AVIRON
8-K, 1997-07-21
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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<PAGE>
 
                      SECURITIES AND EXCHANGE COMMISSION

                            Washington, D.C.  20549

                                   FORM 8-K

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


       Date of Report (Date of earliest event reported):  April 16, 1997


                                    AVIRON
            (Exact name of registrant as specified in its charter)



       Delaware                     0-20815                  77-0309686
(State of jurisdiction)      (Commission File No.)         (IRS Employer
                                                         Identification No.)



                           297 North Bernardo Avenue
                            Mountain View, CA 94043
             (Address of principal executive offices and zip code)



      Registrant's telephone number, including area code:  (415) 919-6500

                                       1
<PAGE>
 
Item 5.     Other Events

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

     On April 16, 1997, Aviron signed a Contract Manufacture Agreement with
Evans Medical Limited. This agreement is filed as Exhibit 10.15 and is
incorporated herein by reference.


Item 7.     Financial Statements, Pro Forma Financial Information and Exhibits

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


(c)  Exhibits.

Exhibit
Number         Description
- -------        -----------

*10.15         Contract Manufacture Agreement between the Registrant and Evans
               Medical Limited, dated as of April 16, 1997


* Certain information in this exhibit has been omitted and filed separately with
  the Commission. Redacted portions of the exhibit are indicated by an asterix
  within brackets ([*]), and a legend appears on the appropriate pages.
  Confidential Treatment has been requested with respect to the omitted
  portions.

                                       2
<PAGE>
 
                                   SIGNATURES


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

                                    Aviron



Dated:  July 18, 1997            By: /s/ J. Leighton Read
                                     -----------------------------------
                                       J. Leighton Read, M.D.
                                       Chairman of the Board and
                                       Chief Executive Officer

                                       3
<PAGE>
 
                                 EXHIBIT INDEX


Exhibit
Number         Description
- -------        -----------

*10.15         Contract Manufacture Agreement between the Registrant and Evans
               Medical Limited


* Certain information in this exhibit has been omitted and filed separately with
  the Commission. Redacted portions of the exhibit are indicated by an asterix
  within brackets ([*]), and a legend appears on the appropriate pages.
  Confidential Treatment has been requested with respect to the omitted
  portions.

                                       4

<PAGE>
 
                                                                   EXHIBIT 10.15


                              CONTRACT MANUFACTURE
                                   AGREEMENT



                                 EVANS MEDICAL
                                    LIMITED

                                      AND

                                     AVIRON



                                 APRIL 16, 1997


[ * ] = Certain information in this exhibit has been omitted and filed
separately with the Commission. Redacted portions of the exhibit are indicated
by an asterix within brackets ([ * ]), and a legend appears on the appropriate
pages. Confidential treatment has been requested with respect to the omitted
portions.
<PAGE>
 
<TABLE>
   <C>    <S>                                                                          <C>
    1.   Definitions................................................................    1
    2.   Contract Manufacture.......................................................    5
    3.   Technical Agreement........................................................    8
    4.   Duration and Interpretation................................................    9
    5.   Forecast and Supply........................................................    9
    6.   Intellectual Property and Improvements.....................................   11
    7.   Prices.....................................................................   12
    8.   Indemnity..................................................................   13
    9.   Confidentiality............................................................   14
   10.   Liaison....................................................................   14
   11.   Change of Control..........................................................   14
   12.   Termination................................................................   15
   13.   Associated Companies.......................................................   17
   14.   Force Majeure..............................................................   18
   15.   Notices....................................................................   18
   16.   Michigan License...........................................................   19
   17.   General....................................................................   20
   18.   Public Disclosure..........................................................   21
   Schedule 1- Technical Agreement .................................................   23
   Schedule 2 - Price for Production................................................   33
   Schedule 3 - Trademarks .........................................................   35
   Schedule 4 - Development Agreement...............................................   36
   Schedule 5 - Michigan Agreement..................................................   37
   Schedule 6- Aviron's Assets......................................................   38
</TABLE>
<PAGE>
 
                        CONTRACT MANUFACTURE AGREEMENT

THIS AGREEMENT is made the 16/th/ day of April 1997

BETWEEN

"Evans" Evans Medical Limited whose registered office is at Evans House, Regent
Park, Kingston Road, Leatherhead, Surrey, KT22 7PQ, United Kingdom

and

"Aviron" Aviron (a Delaware Corporation) whose registered office is at 297 North
Bernardo Avenue, Mountain View, California 94043, United States of America

RECITALS:

A.   Evans carries on the business of, inter alia, Manufacture, assembly and
     packaging of pharmaceutical products.

B.   Aviron wishes Evans to Manufacture the Products (as hereinafter defined)
     and Evans is willing to Manufacture the Products on the terms and
     conditions hereinafter set out.

C.   Aviron is the exclusive licensee of the University of Michigan to certain
     live attenuated influenza Virus Seeds and the technology associated with
     and required for the production of certain reassortants therefrom.

THE PARTIES AGREE AS FOLLOWS:

1.   DEFINITIONS

     1.1.  In this Agreement the following terms shall have the following
           meanings unless the context otherwise requires:

           1.1.1.  "Agency" means any governmental body responsible for
                   licensing of the Product for commercial sale and the
                   licensing of premises and facilities of the Manufacturer.

           1.1.2.  "Associated Companies" means (i) in respect of Evans any
                   company which at the relevant time is a subsidiary of that
                   party's ultimate holding company or any subsidiary of such a
                   subsidiary where the term subsidiary shall have the meaning
                   as defined under s736 of the English Companies Act 1985 (as
                   amended); and, (ii) in respect of Aviron, any entity that
                   directly or indirectly owns, is owned by or is under common
                   ownership with Aviron, where own or ownership means direct or
                   indirect possession of at least fifty percent (50%) of the
                   outstanding voting securities of a corporation or a
                   comparable equity interest in any other type of entity.

                                       1
<PAGE>
 
           1.1.3.  "Aviron Assets" means capital equipment purchased by Aviron
                   for use in the Manufacture of the Product as more
                   particularly specified in (Schedule 6).

           1.1.4.  "Bulk Monovalent Intermediates" means material produced from
                   one or all Working Seeds in quantities sufficient for
                   Manufacture of Product.

           1.1.5.  "Certificate of Analysis" means documentation provided by
                   suppliers specifying the characteristics of materials being
                   supplied as such term is understood in U.K. Pharmaceutical
                   manufacturing practice.

           1.1.6.  "Consistency Lot" means batches of Product Manufactured at
                   Commercial Manufacturing scale for the purposes of obtaining
                   Agency approval to market, distribute, and sell the Product.

           1.1.7.  "Commercial Manufacturing" means any Manufacture of the
                   Product intended for sale, and also any Manufacture of
                   samples of the Product, and materials necessary for the
                   marketing, testing, quality control, and stability studies of
                   such Manufacture.

           1.1.8.  "Development" means the development of a manufacturing
                   process for Manufacture of Product.

           1.1.9.  "Effective Date" means 1st May 1997.

           1.1.10. "FDA" means Food and Drug Administration of the United States
                   of America.

           1.1.11. "Force Majeure" means, in relation to either party, any
                   circumstances beyond the reasonable control of that party
                   including, without limitation, any Act of God, fire,
                   explosion, flood, war or hostilities, acts of Government
                   appointed agents, embargoes or other export restrictions, or
                   perils of the sea.

           1.1.12. "Manufacture" means the production of the Product from the
                   Raw Materials and shall include production of Working Seeds
                   from Virus Seeds, production of Bulk Monovalent Intermediates
                   from Working Seeds, blending, assembly, packaging, testing
                   and quality control and "Manufactured", "Manufacturing", and
                   "Manufacturer" shall be interpreted accordingly.

           1.1.13. "Master Strains" shall mean the live attenuated influenza
                   vaccine seeds exclusively licensed from Michigan to Aviron,
                   and which are modified at Aviron to produce Virus Seeds.

                                       2
<PAGE>
 
           1.1.14. "Manufacturing Records" means all documentation associated
                   with Manufacture of the Product, including, without
                   limitation, all batch information regarding analysis,
                   distribution and Manufacture.

           1.1.15. "MPB" means Multi-Purpose Bacterials which is a manufacturing
                   area designated as such within Evans' Liverpool facility.

           1.1.16. "Michigan" means the Regents of the University of Michigan, a
                   constitutional corporation of the State of Michigan with
                   offices located at Wolverine Tower, Room 2071, 3003 South
                   State Street, Ann Arbor, Michigan, 48109-1280, USA.

           1.1.17. "Michigan Agreement" means the Material Transfer and
                   Intellectual Property Agreement dated February 24, 1995
                   between Michigan and Aviron.

           1.1.18. "Price for Production" means specific price for facilities,
                   and activities conducted by Evans for the Manufacture of the
                   Products as defined in Schedule 2.

           1.1.19. "Process Improvements" means all improvements, modifications
                   or adaptations to the process, or method of Manufacture used,
                   created or discovered by Evans and not solely and
                   specifically related to the Manufacture of the Product which
                   arise in association with the process of Manufacture of the
                   Product.

           1.1.20. "Product" means either Working Seed, Bulk Monovalent
                   Intermediate, Vaccine, or any of the three, as specified by
                   Aviron, a description of which is set out in the Technical
                   Agreement.

           1.1.21. "Raw Materials" means the components defined in the Technical
                   Agreement and required by Evans in the Manufacture of the
                   Product.

           1.1.22. "Restricted Information" means (i) Master Strains, Virus
                   Seeds and Working Seeds; (ii) all Technical Information
                   relating to Master Strains, the Virus Seeds and the
                   Manufacture of the Product; (iii) all information relating to
                   the Discloser's business; and (iv) all information arising
                   pursuant to this Agreement, disclosed by one party to this
                   Agreement (the "Discloser") to the other (the "Recipient") in
                   connection with this Agreement, excluding any such
                   information which:

                   1.1.22.1.is or was already known to the Recipient at the time
                            of disclosure by the Discloser; or

                   1.1.22.2.was at the time of such disclosure or communication
                            by the Discloser or thereafter becomes or became
                            published, accessible to


                                       3
<PAGE>
 
                            the public or otherwise in the public domain other
                            than through any act or omission of the Recipient;
                            or

                   1.1.22.3.must be disclosed to government inspectors in the
                            discharge of statutory obligations provided that
                            before disclosure the Recipient shall use reasonable
                            endeavors as it would in respect of its own
                            Restricted Information to obtain from such
                            government inspectors any assurances as regards
                            confidentiality as may be afforded to such
                            information in the circumstances; or

                   1.1.22.4.must be disclosed by the Recipient to the relevant
                            Agency in the course of applying for, obtaining or
                            maintaining regulatory approval; or

                   1.1.22.5.is hereafter disclosed to the Recipient by a third
                            party, who to the knowledge of the Recipient does
                            not have any obligations of confidentiality to any
                            third party or who has not, to the actual knowledge
                            of the Recipient, derived it directly or indirectly
                            from the Discloser or the University of Michigan, or

                   1.1.22.6.is required to be disclosed by law.

          1.1.23.  "Specifications" means requirements and specifications for
                   the Manufacture of Product attached to the Technical
                   Agreement (Schedule 1), as may be amended from time to time
                   by agreement between both parties.

          1.1.24.  "Technical Agreement" means the Technical Agreement, which
                   may be amended from time to time, to be entered into between
                   the parties (Schedule 1) prior to Commercial Manufacturing of
                   the Product.

          1.1.25.  "Technical Information" means all registration data, know-
                   how, experience, instructions, standards, methods, test and
                   trial results, manufacturing and formulation processes,
                   hazard assessments, quality control standards, formulae,
                   specifications, storage and data, samples, drawings, designs,
                   description of packaging materials and all other relevant
                   information relating to the Product or its design,
                   Manufacture, formulation, handling, storage and use.

          1.1.26.  "Trade Mark" means the trade marks set out in Schedule 3
                   which are either owned by Aviron or to which Aviron has a
                   right of use (with the right to sub-license).

          1.1.27.  "Vaccine" means the blended, filled and from time to time
                   packaged cold-adapted multivalent influenza vaccine
                   incorporating Bulk Monovalent Intermediates grown from
                   Working Seeds.

                                       4
<PAGE>
 
          1.1.28.  "Virus Seeds" means certain reassortants produced by Aviron
                   from the Master Strain.

          1.1.29.  "Working Seeds" means the virus reassortants produced by
                   Evans, from time to time, from the Virus Seeds, and from
                   which the Bulk Monovalent Intermediate is produced.

    1.2.  Any reference in this Agreement to "writing" or cognate expressions
          includes a reference to telex, cable, facsimile transmission or
          comparable means of communication.

    1.3.  Words in this Agreement importing the singular meaning shall where the
          context so admits include the plural meaning and vice versa.

    1.4.  The headings in this Agreement are for convenience only and shall not
          affect its interpretation.

2.   CONTRACT MANUFACTURE

    2.1.  Aviron hereby appoints Evans and Evans accepts the appointment as
          Manufacturer of the Product for the term of this Agreement. During the
          period of this Agreement Evans will Manufacture for Aviron the Product
          in accordance with this Agreement and the Technical Agreement.

    2.2.  Aviron shall be responsible for and shall bear all risks associated
          with the importation and supply to Evans of the Virus Seeds into the
          United Kingdom. Aviron shall be responsible for export of the Product
          from the United Kingdom and any costs and expenses associated
          therewith or relevant thereto. Evans shall assist at Aviron's
          reasonable request and at Aviron's expense with the export of the
          Product from the United Kingdom.

    2.3.  Evans covenants that:

          2.3.1.  it will carry out the Manufacture in accordance with this
                  Agreement and the Technical Agreement;

          2.3.2.  all Raw Materials supplied by Evans and used in Manufacture
                  will comply with the Technical Agreement;

          2.3.3.  it will keep under review the conditions of the Virus Seed,
                  Raw Materials and Product in storage as such conditions are
                  defined in the Technical Agreement;

          2.3.4.  it will upon written request of Aviron, and at Aviron's
                  expense, supply Aviron with samples of the Product
                  Manufactured by it prior to delivery of ordered Product;

                                       5
<PAGE>
 
          2.3.5   it shall retain for a minimum of seven (7) years and make
                  available to Aviron on reasonable notice all Manufacturing
                  Records;

          2.3.6.  it will Manufacture all Product in compliance with current FDA
                  Good Manufacturing Practices as set forth in the United States
                  Code of Federal Regulations as amended from time to time, and
                  other applicable rules and regulations of the FDA and other
                  United States governmental or regulatory agencies, and any
                  current practices of any relevant UK agency, with jurisdiction
                  over the manufacture, use or sale of the Products as then in
                  effect;

          2.3.7.  it will permit Aviron periodically and upon reasonable notice
                  to Evans, representatives of Aviron, its Associated Companies
                  previously authorized by Evans, such authorization not to be
                  unreasonably withheld, and any Agency to have access to any
                  relevant records in connection with such Manufacture, and to
                  audit and observe Evans' operations in relevant parts of the
                  premises where Manufacture of Product is carried out, and
                  assess its compliance with current FDA Good Manufacturing
                  Practices, and any current practices of any relevant UK
                  agency, and to discuss any related issues with Evans'
                  management personnel;

          2.3.8.  it will notify Aviron of any recall of the Product of which it
                  becomes aware and will provide Aviron at Aviron's cost with
                  any and all assistance in connection with a recall of the
                  Products as may reasonably be requested by Aviron. In the
                  event of a voluntary recall, the party initiating the recall
                  shall bear the expenses incurred in connection with such
                  voluntary recall. In the event of a mandatory recall, Evans
                  shall meet the cost of such a recall where the recall is
                  solely the result of the negligence of Evans, but in all other
                  cases Aviron shall bear all costs and expenses incurred in
                  connection with the recall.

          2.3.9.  MPB, in addition to other facilities as required, will be made
                  available for the Manufacture of the Product during the term
                  of this Agreement subject to any periods of closure or
                  unavailability for the purposes of the conduct of maintenance
                  and repair in respect of which Evans shall give reasonable
                  notice to Aviron. Furthermore and subject to Aviron's
                  agreement, MPB may be used for the conduct of research and
                  development towards the improvement of the Product and the
                  Manufacture, provided however, that any and all proprietary
                  rights to such improvements shall be governed by Clause 6.4.

         2.3.10.  it is in possession of, and during the term of the Agreement
                  will maintain, a current Manufacturing License No ML 0039/02
                  granted pursuant to the Medicines Act 1968 permitting Evans to
                  Manufacture the Vaccine.

                                       6
<PAGE>
 
  2.4.  Aviron covenants that:

         2.4.1.  prior to Evans' obligations to Manufacture the Product
                 hereunder arising it will supply and transfer to Evans all
                 Technical Information in its possession (unless it has
                 previously supplied Evans with the Technical Information
                 pursuant to the terms of the Technical Agreement) which is
                 necessary to enable Evans to Manufacture the Product, including
                 all information regarding health, safety, environmental, and
                 FDA regulations, as it becomes known;

         2.4.2.  it will provide such technical assistance, at Aviron's expense,
                 as may be required to enable the effective transfer of the
                 Technical Information under 2.4.1 such that Evans should
                 reasonably be expected to be able to Manufacture the Product on
                 the basis of such Technical Information;

         2.4.3.  where Raw Materials and other supplies are to be provided by
                 Aviron, Aviron will ensure that they comply with the Technical
                 Agreement and where appropriate shall be accompanied by a
                 Certificate of Analysis;

         2.4.4.  it shall notify Evans of any special requirements in respect of
                 recordkeeping that may be necessary to comply with Aviron's
                 Recall Procedure. Evans shall have the right to refuse such
                 request if it deems the request is unreasonable or to require
                 specific further compensation should the request entail costs
                 to be incurred by Evans.

   2.5.  Evans shall be entitled to purchase and install equipment, all
         replacement tooling or parts or make modifications to the buildings and
         services as may be required for the Commercial Manufacture of the
         Product, the cost of which Aviron shall pay to Evans upon receipt of a
         valid invoice therefor. Notwithstanding the above, Evans shall not
         purchase and/or install any such equipment, tooling or parts or make
         such modifications where the cost of any one item would exceed US$5,000
         or where the total cost of such items in one calendar month will exceed
         US$15,000 in relation to the Agreement without first obtaining the
         prior written consent of Aviron. Such equipment, tooling or parts shall
         be the property of Aviron and form part of Aviron's Assets and shall be
         deemed included in Schedule 6. Where the cost of one item would exceed
         US$5,000, Evans may at its discretion demand from Aviron such assurance
         as Evans deems necessary, up to but not exceeding the expected cost of
         the said item, prior to the order for the purchase of the said item
         being placed. Evans will be the final arbiter of the specification of
         such items with regard to the said item's compliance with the
         requirements of the Agency and with health and safety. Any equipment or
         tooling purchased by Evans hereunder and paid for by Aviron shall not
         be used by Evans for any purpose outside the scope of this Agreement or
         the Development Agreement without the consent of Aviron.

                                       7
<PAGE>
 
   2.6    Those items of capital equipment identified as Aviron's Assets in
          Schedule 6 are owned by Aviron and shall at all times be at the risk
          of Aviron, except in the case of Evans' negligence in which
          circumstance such Aviron's Assets shall be deemed, for the purpose of
          this Agreement, to be at the risk of Evans. Aviron shall insure and
          provide evidence to Evans' reasonable satisfaction that such equipment
          is appropriately insured and that such insurance covers any loss of or
          damage to Evans' property personnel or business as a consequence of
          any damage whatsoever caused to or by such equipment or its loss,
          damage, or destruction, unless due to the negligence of Evans. Evans
          is responsible for determining the need for, and managing the
          maintenance of Aviron's Assets to Evans' specification. Aviron shall
          be responsible for the reasonable cost of maintaining such equipment
          in good working order and repair as might be desirable for the
          purposes of Manufacture of the Products by Evans. Upon expiry or
          termination of this Agreement, Aviron shall, within ninety (90) days
          thereof, remove the said equipment from Evans' premises and shall
          repair and restore to the condition it was prior to the equipment
          being installed, any part of Evans' premises where such equipment
          shall have been situated or installed at Aviron's cost unless Evans
          chooses to purchase such equipment at a price to be negotiated at that
          time. At the point of Evans purchasing such equipment from Aviron, all
          Aviron's responsibility under the terms of this clause stop. Should
          Aviron fail to remove the equipment and make good any damage within
          the ninety day period, Evans may arrange, all at Aviron's cost,
          disposal of the said equipment and repair and restoration of the said
          premises.

3.   TECHNICAL AGREEMENT

    3.1.  The respective responsibilities of Evans and Aviron relating to the
          Manufacture of the Product, the way in which each batch of the Product
          has been Manufactured and checked for compliance with and adherence to
          the Technical Agreement, the responsibility for purchasing materials,
          testing and releasing materials and undertaking production and quality
          control including in-process controls as well as sampling and-analysis
          shall be as specified in the Technical Agreement (Schedule 1).

    3.2.  Evans shall be responsible for ensuring the safe operation of the
          process of Manufacture of the Product and in particular that the
          Technical Information supplied by Aviron can be safely used in Evans'
          premises. However, prior to Evans' obligations to Manufacture Product
          hereunder arising Aviron will supply Evans with all information in its
          possession at the time of such transfer regarding any hazardous
          aspects relating to Manufacture of the Product unless previously
          supplied to Evans. Should Evans consider in its reasonable opinion the
          said hazardous aspect to be unacceptable then it shall so notify
          Aviron in writing prior to undertaking the Manufacture and thereafter
          shall have the right not to proceed with the Manufacture of the
          Product until such hazardous aspect has been abated,

                                       8
<PAGE>
 
          if possible. If such abatement is not possible, this Agreement will
          terminate and the provisions of Clause 12.6 shall apply.

    3.3.  Aviron and Evans may request changes to the Technical Agreement from
          time to time. No changes will be made unless agreed by both parties.

4.   DURATION AND INTERPRETATION

     4.1.  Unless sooner terminated as provided under Section 12, this Agreement
           shall come into force on the Effective Date hereof and shall continue
           in force until the earlier of 31 December, 2000, or the date two (2)
           years following initial Product commercial sale. Provided that if the
           parties so agree on or before 30 April 1998, the Agreement may be
           extended to 31 December 2001.

     4.2.  Aviron and Evans entered into that certain Manufacturing and
           Development Agreement dated November 7, 1995 (the "Development
           Agreement") (attached as Schedule 4) and currently wish to enter into
           arrangements with regard to the further development and Manufacture
           by Evans of Bulk Monovalent Intermediates and/or cold adapted
           influenza vaccine. It is intended that the Development Agreement will
           run concurrently with this Agreement and that this Agreement will not
           subvert any obligations, commitments, or definitions in the
           Development Agreement.

5.   FORECAST AND SUPPLY

     5.1.  Upon the signing of this Agreement Aviron will provide a forecast of
           Product and manufacturing requirements for each year during the term
           of this Agreement. During the term of this Agreement Aviron will
           submit to Evans by March 1 of each year, a purchase order for
           Manufacture and dates for delivery of the Product for the following
           calendar year.

     5.2.  Prior to submission of the first purchase order, the parties will
           agree on the format of the purchase orders to be used under this
           Agreement. The nature of the services Evans shall perform and/or the
           Product to be provided to Aviron pursuant to this Agreement will be
           determined on a purchase order by purchase order basis and will be
           subject except where otherwise provided in this Agreement to the
           reasonable terms and conditions of sale of Evans.

     5.3.  Within ten (10) days of receipt of such purchase orders Evans shall
           notify Aviron in writing of its acceptance or otherwise of such
           purchase orders as binding orders or, if different, such confirmation
           shall indicate what portion of the amounts of Manufacture covered by
           such purchase orders Evans is willing to accept as a binding order.
           Dispatch of such confirmation shall constitute the acceptance of a
           binding order for the amounts of Manufacture covered by such
           confirmation. Such confirmation shall also confirm the delivery date
           or specify alternate delivery dates.

                                       9
<PAGE>
 
     5.4.  Evans will use its reasonable endeavors to supply to Aviron, at
           Aviron's request, additional Manufacturing in excess of that ordered
           or forecasted in accordance with this clause 5 having due regard for
           Evans' production capacity and other manufacturing commitments.

     5.5.  Evans will at the request of Aviron deliver the Product to any
           address as Aviron may specify but the Price for Production is Ex-
           Works (Speke) (as defined in Incoterms 1990) and Aviron shall bear
           the cost of delivery, insurance, export duties, and all such other
           costs, to any such address plus the cost of palletization.

     5.6.  Aviron may in accordance with this clause 5.6 reject any delivery of
           Product which does not conform with the Specifications. Any notice of
           rejection shall be in writing and shall indicate the reasons for such
           rejection. In order to reject delivery of the Product, Aviron must
           give written notice to Evans of its rejection of any delivery within
           thirty (30) days after receipt of such delivery. If no such notice of
           rejection is received, Aviron shall be deemed to have accepted such
           delivery of Product within thirty (30) days of delivery of the
           shipment. Once Aviron accepts a shipment of Product, Aviron shall
           have no recourse against Evans if the Product is subsequently deemed
           unsuitable for use for any reason, except as provided in Section 8
           below.

           If Aviron rejects any Product, Aviron shall cooperate with Evans in
           determining whether rejection is necessary or justified. Evans will
           evaluate process issues and other reasons for such non-compliance.
           Evans shall notify Aviron as promptly as reasonably possible whether
           it accepts Aviron's basis for any rejection. If Evans agrees with
           Aviron's determination that certain Product does not meet the
           Specifications, and promptly on receipt of a notice of rejection of a
           shipment of Product from Aviron, Evans shall use reasonable and
           timely efforts at Aviron's request to (i) replace such rejected
           Product subject to Aviron providing Evans with such free issue
           materials (such as Virus Seeds) as may be required to carry out such
           Manufacture; or (ii) credit Aviron's account in an amount equal to
           the amount paid by Aviron to Evans for Product determined not to meet
           the relevant specifications. If Evans disagrees with Aviron's
           determination that certain Product does not meet the Specifications,
           promptly on receipt of a notice of rejection of a shipment of
           Product, Evans shall use reasonable and timely efforts at Aviron's
           request to replace such rejected Product. The rejected Product shall
           be submitted to a mutually acceptable, third party laboratory, which
           shall determine whether such Product meets the Specifications. The
           parties agree that such laboratory's determination shall be final and
           binding. The party against whom the third .party tester rules shall
           bear all costs of the third party testing. If the third party tester
           rules that the Product meets Specifications, Aviron guarantees to
           purchase such Product at the Price for Production, irrespective of
           whether Evans has already replaced it. If the third-party tester
           rules that the Product does not meet Specifications and the Product
           was not replaced, Evans shall credit Aviron's

                                      10
<PAGE>
 
          account in an amount equal to the Price for Production of the rejected
          Product or refund that sum to Aviron.

6.  INTELLECTUAL PROPERTY AND IMPROVEMENTS

    6.1.  Aviron hereby authorizes Evans to use the Trade Marks on a non-
          exclusive basis solely in connection with packaging Vaccine pursuant
          to and during the term of this Agreement. Evans shall not at any time
          do or permit any act to be done which may in any way impair the rights
          of Aviron in the Trade Marks. In order to comply with Aviron's quality
          control standards with respect to the Trade Marks, Evans shall (i) use
          the Trade Marks in compliance with all relevant laws and regulations;
          and (ii) not modify any of the Trade Marks in any way and not use any
          of the Trade Marks on or in connection with any goods or services
          other than the Vaccine.

    6.2.  Except as expressly provided in this Agreement, each party hereby
          acknowledges that it shall not acquire any rights in respect of any of
          the other party's intellectual property in relation to the Products or
          the Manufacture thereof or of the goodwill associated therewith.

    6.3.  Other than as is necessary for the proper performance of this
          Agreement by the parties, or as is expressly provided in this
          Agreement or the Development Agreement, no license, expressed or
          implied, is granted by this Agreement by either party to the other
          under any of its intellectual property rights.

    6.4.  Title to and property in all Manufacturing Records shall be and remain
          at all times exclusively vested in Evans. Title to and property in
          Process Improvements and other process technology is as follows:

          6.4.1.  Evans acknowledges and agrees that process technology specific
                  solely to the Vaccine and developed by Evans in the course of
                  this Agreement shall be [*]. All Process
                  Improvements developed by Evans pursuant to this Agreement
                  shall be [*];

          6.4.2.  in respect of Process Improvements developed by Evans pursuant
                  to this Agreement which is the property of Evans, [*] 


                                      11
[*] = Certain information on this page has been omitted and filed separately 
    with the Commission. Confidential treatment has been requested with respect
    to the omitted portions.
<PAGE>
 
                  [*];

     6.5  The Manufacturing Records shall be treated as Restricted Information
          of Evans and shall not be used by Aviron other than for the purposes
          associated with Manufacture of the Product and where necessary for
          disclosing to the relevant Agency in order to comply with regulatory
          requirements relating to the Product and its Manufacture by Evans.
          Aviron may request to retain a copy of all Manufacturing Records, for
          the purposes of complying with the requirements of the relevant
          Agency, to which request Evans may not unreasonably withhold its
          consent. Aviron may disclose the Restricted Information to the
          relevant Agency, having previously made reasonable efforts to obtain
          an obligation of confidentiality from the said Agency concerning the
          Restricted Information

7.   PRICES

     7.1. All orders for Product and Manufacture during the term of this
          Agreement will (subject as provided in this clause 7.1 and clause 7.3
          below) be at the Price for Production defined in Schedule 2. Upon
          annual review by the parties, the Price for Production may be
          increased or decreased by the percentage increase or decrease (if any)
          in the Producers Price Index for the immediately preceding twelve (12)
          month period for the location of Manufacture. In addition, Evans may
          propose to Aviron an annual increase in the Price for Production to
          take account of any increased Manufacturing costs which are specific
          to the Product including cost of materials, provided, however, that
          Evans shall consult with Aviron concerning such price increase and
          must provide, to Aviron's reasonable satisfaction, sufficient
          documentation to support its proposed increase in the Price for
          Production.

    7.2.  Invoices will be submitted to Aviron monthly to cover the Price for
          Production for the preceding month of Manufacture. Aviron will pay to
          Evans the full invoice amount for the Price for Production within
          thirty (30) days after the date of the invoice. If Aviron so requires,
          payment will be made direct into Evans' bank account by bank transfer
          and upon written request by Aviron, Evans will provide Aviron with the
          necessary details of Evans' bank account and will take whatever
          actions are necessary to facilitate payment by bank transfer.

    7.3.  If as a result of any inspection of Evans' facilities and
          manufacturing operations and records as referred to in clause 2.3.4,
          or otherwise a requirement is imposed which leads to a material change
          in the Price for Production or to the Technical Agreement of the
          Product, then upon written notification by Evans to Aviron, Evans and
          Aviron will meet to discuss any increase or decrease to the Price for
          Production of the Product deemed appropriate and the date upon which
          such price increase will take effect as well as other consequences
          arising from such changes. If as a consequence of such a material
          change either party is unable to fulfill its 

                                      12
[*] = Certain information on this page has been omitted and filed separately 
    with the Commission. Confidential treatment has been requested with respect
    to the omitted portions.
<PAGE>
 
          obligations under the terms of this Agreement this may by mutual
          agreement of both Evans and Aviron initiate negotiations of a revision
          to this Agreement.

8.  INDEMNITY

    8.1.  Aviron shall be liable for and shall indemnify Evans against:

          8.1.1.  all claims for loss or damage arising from the supply or use
                  or Manufacture of Virus Seed or Product except to the extent
                  that such claims, loss or damage arise as a consequence of
                  Evans' negligence or through unauthorized deviation from the
                  Technical Agreement in which case Evans shall be liable for
                  direct losses incurred, and shall indemnify Aviron
                  accordingly; and

          8.1.2.  all claims, loss or damage arising as a consequence of any
                  allegations of Michigan against Evans or any claims by
                  Michigan against Evans whether or not under any indemnity
                  provided by Evans to Michigan hereunder, provided, however
                  that Evans was at all times in material compliance with the
                  terms of this Agreement, and that such claims, loss or damage
                  did not arise as a result of Evans' negligence or unauthorized
                  material deviation from the Technical Agreement.

    8.2.  Evans shall be liable for any loss of or damage to Aviron Assets,
          materials, components or Product arising from Evans' negligence whilst
          at Evans risk up to replacement value.

    8.3.  Each party undertakes to ensure that it has in place product liability
          insurance with a reputable insurer in an amount appropriate for its
          business and Products of the type the subject of this Agreement. At
          either party's request, the other party shall provide the requesting
          party with evidence of the existence and maintenance of such coverage.

    8.4.  Aviron shall disclose to Evans all health, safety, and environmental
          issues at any time regarding the Product known by Aviron to be
          required for Manufacture.

    8.5.  Notwithstanding anything contained in this Agreement, Evans' liability
          in contract tort (including breach of statutory duty) or otherwise
          arising by reason of or in connection with this Agreement or any
          agreement or indemnity contemplated hereunder (except in relation to
          death or personal injury caused by the negligence of Evans or its
          employees while acting in the course of their employment) shall be
          limited to the lesser of (Pounds)1,000,000 or the revenue earned by
          Evans and paid by Aviron under this Agreement in the 12 month period
          prior to the event giving rise to such liability.

    8.6.  In no event, and notwithstanding anything contained in this Agreement,
          shall either party be liable in contract tort (including breach of
          statutory duty) or 

                                      13
<PAGE>
 
          otherwise howsoever, and whatever the cause thereof, for any special,
          indirect or consequential loss, damage costs or expenses of any nature
          whatsoever.

     8.7  All indemnities under this agreement given by either party shall be
          subject to English common law duties and defenses including without
          limitation, the duty to mitigate, contributory negligence, and issues
          of causation and remoteness.

9.   CONFIDENTIALITY

     9.1. On the expiry or termination of this Agreement, Recipient will return
          to Discloser all Restricted Information of Discloser in its possession
          and the Recipient shall have the option to retain one (1) copy, but
          shall not make any further use of that information.

    9.2.  In this Clause references to the Discloser or Recipient shall be
          deemed to include any Associated Companies of that party.

    9.3.  The Recipient undertakes to keep confidential all Restricted
          Information received by it directly or indirectly from the Discloser
          or obtained by it pursuant to the performance of this Agreement and
          not to use such Restricted Information except as provided in this
          Agreement. The obligations set forth in this Clause 9.3 shall apply
          during the period of this Agreement and for a period of the longer of
          (i) ten (10) years after the termination or expiry of the Michigan
          Agreement or (ii) ten (10) years after the termination of this
          Agreement.

    9.4.  Recipient shall allow access to the Discloser's Restricted Information
          exclusively to those of its employees who have reasonable need to see
          and use it for the purposes of this Agreement and shall inform each of
          such employees of the confidential nature of the Restricted
          Information and of the obligations on the Recipient with respect to
          such Restricted Information and shall ensure that each of its
          employees having access to the Restricted Information is contractually
          bound by obligations of confidentiality and shall take such steps as
          may be necessary to enforce such obligations.

10.  LIAISON

     Upon signature of this Agreement the parties will each identify in writing
     the person responsible for the day to day operation of this Agreement
     including production planning relating to forecast requirements. The person
     responsible may be changed from time to time with written notification to
     the other party.

11.  CHANGE OF CONTROL

     Neither party may assign any of its rights or delegate any of its
     obligations under this Agreement (other than by Evans to its Associated
     Companies or Aviron to its Associated Companies as the case may be, or in
     the event of a merger or consolidation of a party 

                                      15
<PAGE>
 
     with or into any other entity, including a triangular merger involving such
     party or a sale of all or substantially all of the assets or business unit
     to which this Agreement relates) without the prior written consent of the
     other party, except as expressly provided herein.

     This Agreement shall be binding upon and shall inure to the benefit of
     Evans and Aviron and their respective permitted successors and assignees
     (if any). The parties acknowledge and agree that any change of ownership or
     control of either Evans or Aviron shall not affect, either at law, or as
     between the parties, that party's rights and obligations under this
     Agreement, to the extent that the party undergoing such change of ownership
     or control survives such change of ownership or control.

     Each party ("the Changing Party") shall forthwith notify the other if there
     is an effective change of ownership or control of the Changing Party; or if
     the Changing Party sells all or substantially all of the assets or all or
     substantially all of the business to which this Agreement relates. In the
     case where [*] is the Changing Party, within a period. of four (4) calendar
     months of receipt of such notice or actual sale, should [*] in its
     reasonable opinion decide that the party assuming effective ownership or
     control of, or purchasing the assets or business of [*] is [*] of
     [*] or a party [*] [*] may by a further four (4) weeks' notice [*].

     Any purported assignment in violation of this section by either party shall
     be voidable by the other party.

12.  TERMINATION

     12.1. Either party shall be entitled forthwith to terminate this Agreement
           by written notice to the other if:

           12.1.1.that other party is in material breach of any of the
                  provisions of this Agreement and, in the case of a material
                  breach capable of remedy, fails to remedy the same within
                  thirty (30) days of receipt of a written notice specifying the
                  material breach and requiring its remedy; or

           12.1.2.an encumbrancer takes possession or a receiver is appointed
                  over any of the property or assets of that other party; or

           12.1.3.the other party becomes subject to an administration order; or

           12.1.4.that other party goes into liquidation except for the purposes
                  of amalgamation or reconstruction and in such manner that the
                  company resulting therefrom effectively agrees to be bound by
                  or assumes the obligations imposed on that other party under
                  this Agreement.

                                      15

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    with the Commission. Confidential treatment has been requested with respect
    to the omitted portions.
<PAGE>
 
           12.1.5.that other party is the subject of any proceeding or order or
                  other event in any applicable jurisdiction which would have an
                  effect analogous to any of the events mentioned in Clauses
                  12.1.2 to 12.1.4 above.

    12.2. For the purposes of clause 12.1.1 a material breach shall be
          considered capable of remedy if the party in breach can comply with
          the provision in question in all respects other than as to the time of
          performance provided that time of performance is not of the essence.

    12.3. Any waiver by either party of a breach of any provision of this
          Agreement shall not be considered as a waiver of any subsequent breach
          of the same or any other provision thereof.

    12.4. The rights to terminate this Agreement given by this Clause shall be
          without prejudice to any other right or remedy of either party in
          respect of the material breach concerned (if any).

    12.5. Upon termination of this Agreement for breach by Evans, Evans shall
          provide to Aviron all Manufacturing data and information necessary to
          permit a competent manufacturer to Manufacture the Product and Aviron
          may use such data and information or disclose it to a third party
          manufacturer under an obligation of confidentiality for the purpose of
          Manufacturing the Product.

    12.6. On expiration or termination of this Agreement for any reason:

          12.6.1.Evans shall, at its option, immediately cease Manufacture of
                 the Product or complete the Manufacture of the Product then in
                 the course of Manufacture, provided, however, that if such
                 termination is made at Aviron's election, Aviron shall
                 determine whether Evans shall cease Manufacture immediately or
                 complete Manufacture of the Product then in the course of
                 Manufacture;

          12.6.2.subject to 12.6.1 each party shall deliver up to the other all
                 materials, reports, and other documents (including copies
                 thereof) in its possession or control containing Restricted
                 Information of the other party, and each will cease to make use
                 of the others Restricted Information;

          12.6.3.Aviron shall pay outstanding invoices or invoices due to be
                 raised according to terms specified in this Agreement. In the
                 event Evans shall exercise its option under 12.6.1 above not to
                 complete the Manufacture of the Product, then such unfinished
                 Product shall be paid for at a price to be agreed or failing
                 agreement at the price equal to the Price for Production
                 incurred up to the time Manufacture was discontinued;

          12.6.4.Aviron will be obliged to purchase and Evans will be obliged to
                 supply all stocks of Raw Materials purchased by Evans in
                 support of purchase orders

                                      16
<PAGE>
 
                 or forecasts submitted by Aviron at a price to be agreed or
                 failing agreement within a reasonable time, at Manufacturer's
                 cost;

          12.6.5.Aviron will collect all Raw Materials supplied to Evans free of
                 charge save for any Raw Materials required to complete the
                 Manufacture of the Product in the event of Evans exercising its
                 option to complete such Manufacture under 12.6.1 above.

          12.6.6.Termination of this Agreement for any reason shall not bring to
                 an end any provisions of this Agreement which, in order to give
                 effect to their meaning, need to survive its termination and
                 such provisions shall remain in full force and effect
                 thereafter and in particular but without limiting the scope of
                 foregoing the obligations of the parties under clauses 8, 9,
                 and this clause 12.

          12.6.7.Upon cessation or completion of the Manufacture of the Product
                 Evans shall return to Aviron or destroy all Master Strains,
                 Virus Seeds and related material as instructed by Aviron.

                 To the extent that this Agreement terminates pursuant to clause
                 4.1 and/or clause 12 and results in Evans having to terminate
                 the employment of any employee working specifically on the
                 Manufacture of the Product and Evans is required to make
                 payments to such employee in connection with such termination
                 of employment ("Severance Payment"), then Aviron will pay to
                 Evans the Severance Payment incurred by Evans for each
                 employee. In no event shall Aviron's payment exceed thirty
                 percent (30%) of each such employee's annual base salary. Evans
                 shall make a good faith effort to redeploy such employee before
                 terminating such employee's employment. Evans shall keep
                 complete and accurate records pertaining to (i) the allocation
                 of such employees to work specifically on the Manufacture for
                 Aviron, (ii) Evans' good faith efforts to redeploy such
                 employee and (iii) the accuracy of the Severance Payments made
                 to such employee. Aviron shall have the right to audit such
                 records to confirm the accuracy of the Severance Payment made
                 hereunder.

13.  ASSOCIATED COMPANIES

     Evans shall be entitled to perform any of the obligations undertaken by it
     and to exercise any of the rights granted to it under this Agreement
     through any of its Associated Companies with Aviron's consent, such consent
     not to be unreasonably withheld, and any act or omission of any such
     company shall for the purposes of this Agreement be deemed to be the act or
     omission of Evans. For the purposes of such delegated performance Evans
     shall be entitled to disclose only on a need to know basis Aviron's
     Restricted Information to employees of relevant Associated Companies.

                                      17
<PAGE>
 
14.  FORCE MAJEURE

     14.1.  If either party is affected by Force Majeure it shall forthwith
            notify the other party of the nature and extent thereof. The
            affected party shall additionally at its own cost and expense take
            all reasonable steps as may be necessary to overcome the Force
            Majeure and to minimize its effects.

     14.2.  Neither party shall be deemed to be in breach of this Agreement, or
            otherwise be liable to the other by reason of any delay in
            performance, or non-performance, of any its obligations hereunder to
            the extent that such delay or non-performance is due to any Force
            Majeure of which it has notified the other party and the time for
            performance of that obligation shall be extended accordingly.

     14.3.  All Price for Production incurred up to the suspension due to Force
            Majeure are to be paid by Aviron.

     14.4.  The party affected by Force Majeure shall give notice to the other
            party as soon as practical after the matter constituting Force
            Majeure has arisen or occurred giving the other party full
            particulars of the nature and extent of such matter.

     14.5.  In the event of any Force Majeure occurrence the parties shall
            consult with a view to determining what steps they may agree to
            take, appropriate to the Force Majeure circumstances, in relation to
            this Agreement.

15.  NOTICES

     15.1.  Any notices or other information required or authorized by this
            Agreement to be given by either party to the other may be given by
            hand or sent to the other by first class registered pre-paid post,
            telex, facsimile transmission or comparable means of communication.
            The same shall be sent or delivered to the other party at the
            address shown for that party at the beginning of this Agreement or
            to such other address which may be notified in writing to the other
            party from time to time. Six (6) days should be allowed for
            delivery.

     15.2.  Any notice or other information given by post pursuant to clause
            15.1 which is not returned to the sender as undelivered shall be
            deemed to have been given on the third day after the envelope
            containing the same was so posted. Proof that the envelope
            containing any such notice or information was properly addressed,
            pre-paid, registered and posted, and that it has not been so
            returned to the sender, shall be sufficient evidence that such
            notice or information has been duly given.

     15.3.  Any notice or other information sent by telex, facsimile
            transmission or comparable means of communication shall be deemed to
            have been duly sent on the date of transmission, provided that a
            confirming copy thereof is sent by first class registered pre-paid
            post to the other party at the address referred to in clause 15.1
            within twenty-four (24) hours after transmission.

                                      18
<PAGE>
 
16.  MICHIGAN LICENSE

     Evans accepts:

     16.1.  The Virus Seeds or the Working Seeds may be used only for the
            Manufacture of Product; and

     16.2.  Evans shall not provide any Virus Seeds, Working Seeds or
            derivatives thereof to any third party. Evans shall limit access to
            the Virus Seed supplied by Aviron and Working Seeds made by Evans to
            those employees reasonably requiring such access for the purpose of
            Development and Manufacture of the Product, which employees are
            governed by Evans' customary confidentiality obligations.

     16.3.  Aviron shall:

            16.3.1.use every reasonable effort to honor and observe its
                   obligations under the Michigan Agreement and shall not act or
                   fail to act in any way which might jeopardize or cause to be
                   terminated the Michigan Agreement; and,

            16.3.2.promptly notify Evans of any amendment to the Michigan
                   Agreement; and,

            16.3.3.make every reasonable effort to notify Evans in writing of
                   the expiry or termination of the Michigan Agreement at least
                   six weeks prior to either event.

     16.4.  Evans will use every reasonable effort to Manufacture and store the
            Virus Seeds and Product in accordance with all applicable government
            laws and regulations.

     16.5.  Aviron, on Michigan's behalf, may request from Evans at reasonable
            times and in reasonable quantities at a cost equal to Evans' Price
            for Production of Product as it may desire, PROVIDED THAT Evans
            shall be under no obligation under this sub-clause or otherwise to
            produce extra batches of Product solely or substantially to meet
            Michigan's requirements. Any requirements of Michigan shall be
            supplied from Product Manufactured for Aviron with Aviron being
            solely responsible for apportioning such part thereof to Michigan as
            Aviron sees fit.

     16.6.  Evans acknowledges Michigan's warranty disclaimer and limitation of
            liability contained in the Michigan Agreement but makes no
            assessment or admission of its validity or reasonableness.
            Notwithstanding such, Evans will not make any statements,
            representations or warranties inconsistent with such warranty
            disclaimer or limitation of liability other than in pursuance or
            prosecution of its own rights and remedies.

     16.7.  Subject to those limitations of liability contained in clauses 8.5
            and 8.6, hereof, and subject to 8.1.2, Evans will indemnify
            Michigan, its fellows, officers,

                                      19
<PAGE>
 
            employees and agents for and against any and all claims, damages,
            losses and expenses of any nature resulting from, but not limited
            to, death, personal injury, illness or property damage, arising
            directly and solely as a result of:

            16.7.1.any Manufacture, use or other disposition by Evans of the
                   Virus Seeds or Product;

            16.7.2.the use by Evans, its agents or employees of Virus Seeds or
                   Product made or used by Evans;

            16.7.3.the use, handling, storage or disposal of Virus Seeds, any
                   derivatives or Product by Evans; or

            16.7.4.the unauthorized and negligent use by Evans of any know-how,
                   or technical data sub-licensed to Aviron from Michigan (and
                   of which know-how and technical data Aviron has expressly
                   notified Evans as being sub-licensed to Aviron by Michigan)
                   or developed by Evans pursuant to the Manufacture,

            where but only where such claims, damages, losses and expenses are a
            direct consequence of the negligence of Evans, its agents or
            employees.

     16.8.  Evans shall not use the name of Michigan in publicity or advertising
            concerning the Product the Virus Seed without the prior written
            consent of Michigan, such consent not to be unreasonably or
            arbitrarily withheld nor delayed. Reports in scientific literature
            and presentations of joint research and development work are not
            considered publicity for the purpose of this clause.

17.  GENERAL

     17.1.  No variation or amendment of this Agreement shall bind either party
            unless made in writing in the English language and agreed to in
            writing by duly authorized officers of both parties.

     17.2.  If any provision of this Agreement is agreed by the parties to be
            illegal void or unenforceable under any law that is applicable
            hereto or if any court of competent jurisdiction in a final decision
            so determines this Agreement shall continue in force save that such
            provision shall be deemed to be excised here from with effect from
            the date of such agreement or decision or such earlier date as the
            parties may agree.

     17.3.  This Agreement shall be governed by and construed in all respects in
            accordance with the Laws of England. Either party shall be entitled
            to enforce any order of the English Courts in any other
            jurisdiction.

                                      20
<PAGE>
 
     17.4.  If there is a provision of this Agreement, or of any agreement or
            arrangement of which this agreement may form part, which causes or
            would cause this agreement or any other agreement or arrangement to
            be subject to registration under the Restrictive Trade Practices Act
            1976 (as amended), then that provision shall not take effect until
            the date after particulars of this agreement (or of that agreement
            or arrangement, as the case may be) have been furnished to the
            Director General of Fair Trading pursuant to section 24 of the
            Restrictive Trade Practices Act 1976 (as amended).

18.  PUBLIC DISCLOSURE

     No public announcement of any kind shall be made in respect of or in
     connection with this Agreement except as specifically agreed in writing
     between the parties, or except to the extent that an announcement is
     required by law or by the US or UK stock exchange as the case may be but in
     such event any announcement by either party shall only be issued after
     prior consultation with the other, having taken reasonable account of any
     comment or reasonable requirement of the other.

                                      21
<PAGE>
 
IN WITNESS whereof this Agreement has been executed by the duly authorized
representatives of the parties the day and year first above written

Signed:                           /s/  John Ferguson
                                --------------------

FOR AND ON BEHALF OF
EVANS MEDICAL LIMITED
- ---------------------

Signed:                           /s/  Leighton Read
                                --------------------

FOR AND ON BEHALF OF
AVIRON
- ------


                                      22
<PAGE>
 
                                   SCHEDULE 1
                                   ----------

                              TECHNICAL AGREEMENT
                              -------------------

1.   Cold Adapted Influenza Vaccine
<PAGE>
 
                              TECHNICAL AGREEMENT
                            FOR CONTRACT MANUFACTURE

BETWEEN                  EVANS MEDICAL LIMITED ("EVANS"), WHOSE REGISTERED
                         OFFICE IS AT EVANS HOUSE, REGENT PARK, KINGSTON ROAD,
                         LEATHERHEAD, SURREY, KT22 7PQ, UNITED KINGDOM.

AND                      AVIRON (A DELAWARE CORPORATION), ("AVIRON"), WHOSE
                         REGISTERED OFFICE IS AT 297 NORTH BERNARDO AVENUE,
                         MOUNTAIN VIEW, CALIFORNIA 94043, UNITED STATES OF
                         AMERICA.

                                       EVANS AND AVIRON ARE THE "PARTIES".

IT IS AGREED THIS 1ST DAY OF MAY 1997

1.   BACKGROUND
     ----------

     The Parties have entered into a Manufacturing and Development Agreement,
     effective November 7, 1995, (the "Development Agreement") to provide for
     the production of cold adapted influenza vaccine.  Material produced under
     the Development Agreement is to be used primarily for development research
     and Phase I, II and early Phase III clinical trials.

     In addition, the Parties have entered in to a Contract Manufacturing
     Agreement, effective April 1, 1997 (the "Manufacturing Agreement"), for the
     production of commercial quantities of cold adapted influenza vaccine.
     This Technical Agreement for Contract Manufacture (the "Technical
     Agreement") is attached as Schedule I to the Manufacturing Agreement.
     Definitions adopted in the Manufacturing Agreement will govern the
     Technical Agreement.

     Under the Technical Agreement, Evans will be responsible for the
     Manufacture of the Products, as ordered by Aviron and specified in Appendix
     I ("the Products"), in accordance with Specifications agreed in writing
     with Aviron in Appendix II ("Specifications"), and in accordance with the
     contained in the United States 21 Code of Federal Regulations Part 210 and
     211.  The Specifications may be changed from time to time by mutual
     agreement of the Specifications Working Group ("SWG") as defined in Section
     7.0 below.

2.   COMPETENCE
     ----------

     Aviron hereby declares and agrees that it has assessed and is satisfied
     with the competence and ability of Evans to undertake and complete
     successfully the work contemplated by this Agreement.  Such declaration is
     not a waiver of Aviron's rights under any other agreements between Evans
     and Aviron.
<PAGE>
 
3.   STARTING MATERIALS AND PACKAGING MATERIALS SOURCED BY EVANS
     -----------------------------------------------------------

     3.1. Evans will be responsible for ensuring that each batch of Raw
          Materials and Packaging Materials (other than those supplied by
          Aviron) complies with the Specifications. "Raw Materials" are defined
          as any component required for the Manufacture and quality control of
          the Products. "Packaging Materials" are defined as any component
          accompanying the Vaccine as it is provided to Aviron or designated
          recipient.

     3.2. Evans will ensure that Raw Materials and Packaging Materials (other
          than those supplied by Aviron) are only sourced from suppliers that
          satisfy all requirements of the Specifications.

4.   MANUFACTURING INSTRUCTIONS
     --------------------------

     Evans will supply to Aviron a master copy of the relevant Manufacturing
     Records for Aviron to authorize and approve in writing as being consistent
     with the Specifications and the Agency Approval for the Product prior to
     the said documents being used.  Significant changes to such documents
     similarly will be agreed prior to implementation.

5.   QUALITY CONTROL
     ---------------

     5.1. Aviron will supply to Evans Virus Seed or Working Seed and associated
          documentation to confirm that the said Virus Seed and Working Seed is
          suitable for Manufacture of Products.

     5.2. Evans shall be responsible for carrying out appropriate quality
          control of the Raw Materials, except those items agreed to in writing
          by the Parties, to ensure that the Raw Materials comply with the
          Specifications.

     5.3. Evans shall be responsible for carrying out appropriate quality
          control on the Product to ensure that the Product complies with the
          Specifications.

     5.4. Notwithstanding anything contained in this Agreement, provided that
          Evans shall not be in material breach of its obligations under this
          Agreement, Aviron shall be solely responsible for the Products and any
          Raw Material provided by Aviron in respect of its safety efficacy or
          fitness for purpose.

6.   INFORMATION PROVIDED BY AVIRON
     ------------------------------

     Aviron represents that it has provided or intends to provide to Evans
     promptly and in good time prior to such information being required in
     carrying out work in relation to the Product, all information of which it
     is aware, and which is in Aviron's possession, and is reasonably necessary
     to undertake the work contemplated by this Agreement.  Aviron further
     represents that to the best of it's knowledge it has disclosed to Evans all
     problems 
<PAGE>
 
     and hazards posed to Evans' premises, equipment, personnel other products
     or materials and specific to the Product or its manufacture. To comply with
     the terms of this clause and to enable Evans to perform its obligations,
     Aviron confirms that the Specifications will include, directly or by
     reference, the following information (unless the parties have agreed that
     any such information is not relevant to the work being performed by Evans)
     for each of the Products.

     a)  The Manufacturing methods as set out in the relevant Product License
         once approval has been granted by the relevant Agency.

     b)  In process test procedures (if any) as set out in the said Product
         Licenses.

     c)  Raw Material, Virus Seed and Product Specifications including Working
         Seed named suppliers and all relevant testing methods as set out in the
         said Product Licenses.

     d)  Packaging material specifications as set out in the said Product
         Licenses, including artwork in the event of Evans being responsible for
         purchase of such materials.

     e)  Information on the known hazards of the formulation Raw Materials
         supplied by Aviron (if any).

     f)  Where such information is included by reference Aviron confirms that it
         intends to supply to Evans accounts and complete copies of documents
         containing such information.

7.   CHANGES IN STANDARDS, SPECIFICATIONS AND/OR PROCEDURES
     ------------------------------------------------------

     Within 60 days of executing the Technical Agreement, the Parties will form
     a Specifications Working Group ("SWG").  The purpose to the SWG shall be to
     review and adopt the Specifications that govern the Manufacturing
     Agreement.

     The SWG shall be comprised of two (2) members from each of the Parties,
     appointed and substituted for each Party as necessary from time to time.
     The Chairperson of the SWG shall be named by Aviron from among the SWG
     members.  Decision of the SWG shall be unanimous.  In the event the SWG is
     unable to reach a unanimous decision, or in the event of any controversy or
     claim arising out of or referring to any Specification that can not be
     resolved by the SWG, the SWG shall refer the disputed matter to the
     appointed senior executive of Evans and Aviron.

     Evans and Aviron will each nominate a senior representative to the SWG.
     The senior representatives will have the authority to approve
     Specifications on behalf of Evans or Aviron, respectively.  All
     Specifications established by the SWG will be reduced to writing, signed on
     behalf of the Parties by the senior representatives and appended to this
     Technical Agreement in Appendix II.  The SWG will be responsible for the
     timely 
<PAGE>
 
     adoption of all Specifications necessary for all regulatory filings in
     areas intended for commercial sale of the Product by Aviron or its
     designee/nominee.

     As a reference for the SWG the Parties have appended Specification adopted
     under the Development Agreement.  The Parties recognize that Specifications
     necessary under the Manufacturing Agreement will be different from, and
     more extensive than, the Specifications of the Development Agreement.

     7.1.  Evans will notify Aviron of any proposed changes in the standards,
           Specifications and/or processes for Manufacture of the Product, and
           Such changes will be agreed upon by the SWG and shall be verified in
           writing prior to the change being introduced.

     7.2.  Aviron will ensure that Evans is informed promptly of any changes
           that are to be made to the terms of the Product Licenses for the
           Products which may require a change to the Specifications and such
           changes when approved in writing by the SWG shall be deemed to be an
           amendment to the Specifications for the purposes of this Agreement.

8.   REWORKED AND REJECTED PRODUCTS
     ------------------------------

     Before Manufacture under the terms of the Manufacturing Agreement both
     Parties will appoint one (1) representative each from operations,
     manufacturing, regulatory affairs, quality assurance and quality control to
     serve on the Product Evaluation Team, ("PET"). The purpose of the PET is
     to investigate all incidences of the Product non-compliance to the
     Specifications.  The chairperson of the PET will be designated by Aviron
     from among the PET members and membership can be changed from time to time
     by the respective Party.  The report and recommendation of the PET will be
     communicated to the responsible persons of the respective Parties in
     Quality Assurance.

     8.1.  Evans will not subject any Products Manufactured by it under this
           Agreement to any re-processing unless it uses a method agreed to by
           Aviron.

9.   AVIRON RELEASE OF PRODUCT
     -------------------------

     9.1.  Aviron's Responsible Head is responsible for release of the Products.
           Evans will supply to Aviron a Certificate of Analysis and all
           relevant batch documentation as provided for in the Specifications to
           allow Aviron's Responsible Head to perform the release. Responsible
           Head is defined as "Aviron's designated senior executive or assignee
           responsible for review of documentation and release of Product". Each
           Party will designate a quality assurance person to be responsible for
           review of documentation and recommend release of Product to
           Responsible Head. The quality assurance person may be changed from
           time to time with written notification to the other Party.
<PAGE>
 
10.  BATCH DOCUMENTATION
     -------------------

     10.1.  Evans will keep under safe and secure storage the manufacturing,
            packaging and quality control and quality assurance records for each
            batch of Product for a period of seven (7) years. Evans must ensure
            this documentation is available for inspection by authorized Aviron
            personnel at reasonable notice.

     10.2.  Evans will submit to Aviron, promptly following a written request
            from Aviron, copies of all the manufacturing, packaging, quality
            control and quality assurance records relating to the Products.

11.  AUDITS
     ------

     Aviron reserves the right in normal business hours (after giving reasonable
     written notice and causing minimum disruption to Evans' operations) to
     inspect areas of Evans' premises connected with the Products, Raw Materials
     and Packaging Materials.

12.  CUSTOMER COMPLAINTS
     -------------------

     Aviron will notify Evans of all complaints and adverse reactions associated
     with the use of Products.  Evans shall promptly supply to Aviron and Aviron
     shall promptly supply to Evans all information needed for the investigation
     of customer complaints, adverse event or other concerns with respect to the
     quality of the Products.  The responsibility to reply to the customer will
     be with Aviron.

13.  RECALLS
     -------

     The decision to initiate a recall must rest with Aviron unless an
     appropriate regulatory authority requires a batch recall to be implemented.
     In any case the Responsible Head of Aviron must receive all essential
     information from Evans.  In the event Evans disagrees with Aviron's
     decision to not conduct a recall, Aviron assumes liability for claims
     arising from the Product batch in dispute.

14.  THE RETENTION OF SAMPLES
     ------------------------

     14.1.  A sample of finished Product, bulk active ingredients and starting
            materials (excluding solvents, gasses and water) will be retained
            and stored under conditions consistent with the product labeling. An
            accounting of the items, respective quantities and the duration for
            which they are to be stored, which may be amended from time to time,
            is attached as Appendix III. Evans will allow Aviron access to these
            samples on reasonable written notice in normal business hours.

     14.2.  The sample size of each batch of finished Product or active
            ingredient will be not less than twice the amount required to fully
            test the Product for compliance with Specification.
<PAGE>
 
     14.3.  Samples of finished Product and bulk active ingredients will be
            stored for one year beyond the expiry of the formulated product.

     14.4   Samples of starting materials will be kept for minimum of five years
            if their stability allows.

15.  DISPOSAL OF SAMPLES PRINTED PACKAGING MATERIALS AND REJECTED PRODUCT
     --------------------------------------------------------------------

     Samples, printed packing materials and rejected Product will be disposed of
     by Evans in a safe and controlled manner.

16.  SUB-CONTRACTING
     ---------------

     Evans shall not sub-contract any part of its obligations hereunder unless
     prior agreement and written authorization is obtained from Aviron.

IN WITNESS hereof this Agreement has been executed by the duly authorized
representatives of the parties the day and year first before written



SIGNED BY                     )
duly Authorized for and on    )     /s/  John Ferguson
behalf of EVANS               )
MEDICAL LIMITED               )
in the presence of:)          )



SIGNED BY                     )
duly Authorized for and on    )     /s/  Leighton Read
behalf of AVIRON              )
In the presence of:           )
<PAGE>
 
                            APPENDIX I - PRODUCT(S)
                            -----------------------
1.   Cold Adapted Influenza Vaccine

TO BE ESTABLISHED CONCURRENT WITH THE FDA LICENSE APPLICATION
- -------------------------------------------------------------











 
 
 
                                     SIGNATURE        DATE
- ------------------------------------------------------------
EVANS       Evans Medical Ltd.   /s/ John Ferguson   18/4/97
- ------------------------------------------------------------
AVIRON      Aviron               /s/ L. Read         24/4/97
- ------------------------------------------------------------
<PAGE>
 
                          APPENDIX II - SPECIFICATIONS
                          ----------------------------

VIRUS SEED SPECIFICATIONS
- ----------------------------------------
TO BE ESTABLISHED CONCURRENT WITH THE FDA LICENSE APPLICATION
- -----------------------------------------------------------------------------

WORKING SEED SPECIFICATIONS
- ----------------------------------------

TO BE ESTABLISHED CONCURRENT WITH THE  FDA LICENSE APPLICATION
- --------------------------------------------------------------


RAW MATERIAL & PACKAGING COMPONENT SUPPLY
- ----------------------------------------
<TABLE> 
<CAPTION> 

DESCRIPTION                                AVIRON TO SUPPLY   EVANS TO SUPPLY
- ----------------------------------------------------------------------------- 
<S>                                        <C>                <C> 
Active Ingredient                          [          

Eggs                                                

Excipients                                                            

Labels                                                      *

Syringes                                                     

Carton                                                                

Leaflet                                                                     ]

</TABLE> 

FINISHED PRODUCT TESTING
- ------------------------

Evans will test finished product with respect to the following specification:

Test                                         Specification
- ----                                         -------------

TO BE ESTABLISHED CONCURRENTLY WITH THE FDA LICENSE APPLICATION
- ---------------------------------------------------------------

                                          SIGNATURE        DATE
- ----------------------------------------------------------------
EVANS           Evans Medical Ltd.   /s/ John Ferguson   18/4/97
- ----------------------------------------------------------------
AVIRON          Aviron               /s/ L. Read         24/4/97
- ----------------------------------------------------------------

[*] = Certain information on this page has been omitted and filed separately 
    with the Commission. Confidential treatment has been requested with respect
    to the omitted portions.

<PAGE>
 
                        APPENDIX III - RETAINED SAMPLES
                        -------------------------------
         TO BE ESTABLISHED CONCURRENT WITH THE FDA LICENSE APPLICATION
         -------------------------------------------------------------





 
                                   SIGNATURE         DATE
- -------------------------------------------------------------
EVANS       Evans Medical Ltd.   /s/ John Ferguson   18/4/97
- -------------------------------------------------------------
AVIRON      Aviron               /s/ L. Read         24/4/97
- -------------------------------------------------------------
<PAGE>
 
                                   SCHEDULE 2
                                   ----------

                              PRICE FOR PRODUCTION
                              --------------------

                                    SUPPLIES
                                    --------

     Cost of supplies purchased for Aviron by Evans on a monthly basis will be
passed through to Aviron.

PERSONNEL
- ---------

     Cost for Evans personnel allocated to Aviron under this Agreement will be
charged monthly based upon involvement, at a defined [*] rate.  The
composition of staff allocated under this Agreement shall be no less than [*]
with previous influenza Commercial Manufacture experience or similar process.

PRIMARY PRODUCTION
- ------------------

[ * ] for Multi Purpose Bacterials              [ * ] per year.

[ * ] rate                                      [ * ] for an operative

                                                [ * ] for a supervisor/
                                                engineer/technical
                                                support person.

Egg waste disposal                              [ * ] per egg processed.

SECONDARY PRODUCTION
- --------------------

Cold Adapted Influenza Virus Vaccine in syringes [ * ] per dose.

Any Product supplied over [ * ] doses in a single year, commencing on 1
January of that year, will be at a price of [ * ] per dose, up to [ * ] doses.
Similarly, any Product supplied over [ * ] doses in a single
year, commencing on 1 January of that year, will be at a price of [ * ] per
dose.  The price will then revert to [ * ] per dose for the first [ * ] in the
following year.

[ * ] = Certain information on this page has been omitted and filed separately
with the Commission . Confidential treatment has been requested with respect to
the omitted portions.
<PAGE>
 
Example
- -----------------------------------------------

First Year          [ * ] ordered
                    [ * ] @ [ * ] = [ * ]
                    [ * ] @ [ * ] = [ * ]

                    TOTAL FOR FIRST YEAR = [ * ]


Second year         [ * ] ordered
                    [ * ] @ [ * ] = [ * ]
                    [ * ] @ [ * ] = [ * ]
                    [ * ] @ [ * ] = [ * ]

                    TOTAL FOR SECOND YEAR = [ * ]


NB:  All prices set out herein are subject to review in accordance with 
     Clause 7.

[ * ] = Certain information on this page has been omitted and filed separately
with the Commission . Confidential treatment has been requested with respect to
the omitted portions.
<PAGE>
 
                                   SCHEDULE 3
                                   ----------

                                  TRADE MARKS
                                  -----------

[Pursuant to an agreement between the parties, this Schedule will not be
completed until late 1997.]
<PAGE>
 
                                   SCHEDULE 4
                                   ----------

                             DEVELOPMENT AGREEMENT
                             ---------------------

[This Agreement was filed as Exhibit 10.8 to the Company's Registration
Statement on Form S-1, File No. 333-05209, filed June 5, 1996, as amended, which
is hereby incorporated by reference.]
<PAGE>
 
                                   SCHEDULE 5
                                   ----------

                               MICHIGAN AGREEMENT
                               ------------------

[This Agreement was filed as Exhibit 10.3 to the Company's Registration
Statement on Form S-1, File No. 333-05209, filed June 5, 1996, as amended, which
is hereby incorporated by reference.]
<PAGE>
 
                                   SCHEDULE 6
                                   ----------

                                AVIRON'S ASSETS
                                ---------------

[Pursuant to an agreement between the parties, this Schedule will not be
completed until late 1997.]


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