated to dispose of any shares of
Common Stock if the aggregate  percentage  ownership of SB Bio is increased as a
result of (i) a recapitalization of Antex, (ii) a repurchase of shares of Common
Stock by Antex or (iii) any other reason not in violation of this Agreement.

                  (c) If any event  identified  in  Section  11.8(a)(i)  or (ii)
occurs,  SB Bio shall be  permitted  to take such action and make such offers as
may be  considered  to be of the same  nature  and type of  action  or offer and
directed  to the same  Person or Persons  and for the same  resulting  number of
shares as that which is being taken by such Person or 13D Group.  In  proceeding
with any action or offer  permitted  under this  Section  11.8,  SB Bio shall be
permitted to offer more favorable terms such as price, cash versus securities or
other such terms as may be consistent  with an offer of the same nature and type
of consideration as that which is being proposed by such Person or 13D Group.

                  (d) In the event that SB Bio or an Affiliate sells, assigns or
otherwise  transfers five percent (5%) or more of the then outstanding shares of
Common  Stock,  or sells,  assigns or otherwise  transfers  any shares of Common
Stock to a Person to whom SB Bio or an Affiliate has previously  sold,  assigned
or transferred any shares of Common Stock,  or to any Person,  so that upon such
sale,  assignment or transfer,  such Person owns in the  aggregate  five percent
(5%) or more of the then outstanding shares of Common Stock at a price per share
of Common Stock which is greater than the sum of (a) $.37 and (b) the product of
(i) the number of months  from May 6, 1996 to the date of such sale,  assignment
or other  transfer  pursuant to Section  11.9(c) and (ii) $.37 and (iii)  .0167,
than

                                       5

<PAGE>

the  standstill  obligations of this Section 11.8 shall be binding upon the
Person  who  purchases  such  shares.  Except  as set  forth in the  immediately
preceding sentence, the standstill obligations of this Section 11.8(d) shall not
be binding upon any Person who  purchases  shares of Common Stock from SB Bio or
an Affiliate.

             Section 11.9. Transfer by SB Bio of Shares of Common Stock.

                 (a) SB Bio may sell,  assign or  otherwise  transfer  shares of
Common Stock from time to time owned by it to  Affiliates  without  restriction.
Notwithstanding  the preceding  sentence,  neither SB Bio nor its Affiliates may
sell,  assign or otherwise  transfer shares of Common Stock except in accordance
with the terms of this Agreement.

                 (b) Except as otherwise provided in Section 11.9(c), SB Bio may
sell,  assign or  otherwise  transfer  shares of Common  Stock from time to time
owned  by it  which  have  been  registered  with the  Securities  and  Exchange
Commission without restriction. Except as otherwise provided in Section 11.9(c),
SB Bio may sell,  assign or otherwise  transfer shares of Common Stock from time
to time  owned by it which  have not been  registered  with the  Securities  and
Exchange  Commission without restriction other than the requirements of Rule 144
promulgated  under the  Securities  Act of 1933, as from time to time in effect,
including the volume  limitations  under Rule 144  irrespective  of whether Rule
144(k) applies.

                 (c) If at any time prior to May 6, 2006 SB Bio proposes to sell
five percent (5%) or more of the then outstanding shares of Common Stock, SB Bio
shall give written notice (the "Transfer Notice") to Antex specifying the number
of shares of Common Stock

                                        6

<PAGE>

that SB Bio desires to transfer (the "Transfer Stock") and the price at which SB
Bio is offering to sell the Transfer Stock (the "Offering Price").  The Transfer
Notice  shall  constitute  an offer to sell all,  but not less than all,  of the
Transfer  Stock to Antex (or its designee) at the Offering Price with payment in
immediately available funds. Antex or its designee shall have a period of thirty
(30)  calendar days to accept SB Bio's offer to sell all, but not less than all,
of the Transfer Stock and an additional period of sixty (60) calendar days after
the date that it accepts SB Bio's  offer  contained  in the  Transfer  Notice to
complete the  purchase of all,  but not less than all, of the Transfer  Stock at
the Offering Price. If Antex or its designee does not accept the offer contained
in the Transfer Notice without modification within the time period prescribed in
the preceding  sentence,  declines the offer contained in the Transfer Notice or
accepts the offer  contained in the Transfer  Notice without  modification,  but
fails to complete  the  purchase of all of the  Transfer  Stock  within the time
period  specified in the preceding  sentence,  SB Bio may sell any or all of the
Transfer  Stock at an offering  price which is not less than the Offering  Price
for a period of one (1) year from the date of the Transfer Notice. If SB Bio has
not sold the Transfer Stock within such one (1) year period from the date of the
Transfer Notice,  SB Bio must comply with the provisions of this Section 11.9(c)
prior to  consummating  any sale of such Transfer  Stock.  If SB Bio proposes to
sell any of the Transfer  Stock which  constitutes  five percent (5%) or more of
the then outstanding  shares of Common Stock within such one (1) year period for
a price which is less than the Offering Price specified in the Transfer  Notice,
SB Bio  must  comply  with  the  provisions  of this  Section  11.9(c)  prior to
consummating any sale of such Transfer Stock.

                                       7

<PAGE>

             Section  11.10   Non-Solicitation   of  Employees.   For  a  period
commencing  on the date of this  Agreement  and ending  two (2) years  after the
expiration of the New License Agreement (the "Non-Solicitation  Period"), SB Bio
and Antex each agree  that  neither  they nor their  Affiliates  shall  solicit,
without the prior consent of the other party,  for employment any individual who
is employed by such other party  during the  Non-Solicitation  Period so long as
such individual is employed by the other party.

             Section  2.2  Definitions.  For  purposes  of  thisArticle  II, the
following terms shall have the following meanings:

              (i) "13D Group" means any group of Persons  formed for the purpose
of acquiring,  holding,  voting or disposing of Common Stock (or any other class
of the Equity Securities) which would be required under the Exchange Act to file
a statement on Schedule 13D with the  Securities  and Exchange  Commission  as a
"person"  within the  meaning of Section  13(d)(3) of the  Exchange  Act if such
group  beneficially  owned sufficient  securities to require such a filing under
the Exchange Act.

              (ii)"Affiliate" of another Person means a Person which directly or
indirectly owns, is owned by or is under common ownership with another Person to
the  extent  of at least  fifty  percent  (50%) of the  equity  (or such  lesser
percentage which is the maximum allowed to be owned by a foreign  corporation in
a particular  jurisdiction) having the power to vote on or direct the affairs of
the entity and any Person  actually  controlled by,  controlling or under common
control with another Person.

                                       8

<PAGE>

              (iii)  "Equity  Securities"  shall mean the  Common  Stock and the
Preferred Stock, par value $.01 per share, of Antex.

              (iv) "Exchange Act" means the Securities  Exchange Act of 1934, as
amended, and the rules and regulations  promulgated thereunder by the Securities
and Exchange Commission.

              (v) "Person"  means and includes an individual,  a partnership,  a
joint venture, a corporation or trust, an unincorporated  organization,  a group
or a government or other department or agency thereof.

                                  Article III

               Exchange of MCHV Common Stock for Common Stock;
               Termination of Exchange Option and Stockholders Agreement;
               Merger of MCHV with and into Antex

              Section  3.1.  Exchange  of MCHV  Common  Stock for Common  Stock.
Contemporaneous  with the execution and delivery of this Agreement by all of the
parties hereto, (i) SB Bio shall deliver to Antex the original stock certificate
representing  262.5 shares of MCHV Common Stock  registered in SB Bio's name and
(ii)  Antex  shall  deliver  to  SB  Bio  a  duly  executed  stock   certificate
representing  3,595,264  shares of the Common Stock registered in SB Bio's name,
which exchange  shall be completed  pursuant to the Exchange  Option  Agreement.
Following the completion of such exchange,  the Exchange Option  Agreement shall
be terminated, cancelled and of no further force or effect.

                                       9

<PAGE>

              Section   3.2.   Termination   of  the   Stockholders   Agreement.
Contemporaneous  with the execution and delivery of this Agreement by all of the
parties hereto, the Stockholders Agreement shall be terminated, cancelled and of
no further force or effect.

              Section 3.3.  Merger of MCHV with and into Antex.  Contemporaneous
with the execution and delivery of this Agreement by all of the parties  hereto,
Antex and MCHV shall  execute and file with the Secretary of State of Delaware a
Certificate of Merger in the form of Exhibit B attached hereto.


                                   Article IV

                            Amendment of the Warrant

              Section 4.1.  Amendment of the Warrant.  Contemporaneous  with the
execution and delivery of this  Agreement by all of the parties  hereto,  (i) SB
Bio shall deliver to Antex the original  Warrant and (ii) Antex shall deliver to
SB Bio a duly  executed  Amended and  Restated  Warrant in the form of Exhibit C
attached hereto.



                                   Article V

                 Amendment of the Registration Rights Agreement

              Section  5.1.  Amendment  of the  Registration  Rights  Agreement.
Contemporaneous  with the execution and delivery of this Agreement by all of the
parties  hereto,  SB Bio and Antex  shall  execute and deliver to one another an
amended and  restated  Registration  Rights  Agreement  in the form of Exhibit D
attached hereto.

                                       10

<PAGE>

                                   Article VI

                             Board Visitation Rights

              Section 6.1. Board Visitation Rights. For so long as SB Bio or any
or its  Affiliates  own in the  aggregate  at  least  ten  percent  (10%) of the
outstanding  shares of Common Stock (such outstanding  shares calculated without
taking  into  account  any shares of Common  Stock  issuable  upon  exercise  or
conversion  of any  exercisable  or  convertible  securities),  Antex  shall (i)
provide  SB Bio  notice of each  meeting  of  Antex's  Board of  Directors  (the
"Board") at the same time and in the same  manner as it provides  notice of such
meeting  to any other  member of the  Board;  (ii)  provide  SB Bio all  written
materials  provided  to members of the Board in  anticipation  of, and at,  each
meeting of the Board at the same time and in the same manner as it provides such
written  materials  to any  other  member  of the  Board;  and  (iii)  allow one
representative of SB Bio (or any of its Affiliates)(the "SB Bio Representative")
to attend in a non-voting, observer capacity each meeting of the Board in person
or, to the extent the meeting of the Board is to be held by  teleconference,  to
attend such meeting by telephone  conference  call.  Each SB Bio  Representative
must be approved by the Board of Directors of Antex in advance of any meeting of
the Board, such approval not to be unreasonably  withheld or delayed;  provided,
however,  that at each annual  meeting of  shareholders  of Antex,  the Board of
Directors  shall  pre-approve  three (3) acceptable SB Bio  Representatives  who
shall be deemed approved by the Board of Directors until the next annual meeting
of shareholders of Antex. Until the next annual meeting of shareholders of Antex
(expected  to be in June 2000),  the  approved SB Bio  Representatives  shall be
Oliver Boucher, Moncef Slaoui and Jean Stephenne, with

                                       11

<PAGE>

Oliver Boucher designated as the primary SB Bio Representative.  All information
which is received by SB Bio in connection  with the exercise of its rights under
this  Section  6.1 shall be held by it in  accordance  with the  confidentiality
provisions of the New License Agreement.  Notwithstanding  the foregoing,  it is
understood and agreed that Antex reserves the right to withhold any  information
and to exclude the SB Bio Representative  from any meeting or portion thereof to
the extent  access to such  information  or attendance at such meeting (i) would
adversely affect the attorney-client  privilege between Antex and its counsel or
(ii) would violate an obligation of confidentiality to a third party.

                                  Article VII

                     Representations and Warranties of Antex

              Antex represents and warrants to SB Bio and SB plc, and SB Bio and
SB plc in agreeing to consummate the transactions contemplated by this Agreement
and each of the agreements attached as exhibits to this Agreement  (collectively
the "Related  Agreements") have relied upon such representations and warranties,
that, as of the signature date of this Agreement:

              Section 7.1. Valid and Binding Agreements; Status of Common Stock.
Antex  has all  requisite  corporate  power  and  authority  and has  taken  all
necessary  corporate  action  to  enter  into  this  Agreement  and the  Related
Agreements  to  which  it  is  a  party  and  to  consummate  the   transactions
contemplated  hereby and thereby including without limitation the merger of MCHV
with and into Antex. The shares of the Common Stock delivered to SB Bio pursuant
to Section 3.1 are duly authorized, validly issued, fully paid

                                       12

<PAGE>

and  nonassessable  shares of the  Common  Stock,  free and clear of all  liens,
security  interests,  pre-emptive rights,  claims and other  encumbrances.  This
Agreement  and the Related  Agreements  to which Antex is a party have been duly
and validly  executed and delivered by Antex,  and constitute  valid and binding
agreements  of Antex,  enforceable  in accordance  with their terms,  subject to
bankruptcy,  insolvency,  reorganization  or similar laws relating to creditors'
rights generally.

              Section 7.2. Corporate Organization.

              (a) Antex is a corporation duly organized, validly existing and in
good  standing  under the laws of the State of  Delaware  and has the  requisite
power and  authority to carry on its business as currently  conducted and to own
the properties and assets it now owns.

              (b)  Antex is duly  licensed  or  qualified  to do  business  as a
foreign corporation, and is in good standing, in Maryland. The nature of Antex's
business  does not require it to be qualified  to conduct  business in any other
jurisdictions.

              (c)  The  copies  of the  certificate  of  incorporation,  and all
amendments  thereto,  of Antex as certified by the  appropriate  authorities  of
Delaware,  and the by-laws,  as amended to date,  of Antex,  as certified by its
Secretary,  which have heretofore  been delivered to SB Bio, are true,  complete
and correct  copies of the articles of  incorporation  and by-laws of Antex,  as
amended and in effect on the date hereof.

              Section 7.3. Capitalization.

                                       13

<PAGE>

              (a) The  authorized  capital  stock of Antex  consists  solely  of
95,000,000 shares of the Common Stock, of which 25,863,726 shares are issued and
outstanding,  and 5,000,000 shares of preferred stock, par value $.01 per share,
of which none are issued or outstanding.  The issued and  outstanding  shares of
the  Common  Stock  are  duly  authorized,   validly  issued,   fully  paid  and
nonassessable, and none of the issued and outstanding shares of the Common Stock
were issued in violation of the preemptive rights of any person.

              (b) Except as set forth in Section 7.3(a) and on Schedule 7.3, (i)
there  are no  shares  of  capital  stock or other  equity  securities  of Antex
outstanding,  (ii) there are no outstanding subscriptions,  options, warrants or
rights  to  purchase  or  acquire  any  equity  securities  of,  (iii) no equity
securities  of Antex are reserved  for issuance for any purpose,  and (iv) there
are no  contracts,  commitments,  agreements,  understandings,  arrangements  or
restrictions,  whether  written or oral,  to which  Antex is a party or by which
Antex is bound  relating  to any  shares of the  capital  stock or other  equity
securities of Antex, whether or not outstanding.

              Section 7.4.  Subsidiaries  and Affiliates.  Antex owns no capital
stock of any other person or has any other type of interest  (whether  ownership
or other) in any other person other than MCHV and Antex Pharma Inc. Antex is not
subject to any  obligation or  requirement  to provide funds for, or to make any
investment (in the form of a loan, capital  contribution or otherwise) to or in,
any person.

                                       14

<PAGE>


              Section 7.5. No Violation, Etc. Neither the execution and delivery
of this  Agreement or the Related  Agreements  to which Antex is a party nor the
consummation of the transactions  contemplated  hereby or thereby nor compliance
by Antex  with any of the  provisions  hereof or  thereof  will (i)  violate  or
conflict with any provisions of Antex's certificate of incorporation or by-laws,
(ii) violate or conflict with any statute,  code, ordinance,  rule,  regulation,
judgment,  order, writ, decree or injunction applicable to it, or (iii) violate,
or conflict  with,  or result in a breach in any  provision  of, or constitute a
default  (or any event  that,  with or without  due notice or lapse of time,  or
both,  would  constitute such a default) under, or result in the termination of,
accelerate the  performance  required by, or result in the creation of any lien,
security  interest,  charge or other  encumbrance  upon the 3,595,264  shares of
Common Stock received pursuant to Section 3.1 or any of the properties or assets
of Antex under any of the terms,  conditions or  provisions  of any note,  bond,
mortgage,   indenture,  deed  of  trust,  license,  lease,  agreement  or  other
instrument  or obligation of which Antex is a party or by which it or any of its
assets is bound.

              Section 7.6. Consents and Approvals. No permit, consent,  approval
or  authorization  of,  or  declaration,   filing  or  registration   with,  any
governmental  authority  is  necessary  in  connection  with the  execution  and
delivery by Antex of this  Agreement or the Related  Agreements to which it is a
party or the  consummation by Antex of the transactions  contemplated  hereby or
thereby and no consent of any third party is required to  consummate  any of the
transactions contemplated hereby or thereby.

                                       15

<PAGE>

              Section 7.7. Disclosure.  No representation or warranty made by or
on behalf of Antex  contained  in this  Agreement or the Related  Agreements  to
which it is a party,  and no  statement  contained  in the  Schedules  hereto or
thereto or any certificate or other document furnished to SB Bio pursuant to the
provisions hereof or thereof, contains or will contain any untrue statement of a
material fact or omits or will omit to state a material fact  necessary in order
to make the statements herein or therein,  in light of the  circumstances  under
which such statements are made, not misleading.

              Section 7.8. Securities and Exchange Commission  Documents.  Antex
has timely  filed with the  Securities  and  Exchange  Commission  all  material
filings (the "Commission  Documents") required to be filed by it pursuant to the
Exchange  Act and the  Securities  Act of  1933,  and the  Commission  Documents
complied in all material  respects with the Exchange Act and the  Securities Act
of 1933, and none of the Commission  Documents contain any untrue statement of a
material  fact or  omitted  to  state a  material  fact  necessary  to make  the
statements  contained  therein not  misleading.  SinceJune  30, 1999,  Antex has
conducted its business only in the ordinary course and in substantially the same
manner as  previously  conducted  and there  has not been any  material  adverse
change in the business, financial condition or prospects of Antex.

              Section 7.9. Authorization of Reserved Shares. On the date hereof,
the issuance,  sale and delivery by Antex of the Common Stock  issuable upon the
exercise of the Amended and Restated  Warrant (the "Reserved  Shares") have been
duly  authorized by all requisite  corporate  action of Antex and have been duly
reserved  for  issuance,  and when so

                                       16

<PAGE>

issued, sold, paid for and delivered in accordance with the terms of the Amended
and Restated Warrant, the Reserved Shares will be validly issued, fully paid and
nonassessable,  and not subject to any preemptive  rights of any  stockholder of
Antex.

              Section 7.10. Litigation.  There are no (a) legal,  administrative
or arbitrable claims, actions, suits,  proceedings,  investigations or inquiries
pending or threatened  by or pending or, to the  knowledge of Antex,  threatened
against Antex, and (b) judgments,  decrees,  arbitration  awards,  agreements or
orders binding upon Antex. No material  claims have been asserted  against Antex
since its  incorporation  on September  15, 1992.  Antex is not aware and has no
reason  to be  aware of any  basis  for any  claim,  action,  suit,  proceeding,
investigation or inquiry.

              Section 7.11 Intellectual Property. (a) With the exception of U.S.
Patent  No.  5,552,144  and  all   corresponding   foreign  patents  and  patent
applications  corresponding  hereto and all  continuations and divisions thereof
(the  "144Patent")  which is co-owned by Antex and the United  States of America
and certain  march-in rights of the United States of America,  Department of the
Navy with respect to Campylobacter,  and with the exception of rights granted to
Pasteur  Merieux  Serums et Vaccines S.A.  ("Pasteur")  pursuant to that certain
license  agreement  dated December 1, 1994,  Antex owns and possesses all right,
title and  interest in and to or will have  license  rights in the  Intellectual
Property  (as such  term in  defined  in the New  License  Agreement).  With the
exception of the rights  granted to Pasteur,  the march-in  rights of the United
States of America,  Department  of the Navy,  and the rights owned by the United
States  of  America  with  respect  to  the 144  Patent,  Antex  has

                                       17

<PAGE>

the sole  and  exclusive  right  to use and  license  other  persons  to use the
Intellectual  Property  and none of the  past or  present  employees,  officers,
directors or  shareholders  of Antex,  or any other Person,  has any rights with
respect thereto.  The consummation of the transactions  contemplated hereby will
not alter or impair any rights to use and license others to use the Intellectual
Property.  Antex has not  received  any notice or claim of  infringement  or any
claim challenging or questioning the validity or effectiveness of Antex's rights
in or to any of the  items of  Intellectual  Property,  and Antex is aware of no
valid basis for any such claim.  Except as noted above, Antex is not liable, nor
has it made any contract or  arrangement  whereby it may become  liable,  to any
Person  for any  royalty  or other  compensation  for use of any of the items of
Intellectual  Property.  Following  consummation  of the Merger of MCHV with and
into Antex, Antex will possess all right, title and interest in all Intellectual
Property that was at any time owned by MCHV.  When executed and  delivered,  the
New License  Agreement will effectively grant the license and other rights which
are expressly granted to SB plc therein.


                                  Article VIII

              Representations and Warranties of SB Bio and SB plc

              SB Bio and SB plc  represent  and  warrant to Antex,  and Antex in
agreeing to consummate the  transactions  contemplated by this Agreement and the
Related Agreements has relied upon such representations and warranties, that, as
of the signature date of this Agreement:

                                       18

<PAGE>

              Section  8.1.  Organization,  Standing  and  Power.  SB  Bio  is a
corporation  duly  organized  under the laws of  Belgium  and has the  requisite
corporate  power and  authority to carry on its business as now being  conducted
and to own the properties and assets it presently  owns. SB plc is a corporation
duly  organization  under the laws of the United  Kingdom and has the  requisite
corporate  power and  authority to carry on its business as now being  conducted
and to own the properties and assets it presently owns.

              Section 8.2. Valid and Binding Agreements. All necessary corporate
action  on the  part  of SB Bio and SB plc  has  been  taken  to  authorize  the
execution  and delivery of this  Agreement  and the Related  Agreements to which
they are a party, the performance of their obligations  hereunder and thereunder
and the consummation of the transactions  contemplated hereby and thereby.  This
Agreement  and the Related  Agreements  to which they are a party have been duly
and validly executed and delivered by SB Bio and SB plc and constitute valid and
binding  agreements of SB Bio and SB plc,  enforceable in accordance  with their
terms,  subject to  bankruptcy,  insolvency,  reorganization  or similar laws or
equitable principles relating to creditors' rights generally.

              Section 8.3. No  Violation.  Neither the execution and delivery of
this Agreement or the Related  Agreements to which SB Bio and SB plc are a party
nor the  consummation  of the  transactions  contemplated  hereby or thereby nor
compliance  by SB Bio and SB plc with any of the  provisions  hereof or  thereof
will (a) violate or conflict with the organizational  documents of SB Bio and SB
plc,  or (b)  violate or  conflict  with any  statute,  code,  ordinance,  rule,
regulation, judgment, order, writ, decree or injunction

                                       19

<PAGE>

applicable to SB Bio and SB plc, or (c) violate or conflict with, or result in a
breach of any of the provisions of, or constitute a default (or any event which,
with or without due notice or lapse of time, or both,  would  constitute  such a
default)  under,  or result in the termination of, or accelerate the performance
required by, or result in the creation of any lien, security interest, charge or
other encumbrance upon the stock or any of the properties or assets of SB Bio or
SB plc under any of the  terms,  conditions  or  provisions  of any note,  bond,
mortgage,   indenture,  deed  of  trust,  license,  lease,  agreement  or  other
instrument of which SB Bio or SB plc is a party or by which they or any of their
assets are bound.

              Section 8.4. Consents and Approvals. No permit, consent,  approval
or  authorization  of,  or  declaration,   filing  or  registration   with,  any
governmental  authority  is  necessary  in  connection  with the  execution  and
delivery of this  Agreement or the Related  Agreements to which they are a party
by SB Bio or SB plc or the  consummation by SB Bio or SB plc of the transactions
contemplated  hereby or thereby and no consent of any third party is required to
consummate any of the transactions contemplated hereby or thereby.

              Section 8.5. Investor Status.  SB Bio is an "accredited  investor"
as such term is defined in any of  paragraphs  (1) through (3), (7), (8) or Rule
501(a) under the Securities Act of 1933, as amended.


                                   Article IX

                                  Miscellaneous

              Section 9.1. Notices.  All notices,  requests,  consents and other
communications  hereunder  shall be in writing and may be  delivered  personally
(including  by  courier  or

                                       20

<PAGE>

nationally  recognized  courier),  by first class  registered or certified  mail
(return  receipt  requested),  postage  prepaid,  or by facsimile  (with written
confirmation  of receipt)  addressed  to the  following  addresses  or facsimile
numbers or to other such  addresses or facsimile  numbers as may be furnished in
writing by one party to the others:

              (a)          if to Antex:

                           Antex Biologics Inc.
                           300 Professional Drive
                           Gaithersburg, MD  20879, USA
                           Attention:  Chief Executive Officer
                           Facsimile:  (301) 590-1252

                           with a copy to:

                           Covington & Burling
                           1201 Pennsylvania Avenue, N.W.
                           Washington, DC  20004-6000, USA
                           Attention:  Alfred H. Moses, Esq.
                           Facsimile:  (202) 778-5196

              (b)          if to SB Bio:

                           SmithKline Beecham Biologicals Manufacturing s.a.
                           Rue de L'Institut 89
                           B-1330 Rixensart
                           Belgium
                           Attention:  President, General Manager
                           Facsimile:  011-32-2-656-8026

                           if to SB plc:

                           SmithKline Beecham plc
                           c/o SmithKline Beecham Corporation
                           One Franklin Plaza
                           P.O. Box 7929
                           Philadelphia, PA  19101-7929, USA
                           Attention:  Edgar B. Cale III, Esq.
                           Facsimile:  (215) 751-3935


                                       21

<PAGE>

                           with a copy to:

                           Dickstein Shapiro Morin & Oshinsky LLP
                           2101 L Street, N.W.
                           Washington, D.C.  20037, USA
                           Attention:  Neil Lefkowitz, Esq.
                           Facsimile:  (202) 887-0689

Any such notice or communication  shall be presumed to have been received (i) in
the case of personal  delivery or  facsimile  transmission,  on the date of such
delivery and (ii) in the case of nationally-recognized  courier, on the business
day after the date sent.

              Section 9.2.  Governing Law. This Agreement  shall be governed by,
and construed in  accordance  with,  the laws of the State of Maryland,  without
regard to such jurisdiction's conflicts of laws principles.

              Section 9.3.  Modification;  Waiver.  This Agreement  shall not be
altered or otherwise  amended except pursuant to an instrument in writing signed
by SB Bio, SB plc and Antex.  Any party may waive any  misrepresentation  by any
other party,  or any breach of warranty by, or failure to perform any  covenant,
obligation  or agreement  of, any other party,  provided  that mere  inaction or
failure  to  exercise  any right,  remedy or option  under  this  Agreement,  or
delaying in exercising the same, will not operate as nor shall be construed as a
waiver,  and no waiver will be effective unless set forth in writing and only to
the extent specifically stated therein.

              Section  9.4.  Entire  Agreement.   This  Agreement,  the  Related
Agreements,  the  Schedules  and  Exhibits  hereto and any other  agreements  or
certificates  delivered  pursuant

                                       22

<PAGE>

hereto constitute the entire agreement of the parties hereto with respect to the
matters   contemplated  hereby  and  supersede  all  previous  written  or  oral
negotiations, commitments, representations and agreements.

              Section 9.5.  Assignment;  Successors and Assigns.  This Agreement
may not be assigned by any party, without the prior written consent of the other
parties;  provided,  however,  that  SB Bio  and SB plc  may  each  assign  this
Agreement and any of their rights hereunder to any of their affiliates or to any
corporation  with which it may merge or consolidate or sell all or substantially
all of their respective  assets without any prior consent;  and Antex may assign
this  Agreement to any  corporation  with which Antex may merge,  consolidate or
sell all or  substantially  all of its assets  without  any prior  consent.  All
covenants,  representations,  warranties and agreements of the parties contained
herein  shall be  binding  upon and  inure to the  benefit  of their  respective
successors and permitted assigns.

              Section 9.6. Public  Announcements.  No public announcement of the
transactions  contemplated  hereby or of the terms  hereof at any time  shall be
made by any party without the prior written consent of the other parties, not to
be unreasonably withheld or delayed,  except to the extent as may be required by
law in the  opinion  of  counsel to SB plc or counsel to Antex and in the latter
case,  only  upon at least  five (5) days  prior  notification  of the  proposed
announcement to the other party.

              Section 9.7.  Expenses.  The parties  shall each pay all costs and
expenses  incurred by them or on their behalf in connection with the preparation
of this Agreement and the

                                       23

<PAGE>

transactions  contemplated  hereby,  including  without  limitation,   fees  and
expenses of their own attorneys, accountants and advisors.

              Section 9.8.  Severability.  The  provisions of this Agreement are
severable,  and in the event that any one or more  provisions are deemed illegal
or  unenforceable,  the  remaining  provisions  shall  remain in full  force and
effect.

              Section  9.9.  No  Third  Party  Beneficiary.  This  Agreement  is
intended and agreed to be solely for the benefit of the parties  hereto,  and no
third  party shall  accrue any  benefit,  claim or right of any kind  whatsoever
pursuant to, under, by or through this Agreement.

              Section  9.10.  Opinion  of  Counsel  to  Antex.  Within  five (5)
business  days of the  execution  and  delivery of this  Agreement by all of the
parties hereto, Covington & Burling, counsel to Antex, shall deliver its opinion
addressed  to SB Bio  concerning  (i)  the  transactions  contemplated  by  this
Agreement  and (ii) the  issuance of shares of the Common  Stock and the Amended
and  Restated  Warrant  to SB Bio,  in the form set forth on  Exhibit E attached
hereto.

              Section  9.11.  Execution in  Counterpart.  This  Agreement may be
executed in two or more counterparts,  each of which shall be deemed an original
but all of which shall constitute one and the same instrument.

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

                                       24

<PAGE>

              IN WITNESS  WHEREOF,  the parties have executed this  Agreement on
the date first above written.


                                        MicroCarb Human Vaccines Inc.



                                        By:  /s/ V.M. Esposito
                                           ------------------------------------
                                           Name:  V.M. Esposito
                                           Title:  President



                                        Antex Biologics Inc.



                                        By:  /s/ V.M. Esposito
                                           ------------------------------------
                                           Name:  V.M. Esposito
                                           Title:  Chairman & CEO



                                        SmithKline Beecham Biologicals
                                          Manufacturing s.a.



                                        By:  /s/ Jean Stephenne
                                           ------------------------------------
                                           Name:  Jean Stephenne
                                           Title:  President, General Manager



                                        SmithKline Beecham plc



                                        By:  /s/ Jean Stephenne
                                           ------------------------------------
                                           Name:  Jean Stephenne
                                           Title:  Attorney-In-Fact



          This  Amended  and  Restated  Warrant  and the Common  Stock
          issuable  upon exercise  hereof have not been  registered or
          qualified  for sale  under the  Securities  Act of 1933,  as
          amended,  or any state securities law and may not be sold or
          transferred  in  the  absence  of  such  registration  or an
          exemption  therefrom  under  said Act or any such state laws
          which may be applicable.

No. of Shares:  3,865,769  (which  number is subject to  adjustment  as provided
herein)



                          AMENDED AND RESTATED WARRANT

                           To Purchase Common Stock of

                              ANTEX BIOLOGICS INC.

              WHEREAS,  in  connection  with the  execution and delivery of that
certain  Research and Development,  Research Support and License  Agreement (the
"Original  License  Agreement")  dated May 6, 1996, by and among MicroCarb Human
Vaccines,  Inc.,  MicroCarb,  Inc. (the former name of Antex Biologics Inc.) and
SmithKline  Beecham  Corporation,  MicroCarb,  Inc. granted  SmithKline  Beecham
Biologicals  Manufacturing s.a. a warrant (the "Original  Warrant") dated May 6,
1996 to purchase  certain shares of its common stock,  $.01 par value per share;
and

              WHEREAS,  MicroCarb Human Vaccines, Inc., Antex Biologics Inc. and
SmithKline Beecham Corporation have terminated the Original License Agreement on
the date hereof and, in connection with the termination of the Original  License
Agreement, Antex Biologics Inc. has entered into a new research and development,
research  support and  license  agreement  (the "New  License  Agreement")  with
SmithKline Beecham plc, and has also agreed in a separate omnibus agreement (the
"Omnibus  Agreement")  dated  the date  hereof  between  Antex  Biologics  Inc.,
MicroCarb Human Vaccines, Inc. and SmithKline Beecham Biologicals  Manufacturing
s.a. to among other things  amend and restate the Original  Warrant as set forth
herein.

              THIS  AMENDED  AND  RESTATED  WARRANT  CERTIFIES  THAT,  for value
received,   the  registered  holder  hereof,   SmithKline  Beecham   Biologicals
Manufacturing  s.a., a Belgian  company,  whose address is Rue de L'Institut 89,
B-1330 Rixensart Belgium, or its successors and assigns, is entitled to purchase
from ANTEX BIOLOGICS  INC., a corporation  organized and existing under the laws
of Delaware,  3,865,769  shares of the Common Stock (as hereinafter  defined) at
the Basic Purchase Price (as hereinafter  defined) at any time on or before 5:00
p.m.,  Eastern  Standard  time  on  September  1,  2003.   Notwithstanding   the
immediately  preceding  sentence,  the  number  of shares  of the  Common  Stock
purchasable hereunder shall be cumulatively increased by the


<PAGE>

following  number of shares of the Common Stock in the  following  circumstance:
the  number  of  shares  of the  Common  Stock  purchasable  hereunder  shall be
immediately  increased by an  additional  866,189  shares of the Common Stock if
SmithKline Beecham Corporation  provides Antex Biologics Inc. an additional U.S.
$666,667 in research and development funding under the Amended License Agreement
on or  before  October  1,  1999.  The  number of  shares  of the  Common  Stock
purchasable  hereunder  and the Basic  Purchase  Price  therefor  are subject to
further adjustment as hereinafter provided in Section 5.

              Section 1.  Definitions.  For all  purposes  of this  Amended  and
Restated Warrant, the following terms shall have the meanings indicated:

              "Basic  Purchase  Price"  shall  mean the price of U.S.  $0.37 per
share of the Common  Stock,  at which  price the  registered  holder  hereof may
exercise this Amended and Restated  Warrant prior to any adjustments  being made
as provided in Section 5.  Notwithstanding  the immediately  preceding sentence,
the Basic Purchase Price for the 866,189  additional  shares of the Common Stock
purchasable hereunder if SmithKline Beecham Corporation provides Antex Biologics
Inc. an additional U.S.  $666,667 in research and development  funding under the
New License  Agreement on or before October 1, 1999 shall be the Market Price of
the Common  Stock as of October 1, 1999 prior to any  adjustments  being made as
provided in Section 5.

              "Business Day" shall mean any day except a Saturday, a Sunday, or
a legal  holiday in the City of New York other than a legal holiday on which the
New York Stock Exchange is open for trading on a regular basis.

              "Commission" shall mean the Securities and Exchange Commission and
any  other  similar  or  successor   agency  of  the  federal   government  then
administering the Securities Act or the Exchange Act.

              "Common  Stock"  shall mean and include the  Company's  authorized
common  stock,  $.01 par value per  share,  as  constituted  on the date of this
Amended and  Restated  Warrant,  and shall also include any class of the capital
stock of the Company hereafter  authorized which shall neither (i) be limited to
a fixed sum or a percentage of par value in respect of the rights of the holders
thereof to receive  dividends and to participate in the  distribution  of assets
upon the voluntary or involuntary liquidation,  dissolution or winding-up of the
Company, nor (ii) be subject at any time to redemption by the Company.

              "Company" shall mean Antex Biologics Inc. and its successors.

              "Convertible  Securities"  shall  mean  any  stock  or  securities
convertible into or exchangeable for shares of the Common Stock.

              "Exchange Act" shall mean the Securities Exchange Act of 1934, and
any similar or successor  federal statute,  and the rules and regulations of the
Commission thereunder, all as the same shall be in effect at the time.

              "Market  Price" shall mean, as of any date, 5% of the sum for each
of the 20  consecutive  Trading  Days  immediately  prior to such  date,  of the
average of either:

                                       2

<PAGE>

              (i) the high and low  sales  prices  of the  Common  Stock on such
Trading Day on the New York Stock  Exchange  or;

              (ii) if the Common  Stock  shall not on such  Trading  Day then be
listed  on such  Exchange,  such  high and low  sales  prices  on the  principal
(determined  by the  highest  volume  of  the  Common  Stock  during  the  month
immediately  preceding  the month in which  occurs  the date as of which  Market
Price is being  determined)  national  securities  exchange  (as  defined in the
Exchange Act) on which the Common Stock may then be listed, or;

              (iii) if there  shall have been no sales on any such  Exchange  or
exchange on any such Trading  Day, the bid and asked prices on such  Exchange or
exchange at the end of such Trading Day, or;

              (iv) if the  Common  Stock  shall  not be so  listed  on any  such
Trading Day, the  representative bid and asked prices at the end of such Trading
Day in the  over-the-counter  market as reported by the National  Association of
Securities Dealers Automated Quotations System ("Nasdaq"), or;

              (v) if there be no such representative  prices reported by Nasdaq,
the bid and asked prices at the end of such Trading Day in the  over-the-counter
market.

For purposes of  determining  Market Price,  the term "Trading Day" shall mean a
Business  Day on which  the  amount  greater  than zero can be  calculated  with
respect to the Common  Stock under any one or more of the  foregoing  categories
(i) , (ii), (iii), (iv) or (v), and the end of the Trading Day, for the purposes
of categories (iv) and (v), shall mean the exact time at which trading shall end
on the New York Stock Exchange.

              "Person" shall mean any  individual,  partnership,  joint venture,
limited liability company, unincorporated organization, government or department
or agency of a government.

              "Purchase  Price"  shall mean as of any date,  the Basic  Purchase
Price,  as the  same  has  been  adjusted  from  time  to time  pursuant  to the
provisions of Section 5.

              "Registrable  Securities"  shall mean the Warrants and the Warrant
Shares.

              "Securities  Act" shall mean the  Securities  Act of 1933, and any
similar or  successor  federal  statute,  and the rules and  regulations  of the
Commission thereunder, all as the same shall be in effect at the time.

              "Warrantholders"  shall mean, as of any date, the then  registered
holders of the Warrants and the then registered holders of the Warrant Shares.

              "Warrants"  shall mean this Amended and  Restated  Warrant and any
other warrant of the Company hereafter issued to SmithKline Beecham  Biologicals
Manufacturing  s.a.,  including all  amendments  thereto,  and together with all
Warrants issued in exchange, transfer or replacement of any thereof.

                                       3

<PAGE>

              "Warrant  Shares"  shall  mean  all  shares  of the  Common  Stock
purchased or  purchasable  by the  registered  holders of the Warrants  upon the
exercise thereof pursuant to Section 4 thereof.

              All terms used in this Amended and Restated  Warrant which are not
defined in this  Section 1 have the  meanings  respectively  set forth  therefor
elsewhere in this Amended and Restated Warrant.

              Section 2.  Ownership of this Amended and  Restated  Warrant.  The
Company may deem and treat the Person in whose name this  Amended  and  Restated
Warrant  is  registered  as the  holder and owner  hereof,  notwithstanding  any
notations of ownership or writing  hereon made by anyone other than the Company,
for all purposes and shall not be affected by any notice to the contrary,  until
presentation of this Amended and Restated  Warrant for  registration or transfer
as provided in Section 3. The Company shall maintain, at its office or agency at
300 Professional Drive, Gaithersburg, Maryland 20879 (or at such other office or
agency of the Company as the Company shall designate from time to time by notice
to the registered holder of this Amended and Restated  Warrant),  a register for
the  Warrants,  in which the  Company  shall  record the name and address of the
Person  in whose  name each  Warrant  has been  issued,  as well as the name and
address of each  transferee  and each prior owner of such  Warrant.

              Section 3. Exchange,  Transfer and  Replacement.  This Amended and
Restated  Warrant is  exchangeable,  upon the surrender hereof by the registered
holder to the Company at its office or agency provided for in Section 2, for new
Warrants of like tenor,  representing in the aggregate the right to purchase the
number of shares of the Common  Stock  purchasable  hereunder,  each of such new
Warrants to represent  the right to purchase such number of shares of the Common
Stock as shall  be  designated  by said  registered  holder  at the time of such
surrender.  This  Amended  and  Restated  Warrant and all rights  hereunder  are
transferable without the necessity of obtaining any consent to such transfer, in
whole or in part,  only upon the  register  provided  for in  Section  2, by the
registered  holder hereof in Person or by duly  authorized  attorney,  and a new
Warrant  shall be made and  delivered by the Company,  of the same tenor as this
Amended and Restated Warrant but registered in the name of the transferee,  upon
surrender of this Amended and Restated Warrant with the Assignment Form attached
hereto duly completed,  at said office or agency of the Company. Upon receipt by
the  Company  at its  office or agency  provided  for in  Section 2 of  evidence
reasonably  satisfactory to it of the loss, theft,  destruction or mutilation of
this  Amended and  Restated  Warrant,  the  Company  will make and deliver a new
Warrant of like tenor in replacement of this Amended and Restated Warrant.  This
Amended and Restated Warrant shall be promptly cancelled by the Company upon the
surrender hereof in connection with any exchange,  transfer or replacement.  The
Company  shall pay all  taxes and all other  expenses  and  charges  payable  in
connection with the preparation,  execution and delivery of Warrants pursuant to
this Section 3.

              Section 4. Exercise of this Amended and Restated Warrant.

              A.  Procedure for Exercise.  In order to exercise this Amended and
Restated  Warrant  in whole or in  part,  the  registered  holder  hereof  shall
complete the  Subscription  Form attached  hereto,  and deliver this Amended and
Restated Warrant to the Company, at its office or agency provided for in Section
2,  together  with one or more of the  following

                                       4

<PAGE>

types of consideration  in an aggregate  amount equal to the aggregate  Purchase
Price of the shares of the Common Stock then being purchased: (i) cash or check;
and (ii) shares of the Common Stock (which shall be valued at their Market Price
on the date of exercise).  In addition to delivering the consideration specified
in the preceding  sentence,  the  registered  holder of the Amended and Restated
Warrant may make a "cashless"  exercise of this Amended and Restated  Warrant by
instructing  the Company to withhold  Warrant  Shares  that would  otherwise  be
issued upon the exercise of this Amended and  Restated  Warrant  (which shall be
valued at their  Market  Price on the date of  exercise).  The  exercise of this
Amended  and  Restated  Warrant  shall be deemed to have been  effected  and the
Purchase  Price  and the  number  of  shares of the  Common  Stock  issuable  in
connection with such exercise shall be determined as of the close of business on
the Business  Day prior to the date on which such  completed  Subscription  Form
shall have been  delivered  at such office or agency.  Upon receipt of such Form
and the  consideration  referenced in the first  sentence of this Section 4, the
Company shall, as promptly as  practicable,  and in any event within 10 Business
Days thereafter, execute or cause to be executed and delivered to said holder by
an air courier which  guarantees next day delivery a certificate or certificates
representing  the  aggregate  number of shares of the Common Stock  specified in
such Form.  Each stock  certificate  so  delivered  shall be in such  authorized
denomination  as may be requested by the  registered  holder hereof and shall be
registered  in the name of said holder or such other name as shall be designated
by said holder, and the Person in whose name any such stock certificate shall be
issued upon such exercise shall be deemed to have become the holder of record of
the shares represented  thereby as of the time when the exercise of this Amended
and  Restated  Warrant  with respect to such shares shall be deemed to have been
effected. If this Amended and Restated Warrant shall have been exercised only in
part,  the Company  shall,  at its expense at the time of delivery of said stock
certificate or certificates,  deliver to such holder a new Warrant of like tenor
evidencing  the rights of such holder to purchase  the  remaining  shares of the
Common Stock covered by this Amended and Restated Warrant. The Company shall pay
all  taxes,   other  expenses  and  charges   payable  in  connection  with  the
preparation,  execution  and  delivery  of stock  certificates  pursuant to this
Section 4.

              B. Acknowledgment of Continuing  Obligation.  The Company will, at
the time of the exercise of this Amended and  Restated  Warrant,  in whole or in
part,  upon request of the  registered  holder  hereof but at the expense of the
Company,  acknowledge  in writing its  continuing  obligation  to said holder in
respect of any rights to which said holder shall  continue to be entitled  after
such exercise in accordance with this Amended and Restated Warrant.

              C.  Character  of Warrant  Shares.  All shares of the Common Stock
issuable  upon the  exercise of this Amended and Restated  Warrant  shall,  when
issued, be duly authorized,  validly issued, previously unissued, fully paid and
non-assessable.

              Section 5.  Anti-Dilution  Provisions.

              A. Adjustment of Purchase Price and Number of Warrant Shares.  The
Purchase  Price shall be subject to adjustment  from time to time as hereinafter
in this Section 5 provided.  Except as otherwise  expressly  provided in Section
5E, upon each  adjustment of the Purchase  Price pursuant to this Section 5, the
registered  holder of this  Amended and Restated  Warrant  shall  thereafter  be
entitled to purchase, at the Purchase Price resulting

                                       5

<PAGE>

from such  adjustment,  the number of shares of the Common Stock  (calculated to
the nearest whole share)  obtained by  multiplying  the Purchase Price in effect
immediately prior to such adjustment by the number of shares of the Common Stock
purchasable  pursuant hereto  immediately  prior to such adjustment and dividing
the product thereof by the Purchase Price resulting from such adjustment.

              B. Purchase Price Adjustment  Formulas.  If and whenever after the
date of this  Amended and  Restated  Warrant,  the  Company  shall (i) declare a
dividend or other  distribution  upon any capital  stock of the Company which is
payable in shares of the Common Stock or Convertible Securities,  (ii) declare a
dividend or any other  distribution upon the Common Stock payable otherwise than
out of the  current  earnings,  retained  earnings  or earned  surplus  or (iii)
subdivide or combine the shares of the Common Stock,  then in each such case the
Purchase Price shall be forthwith changed as provided in Sections 5C, 5D and 5E,
respectively.

              C. Stock Dividends.  In case at any time the Company shall declare
a dividend or any other  distribution upon the Common Stock of the Company which
is payable in shares of the Common  Stock or  Convertible  Securities,  then the
Purchase Price in effect  immediately  prior to the declaration of such dividend
or  distribution  shall be reduced to the quotient  obtained by dividing (1) the
product of (x) the number of shares of the Common Stock  outstanding  and deemed
(in  accordance  with the last  sentence of this  Section 5C) to be  outstanding
immediately  prior to such  declaration,  multiplied  by (y) the then  effective
Purchase  Price,  by  (2)  the  total  number  of  shares  of the  Common  Stock
outstanding and deemed (in accordance with the last sentence of this Section 5C)
to be outstanding  immediately after such declaration (but in no event shall the
Purchase  Price be  reduced  to less than the par value per share of the  Common
Stock). All shares of the Common Stock and all Convertible  Securities  issuable
in payment of any  dividend or other  distribution  upon the Common Stock of the
Company  shall be deemed  after  such  declaration  to have been  issued or sold
without  consideration.  The number of shares of the Common  Stock  deemed to be
outstanding  shall be the total  maximum  number of shares of the  Common  Stock
issuable upon (i) the exercise of all outstanding rights or options to subscribe
for or to  purchase  shares  of the  Common  Stock  and (ii) the  conversion  or
exchange of (A) all outstanding  Convertible  Securities and (B) all Convertible
Securities  issuable  upon the exercise of rights or options to subscribe for or
purchase Convertible Securities.

              D. Extraordinary Dividends and Distributions.  In case at any time
the Company shall declare a dividend or any other  distribution  upon the Common
Stock  payable  otherwise  than out of current  earnings,  retained  earnings or
earned  surplus and otherwise  than in shares of the Common Stock or Convertible
Securities,  the Purchase Price in effect  immediately prior to such declaration
shall be reduced by an amount equal,  in the case of a dividend or  distribution
in cash, to the amount thereof  payable per share of the Common Stock or, in the
case of any other dividend or distribution,  to the fair value thereof per share
of the Common Stock at the time such dividend or distribution  was declared,  as
determined  by the Board of  Directors of the Company (but in no event shall the
Purchase  Price be  reduced  to less than the par value per share of the  Common
Stock).  For the purposes of the foregoing a dividend or distribution other than
in cash shall be considered payable out of earnings, retained earnings or earned
surplus  only to the extent that such  current  earnings,  retained  earnings or
earned surplus are charged an amount equal to the

                                       6

<PAGE>

fair  value of such  dividend  or  distribution  at the time of the  declaration
thereof, as determined by the Board of Directors of the Company. Such reductions
shall take effect as of the date on which a record is taken for the  purposes of
such  dividend  or  distribution,  or, if a record is not taken,  the date as of
which the holders of record of the Common  Stock  entitled  to such  dividend or
distribution are to be determined.

              E.  Stock  Splits  and  Reverse  Splits.  In case at any  time the
Company  shall  subdivide  its  outstanding  shares of the  Common  Stock into a
greater number of shares, the Purchase Price in effect immediately prior to such
subdivision  shall be  proportionately  reduced and the number of Warrant Shares
purchasable upon the exercise of this Amended and Restated  Warrant  immediately
prior to such subdivision shall be proportionately increased, and conversely, in
case at any time the Company shall combine the outstanding  shares of the Common
Stock into a smaller number of shares,  the Purchase Price in effect immediately
prior to such combination shall be  proportionately  increased and the number of
Warrant  Shares  purchasable  upon the  exercise of this  Amended  and  Restated
Warrant immediately prior to such combination shall be proportionately reduced.

              F.  Adjustments  for  Consolidation,   Merger,   Sale  of  Assets,
Reorganization,  Etc.  If at any  time  the  Company  shall  be a  party  to any
transaction (including without limitation a merger,  consolidation,  sale of all
or substantially all of the Company's assets or a recapitalization of the Common
Stock) in which the previously  outstanding  shares of the Common Stock shall be
changed into or exchanged  for  different  securities  of the Company or changed
into or exchanged for common stock or other securities of another corporation or
other property (including cash) or any combination of any of the foregoing (each
such transaction being hereinafter referred to as the "Transaction"; the Company
(in  the  case  of a  recapitalization  of  the  Common  Stock)  or  such  other
corporation being hereinafter  referred to as the "Acquiring  Company";  and the
common  stock of the  Acquiring  Company  being  hereinafter  referred to as the
"Acquiror's   Stock"),   then,  as  a  condition  to  the  consummation  of  the
Transaction,  lawful and  adequate  provisions  shall be made so that,  upon the
basis and the terms and in the manner  provided in this  Section 5F, each holder
of any  Warrants,  upon the  exercise  of such  Warrants  at any time  after the
consummation of the  Transaction,  shall be entitled to receive,  in lieu of the
shares  of  the  Common  Stock   issuable  upon  such  exercise  prior  to  such
consummation,  at the  election of such holder given by notice to the Company on
or before  the later of (x) the day on which the  holders  of the  Common  Stock
approve the Transaction, or (y) the thirtieth day following the date of delivery
or mailing to such  holder of the last proxy  statement  relating to the vote on
the Transaction by the holders of the Common Stock:

                  (i) the stock and other securities, cash and property to which
              such holder would have been entitled upon the  consummation of the
              Transaction if such holder had exercised this Amended and Restated
              Warrant immediately prior thereto (subject to adjustments from and
              after)  the  date  of the  consummation  of the  Transaction  (the
              "Consummation  Date")  as nearly  equivalent  as  possible  to the
              adjustments provided for in Sections 5A and 5F); or

                  (ii) if the Acquiring Company meets the requirements set forth
              in this Section 5F, the number of shares of the  Acquiror's  Stock
              or,  if the  Acquiring  Company  fails to meet,  but a Parent  (as
              defined  in this

                                       7

<PAGE>

              Section 5F) does meet such  requirements,  the number of shares of
              such Parent's common stock (subject to adjustments  from and after
              the  Consummation  Date as nearly  equivalent  as  possible to the
              adjustments  provided  for in Sections 5A and 5F),  determined  by
              dividing (i) the product obtained by multiplying (a) the number of
              shares of the Common Stock to which the holder of this Amended and
              Restated   Warrant  would  have  been  entitled  had  such  holder
              exercised this Amended and Restated Warrant  immediately  prior to
              the consummation of the Transaction,  times (b) the greater of the
              Purchase  Price  or the  Acquisition  Price  (as  defined  in this
              Section  5F) in  effect  on the  date  immediately  preceding  the
              Consummation  Date,  by (ii) the  Market  Value of the  Acquiror's
              Stock on the date immediately preceding the Consummation Date.

              For the purposes of this Section 5F: the term "Market Value" shall
mean, for any share of common stock on any date specified herein,  the last sale
price,  regular  way, on such date or, if no sale takes place on such date,  the
average  of the  closing  bid and  asked  prices on such  date,  in each case as
reported on the New York Stock  Exchange  or, if such common stock is not listed
on the New York Stock  Exchange but is  authorized  for  quotation on the Nasdaq
National  Market,  the last  transaction  price  per  share of  common  stock as
reported by the Nasdaq National  Market on such date; and the term  "Acquisition
Price" shall mean the  consideration per share to be paid for or received by the
holders of the previously  outstanding  shares of the Common Stock in accordance
with the terms of the Transaction,  determined (x) in the case where the holders
of the previously  outstanding  shares of Common Stock received solely shares of
the Acquiror's Stock in the Transaction,  by multiplying the Market Value of the
Acquiror's Stock as of the date immediately preceding the Consummation Date by a
fraction the numerator of which shall be the  aggregate  number of shares of the
Acquiror's  Stock to be received in the  Transaction  in exchange for all of the
previously  outstanding  shares of the Common Stock and the denominator of which
shall be the  aggregate  number  of such  previously  outstanding  shares of the
Common Stock,  and (y) in any other case, by dividing the aggregate  fair market
value (using  Market Value for any shares of the  Acquiror's  Stock),  as of the
date immediately preceding the Consummation Date of the aggregate  consideration
to be received by the holders of such  previously  outstanding  shares of Common
Stock by the number of shares of such previously  outstanding  Common Stock. The
requirements referred to in clause (ii) of this Section 5F with reference to the
Acquiring  Company or to a corporation  (herein referred to as a "Parent") which
directly or indirectly  controls the Acquiring Company are as follows:  (AA) its
common  stock is listed on the New York Stock  Exchange  or quoted on the Nasdaq
National  Market and such common stock continues to meet such  requirements  for
listing or quotation  thereon,  (BB) it is required to file,  and in each of its
three  fiscal  years  immediately  preceding  the  Consummation  Date has filed,
reports with the Commission pursuant to Section 13 or 15(d) of the Exchange Act,
and (CC) in the case of a  Parent,  such  Parent  is  required  to  include  the
Acquiring  Company in the  consolidated  financial  statements  contained in the
Parent's  Annual  Report  on  Form  10-K  and  is  not  itself  included  in the
consolidated   financial   statements  of  any  other  Person  (other  than  its
consolidated  subsidiaries).  Notwithstanding anything contained in this Amended
and  Restated  Warrant  to the  contrary,  the  Company  shall  not  effect  any
Transaction  unless prior to or  simultaneously  with the  consummation  of such
Transaction  the survivor or successor  corporation  (if other than the Company)
resulting from such

                                       8

<PAGE>

Transaction  shall assume by written  instrument  executed and delivered to each
Warrantholder,  the obligation to deliver to such  Warrantholder  such shares of
stock,  securities  or assets as, in accordance  with the foregoing  provisions,
such  Warrantholder  may be  entitled  to receive,  and  containing  the express
assumption by such successor corporation of the due and punctual performance and
observance  of every  provision  of this  Amended  and  Restated  Warrant  to be
performed and observed by the Company and of all  liabilities and obligations of
the Company hereunder.

              G. Statement  Regarding  Adjustments.  Upon each adjustment of the
Purchase  Price and upon each change in the number of shares of the Common Stock
issuable upon exercise of this Amended and Restated Warrant, and in the event of
any change in the rights of the holder of this Amended and  Restated  Warrant by
reason of other events herein set forth, then and in each such case, the Company
will  promptly  obtain an  opinion  of a firm of  independent  certified  public
accountants of recognized  national standing (who may be the regular auditors of
the Company)  selected by the Company's  chief  financial  officer,  stating the
adjusted Purchase Price and the new number of shares so issuable,  or specifying
the  other  shares  of  stock,  securities  or  assets  and the  amount  thereof
receivable as a result of such change in rights, and setting forth in reasonable
detail the method of  calculation  and the facts upon which such  calculation is
based. The Company will promptly mail a copy of such accountants' opinion to the
registered holder of this Amended and Restated Warrant.

              H.  Outside  Opinion.  In  case at any  time or from  time to time
conditions arise by reason of action taken by the Company,  which in the opinion
of its Board of Directors,  are not adequately covered by the provisions of this
Section 5, and which might  materially and adversely  affect the exercise rights
of the registered holders of the Warrants, the Board of Directors of the Company
may appoint a firm of  independent  certified  public  accountants of recognized
national  standing,  which may be the firm  regularly  retained by the  Company,
which  shall  give  their  opinion  upon  the  adjustment,  if  any,  on a basis
consistent  with the  standards  established  in the  other  provisions  of this
Section 5,  necessary  with  respect to the Purchase  Price,  so as to preserve,
without dilution, the exercise rights of the registered  Warrantholders.  If the
Board of  Directors  of the  Company  does  not  appoint  a firm of  independent
certified  public  accountants  to give the opinion  described in the  preceding
sentence,  the Company's chief financial officer shall render such opinion. Upon
receipt of such opinion from either the independent certified public accountants
or the Company's chief financial officer,  the Board of Directors of the Company
shall forthwith make the adjustments  described herein.

              Section  6.  Certain  Agreements  of  the  Company.   The  Company
covenants and agrees that:

              A. Will Reserve Shares.  The Company will  authorize,  reserve and
set apart and have  available  for issuance at all times,  free from  preemptive
rights, that number of the shares of the Common Stock which are deliverable upon
the exercise of this Amended and Restated Warrant,  and the Company will have at
all times such other rights or  privileges  which are  necessary to enable it at
any time to fulfill  all of its  obligations  hereunder.

              B. Will Avoid Certain Actions.  The Company will not, by amendment
of its certificate of incorporation or through any  reorganization,  transfer of
assets,  consolidation,  merger, issue or sale of securities or otherwise, avoid
or take any action  which would have

                                       9

<PAGE>

the effect of avoiding the  observance or  performance of any of the terms to be
observed or performed  hereunder  by the Company,  but will at all times in good
faith assist in carrying out all of the  provisions of this Amended and Restated
Warrant.  Without limiting the generality of the foregoing, the Company will not
take any action to revoke,  call,  redeem,  cancel or otherwise  terminate  this
Amended  and  Restated  Warrant or the rights  granted  under this  Amended  and
Restated Warrant.

              C. Will Secure Governmental Approvals. If any shares of the Common
Stock  required to be reserved  for the purposes of exercise of this Amended and
Restated  Warrant  require  registration  with or approval  of any  governmental
authority  under any federal law (other  than the  Securities  Act) or under any
state law before such shares of the Common Stock may be issued upon  exercise of
this  Amended  and  Restated  Warrant,  the Company  will,  at its  expense,  as
expeditiously  as possible  use its best efforts to cause such shares to be duly
registered  or approved,  as the case may be.

              D. Will Pay Certain Taxes and Fees. The Company will pay all issue
or  transfer  taxes with  respect to the  issuance  or transfer of shares of the
Common Stock to each holder of the Warrants in connection  with each exercise of
the  Warrants,  as well as all fees and  expenses  incurred  by the  Company  in
connection  with each such issuance or transfer.

              E. Will Bind Successors. This Amended and Restated Warrant will be
binding upon any corporation succeeding to the Company by merger,  consolidation
or  acquisition  of  all  or  substantially  all  of  the  Company's  assets.

              Section 7.  Notifications  by the Company.  In case at any time:

                   (1) the  Company  shall  declare  upon the  Common  Stock any
              dividend or other  distribution  (except out of current  earnings,
              retained  earnings or earned surplus) to the holders of the Common
              Stock;

                   (2) the Company shall make an offer for subscription pro rata
              to the  holders of the Common  Stock of any  additional  shares of
              stock of any class or other rights;

                   (3) the Board of  Directors  of the Company  shall  authorize
              (whether  definitively  or subject to any  conditions) any capital
              reorganization,  or  reclassification  of the capital stock of the
              Company,  or  consolidation or merger of the Company with, or sale
              of all or substantially all of its assets to, another Person;

                   (4) the Board of  Directors  of the Company  shall  authorize
              (whether  definitively  or subject to any  conditions) a voluntary
              dissolution, liquidation or winding-up of the Company; or

                   (5)  the  Company   shall  become   subject  to   involuntary
              dissolution, liquidation or winding-up;

then,  in each of such cases,  the Company  shall give notice to the  registered
holder of this Amended and  Restated  Warrant of the date on which (a) the books
of the  Company  shall  close or a record  shall  be  taken  for such  dividend,
distribution   or   subscription    rights,   or   (b)

                                       10

<PAGE>

such reorganization, reclassification, consolidation, merger, sale, dissolution,
liquidation or winding-up  shall take place or be voted upon by  stockholders of
the  Company,  as the case may be. Such notice shall also specify the date as of
which the holders of record of shares of the Common Stock shall  participate  in
such dividend,  distribution  or  subscription  rights,  or shall be entitled to
exchange  their  shares of the Common  Stock or  securities  for other  property
deliverable upon such reorganization,  reclassification,  consolidation, merger,
sale,  dissolution,  liquidation or winding-up,  as the case may be. Such notice
shall be given not less than 30 and not more than 90 days prior to the action in
question and not less than 30 days and not more than 90 days prior to the record
date or the date on which the  Company's  transfer  books are  closed in respect
thereto  and such  notice  shall state that the action in question or the record
date is subject  to the  effectiveness  of a  registration  statement  under the
Securities Act, or to a favorable vote of stockholders, if either is required.

              Section 8. Rights of a  Stockholder.  This  Amended  and  Restated
Warrant  shall not entitle any  Warrantholder  to any voting rights or any other
rights, or subject any Warrantholder to any liabilities, as a stockholder of the
Company.

              Section  9.  Modification;  Waivers.  This  Amended  and  Restated
Warrant  may be  modified  or  amended  only with the  written  consent  of each
Warrantholder.  The Company shall not be released from its obligations hereunder
without the written consent of each Warrantholder. The observance of any term of
this  Amended and  Restated  Warrant  may be waived  (either  generally  or in a
particular  instance and either  retroactively or  prospectively)  by the Person
entitled to enforce such term, but any such waiver shall be effective only if in
a writing  signed by the Person  against  which such  waiver is to be  asserted.
Except as otherwise  specifically  provided herein,  no delay on the part of any
Person in exercising any right, power or privilege  hereunder shall operate as a
waiver  thereof,  nor  shall any  waiver on the part of any party  hereto of any
right,  power or  privilege  hereunder  operate as a waiver of any other  right,
power or  privilege  hereunder  nor shall any single or partial  exercise of any
right,  power or  privilege  hereunder  preclude  any other or further  exercise
thereof or the exercise of any other  right,  power or  privilege  hereunder.

              Section 10. Entire  Agreement.  This Amended and Restated Warrant,
the Omnibus Agreement,  the New License Agreement,  and that certain Amended and
Restated Registration Rights Agreement dated the date hereof between the Company
and SmithKline Beecham Biologicals  Manufacturing s.a.and SmithKline Beecham plc
represent the entire  understanding  and agreement  between the parties  thereto
with  respect  to the  subject  matter  hereof  and  supersede  all other  prior
agreements  and  understandings,  both  written  and oral,  between  the parties
thereto with respect to the subject matter hereof and thereof.

              Section 11.  Severability.  If any  provision  of this Amended and
Restated  Warrant,  or the  application  of  such  provision  to any  Person  or
circumstance,  shall be held invalid, the remainder of this Amended and Restated
Warrant or the  application of such provision to other Persons or  circumstances
shall not be affected  thereby;  provided,  that the parties shall  negotiate in
good faith  with  respect  to an  equitable  modification  of the  provision  or
application thereof held to be invalid.

              Section 12. Notices.

                                       11

<PAGE>

              A. Any notice or  communication  to any Person shall be duly given
if in writing and  delivered in Person,  receipt  requested,  or  overnight  air
courier   guaranteeing   next  day  delivery  or  by  facsimile   (with  written
confirmation  of  receipt),  to such  other  party's  address  (or to such other
address as such other party shall have specified in a notice given in accordance
with this Section 12.)


                 If to the Company:

                 300 Professional Drive
                 Gaithersburg,  Maryland  20879
                 Attention:  President and Chief  Executive  Officer
                 Facsimile: (301) 590-1252

                 If to SmithKline Beecham Biologicals Manufacturing s.a.:

                 Rue de L'Institut 89
                 B-1330 Rixensart
                 Belgium
                 Attention:  President, General Manager
                 Facsimile:  011-32-2-656-8026

                 with a copy to:

                 SmithKline Beecham Corporation
                 One Franklin Plaza
                 P.O. Box 7929
                 Philadelphia, Pennsylvania  19101-7929
                 Attention:  Edgar B. Cale III, Esq.
                 Facsimile:  (215) 751-3935

              B. All notices and communications will be deemed to have been duly
given:  at the time  delivered by hand,  if personally  delivered;  and the next
business day after  timely  delivery to the  courier,  if sent by overnight  air
courier guaranteeing next day delivery.

              Section 13.  Headings.  The Section  headings in this  Amended and
Restated  Warrant are for convenience of reference only, and shall not be deemed
to alter or affect the meaning or  interpretation  of any  provision  hereof.

              Section 14. Construction.  This Amended and Restated Warrant shall
be governed,  construed and enforced in accordance with the laws of the State of
Delaware, without regard to its principles of conflict of laws.

              Section 15. No Adverse Agreements. The Company has not previously,
and will not hereafter,  enter into any agreement with respect to its securities
which is  adverse  to the  rights  granted  to  SmithKline  Beecham  Biologicals
Manufacturing  s.a.  and its  successors  and  assigns  under this  Amended  and
Restated Warrant.

                                       12

<PAGE>

              Section 16.  Specific  Performance.  The Company  agrees that this
Amended and Restated  Warrant cannot be purchased or sold in the open market and
that, for these reasons,  among others,  each  Warrantholder will be irreparably
damaged in the event that this Amended and Restated  Warrant is not specifically
enforceable.  Accordingly,  in the  event  of any  controversy  concerning  this
Amended and Restated Warrant, or any right or obligation  hereunder,  such right
or obligation shall be enforceable in a court of equity by specific performance.
The rights granted in this Section 16 shall be cumulative and not exclusive, and
shall be in addition to any and all other  rights  which the  Warrantholder  may
have hereunder, at law or in equity.

              Section 17. Transfer and Assignment. The registered holder of this
Warrant may transfer and assign this  Warrant and its rights  hereunder  without
the necessity of obtaining any consent to such transfer or assignment,  provided
that the registered  holder is permitted to transfer or assign its shares of the
Common  Stock  under the terms of Section  2.1 of the  Omnibus  Agreement.

              [The Balance of This Page Intentionally Left Blank]


                                       13

<PAGE>


              IN WITNESS  WHEREOF,  Antex Biologics Inc. has caused this Amended
and Restated Warrant to be executed and delivered by its duly authorized officer
under its  corporate  seal,  attested by its duly  authorized  officer and to be
dated September 1, 1999.


                                       ANTEX BIOLOGICS INC.



                                       By: /s/ V.M. Esposito
                                          -------------------------------------
                                          Name:  V.M. Esposito
                                          Title:  Chairman & CEO


[Corporate Seal]

Attest:


/s/ Gregory C. Zakarian
- ----------------------------------
Name:  Gregory C. Zakarian
Title:  Secretary



                                       14

<PAGE>


                               SUBSCRIPTION FORM

                     To be Executed by the Registered Holder
                   Desiring to Exercise the Within Warrant of

                              ANTEX BIOLOGICS INC.


              The undersigned  registered  holder hereby  exercises the right to
purchase  _______  shares of the Common  Stock  covered  by the within  Warrant,
according to the conditions  thereof,  and herewith makes payment in full of the
Purchase   Price   of  such   shares,   $__________________   by   delivery   of
__________________________________.

[Alternatively.  The undersigned registered holder hereby exercises the right to
purchase ___ shares of the Common Stock covered by the within Warrant, according
to the terms  thereof and  herewith  makes a  "cashless"  exercise of the within
Warrant and instructs  Antex Biologics Inc. to withhold ___ shares of the Common
Stock that would otherwise be issued upon the exercise of the within Warrant.]



                                    -------------------------------
                                    Name of Registered Holder


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


                                    -------------------------------
                                    Title


                                    Address
                                             --------------------------

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


Dated:
      -------------------------


                                       15


<PAGE>


                                ASSIGNMENT FORM

                     To Be Executed by the Registered Holder
                   Desiring to Transfer the Within Warrant of

                              ANTEX BIOLOGICS INC.

              FOR VALUE  RECEIVED,  the  undersigned  registered  holder  hereby
sells,  assigns  and  transfer  unto  _________________  the  right to  purchase
____________________  shares of the Common Stock covered by the within  Warrant,
and  does  hereby  irrevocably  constitute  and  appoint  ______________________
Attorney to transfer the said Warrant on the books of the Company (as defined in
said Warrant), with full power of substitution.


                                    -------------------------------
                                    Name of Registered Holder


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


                                    -------------------------------
                                    Title


                                    Address
                                             --------------------------

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


Dated:
      -------------------------

In the presence of

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



                                     NOTICE:

              The signature to the foregoing  Assignment Form must correspond to
the name as  written  upon the face of the within  Warrant in every  particular,
without alteration or enlargement or any change whatsoever.






                                       16





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