AVIRON
S-8, 1998-07-13
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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<PAGE>   1
     As filed with the Securities and Exchange Commission on July 13, 1998

                                                 Registration No. 333-

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                   ----------

                                    FORM S-8
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

                                   ----------

                                     Aviron
    ------------------------------------------------------------------------
             (Exact name of registrant as specified in its charter)

           Delaware                                      77-0309686
   -------------------------                         ---------------------
   (State of Incorporation)                           (I.R.S. Employer
                                                     Identification No.)
                                   ----------

    297 North Bernardo Avenue, Mountain View, CA 94043 Phone: (650) 919-6500
    ------------------------------------------------------------------------
                    (Address of principal executive offices)

                                   ----------

        1996 Equity Incentive Plan and 1996 Employee Stock Purchase Plan
    ------------------------------------------------------------------------
                            (Full title of the plans)

          J. Leighton Read, M.D., Chairman and Chief Executive Officer
    297 North Bernardo Avenue, Mountain View, CA 94043 Phone: (650) 919-6500
    ------------------------------------------------------------------------
            (Name, address, including zip code, and telephone number,
                   including area code, of agent for service)

                                   ----------

                                   Copies to:
                             Alan C. Mendelson, Esq.
                             Robert J. Brigham, Esq.
                               Cooley Godward LLP
                              Five Palo Alto Square
                               3000 El Camino Real
                            Palo Alto, CA 94306-2155
                                 (650) 843-5000

                                   ----------

                         CALCULATION OF REGISTRATION FEE

<TABLE>
<CAPTION>
=======================================================================================================================
                                                 PROPOSED MAXIMUM           PROPOSED MAXIMUM
 TITLE OF SECURITIES     AMOUNT TO BE          OFFERING PRICE PER          AGGREGATE OFFERING            AMOUNT OF
  TO BE REGISTERED        REGISTERED                SHARE (1)                   PRICE (1)            REGISTRATION FEE
<S>                      <C>                    <C>                           <C>                      <C>
Stock Options and
Common Stock (par
value $.001)             1,600,000 shares       $27.5625-30.8125              $48,975,000                $14,448
=======================================================================================================================
</TABLE>

(1)     Estimated solely for the purpose of calculating the amount of the
        registration fee pursuant to Rule 457(c) and (h)(1) of the Securities
        Act of 1933, as amended. The registration fee is based on (1) the actual
        option price of 100,000 shares granted under the 1996 Equity Incentive
        Plan (the "Incentive Plan"), (2) the estimated price of 1,400,000 shares
        available for grant under the Incentive Plan, and (3) the estimated
        price of 100,000 shares to be offered under the 1996 Employee Stock
        Purchase Plan (the "Purchase Plan"). The price per share and aggregate
        offering price of the 1,400,000 shares available for grant under the
        Incentive Plan and the 100,000 shares to be offered under the Purchase
        Plan are based upon the average of the high and low prices of
        Registrant's Common Stock on July 9, 1998 as reported on the Nasdaq
        National Market. The registration fee is calculated as follows:

<TABLE>
        <S>                          <C>                 <C>          <C>
        1996 Equity Incentive Plan   Offering Price       Offering    Registration Fee (Offering x 0.000295)

               100,000 shares           $27.5625         $ 2,756,250        $   813.09

               1,400,000 shares         $30.8125         $43,137,500        $12,725.56

        1996 Employee Purchase Plan

               100,000 shares           $30.8125         $ 3,081,250        $   908.97

                                                   Total Registration Fee: $14,447.62
</TABLE>
<PAGE>   2

                 INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

        The Registration Statement on Form S-8, filed by Aviron (the "Company")
with the Securities and Exchange Commission on November 27, 1996, SEC File No.
333-17029, is incorporated by reference into this Registration Statement.



                                    EXHIBITS

<TABLE>
<CAPTION>
EXHIBIT
NUMBER
<S>            <C>
3.1            Bylaws of the Company.(2)

3.2            Amended and Restated Certificate of Incorporation of the
               Company.(2)

4.1            Reference is made to Exhibits 3.1 and 3.2.

4.2            Specimen Stock Certificate.(1)

4.3            Warrant for Series A Preferred Stock, issued to The Mount Sinai
               School of Medicine of the City of New York.(1)

4.4            Warrant for Series A Preferred Stock, issued to The Mount Sinai
               School of Medicine of the City of New York.(1)

4.5            Warrant for Series A Preferred Stock, issued to The Mount Sinai
               School of Medicine of the City of New York.(1)

4.6            Warrant for Series A Preferred Stock, issued to The Mount Sinai
               School of Medicine of the City of New York.(1)

4.7            Investors Rights Agreement, dated July 18, 1995, among the
               Company and the investors named therein.(1)

4.8            Common Stock Purchase Agreement between the Company and Biotech
               Target, S.A., dated as of March 27, 1997.(3)

4.9            Rights Agreement between the Company and BankBoston, N.A., dates
               as of October 8, 1997.(4)

4.10           Registration Rights Agreement by and among Aviron, Morgan Stanley
               & Co., Bear Stearns & Co. Inc., Credit Suisse First Boston Corp.,
               and Hambrecht & Quist LLC, dated as of March 15, 1998.(5)

4.11           Indenture between Aviron and Marine Midland Bank, as Trustee
               dated as of March 15, 1998.(5)

4.12           Purchase Agreement by and among Aviron, Morgan Stanley & Co.,
               Bear, Stearns & Co. Inc., Credit Suisse First Boston Corp., and
               Hambrecht & Quist LLC, dated as of March 24, 1998.(5)

5.1            Opinion of Cooley Godward LLP.

10.9*          1996 Equity Incentive Plan.

10.11*         1996 Employee Stock Purchase Plan.
</TABLE>



                                       2
<PAGE>   3

<TABLE>
<S>            <C>
23.1           Consent of Ernst & Young LLP.

23.2           Consent of Cooley Godward LLP is contained in Exhibit 5.1 to this
               Registration Statement.

24.1           Power of Attorney is contained on the signature pages.
</TABLE>

*       Management Contract or Compensatory Plan or Agreement

(1)     Incorporated by reference to the correspondingly numbered exhibit to the
        Company's Registration Statement on Form S-1, File No. 333-05209, filed
        June 5, 1996, as amended.

(2)     Incorporated by reference to the correspondingly numbered exhibit to the
        Company's Quarterly Report on Form 10-Q, File No. 0-20815, for the
        quarter ended September 30, 1996, filed December 20, 1996.

(3)     Incorporated by reference to the correspondingly numbered exhibit to the
        Company's Quarterly Report on Form 10-Q, File No. 0-20815, for the
        quarter ended March 31, 1997, filed May 15, 1997.

(4)     Incorporated by reference to the correspondingly numbered exhibit to the
        Company's Quarterly Report on Form 8-K, File No. 0-20815, dated October
        8, 1997, and filed October 10, 1997.

(5)     Incorporated by reference to the correspondingly numbered exhibit to the
        Company's Registration Statement on Form S-3 (File No. 333-41649), filed
        December 7, 1997, as amended.




                                       3
<PAGE>   4

                                   SIGNATURES

        Pursuant to the requirements of the Securities Act of 1933, as amended,
the Registrant certifies that it has reasonable grounds to believe that it meets
all of the requirements for filing on Form S-8 and has duly caused this
Registration Statement to be signed on its behalf by the undersigned, thereunto
duly authorized, in the City of Mountain View, State of California, on
July 10, 1998.


                                    AVIRON


                                    By  /s/ J. Leighton Read
                                       J. Leighton Read, M.D.
                                       Chairman and Chief Executive Officer


                                POWER OF ATTORNEY


        KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature
appears below constitutes and appoints J. Leighton Read, M.D. and Fred Kurland,
and each or any one of them, his true and lawful attorney-in-fact and agent,
with full power of substitution and resubstitution, for him and in his name,
place and stead, in any and all capacities, to sign any and all amendments
(including post-effective amendments) to this Registration Statement, and to
file the same, with all exhibits thereto, and other documents in connection
therewith, with the Securities and Exchange Commission, granting unto said
attorneys-in-fact and agents, and each of them, full power and authority to do
and perform each and every act and thing requisite and necessary to be done in
connection therewith, as fully to all intents and purposes as he might or could
do in person, hereby ratifying and confirming all that said attorneys-in-fact
and agents, or any of them, or their or his substitutes or substitute, may
lawfully do or cause to be done by virtue hereof.




                                       4
<PAGE>   5

        Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons in the
capacities and on the dates indicated.


<TABLE>
<CAPTION>
SIGNATURE                                   TITLE                               DATE
- ---------                                   -----                               ----
<S>                                         <C>                                 <C>
        /s/ J. Leighton Read                Chairman and Chief Executive        July 10, 1998
 ------------------------------------       Officer (Principal Executive
       J. Leighton Read, M.D.               Officer)
                                                                        



          /s/ Fred Kurland                  Senior Vice President and Chief     July 10, 1998
- ------------------------------------        Financial Officer (Principal
             Fred Kurland                   Financial and Accounting
                                            Officer)
                                            

        /s/ Reid W. Dennis                  Director                            July 10, 1998
- ------------------------------------
           Reid W. Dennis


      /s/ Paul H. Klingenstein              Director                            July 10, 1998
- ----------------------------------------
          Paul H. Klingenstein


         /s/ Bernard Roizman                Director                            July 10, 1998
- ------------------------------------
         Bernard Roizman, Sc.D.


           /s/ Jane E. Shaw                 Director                            July 10, 1998
- ------------------------------------
          Jane E. Shaw, Ph.D.
</TABLE>




                                       5
<PAGE>   6

                                  EXHIBIT INDEX


<TABLE>
<CAPTION>
EXHIBIT
NUMBER
- ------
<S>            <C>
3.1            Bylaws of the Company.(2)

3.2            Amended and Restated Certificate of Incorporation of the
               Company.(2)

4.1            Reference is made to Exhibits 3.1 and 3.2.

4.2            Specimen Stock Certificate.(1)

4.3            Warrant for Series A Preferred Stock, issued to The Mount Sinai
               School of Medicine of the City of New York.(1)

4.4            Warrant for Series A Preferred Stock, issued to The Mount Sinai
               School of Medicine of the City of New York.(1)

4.5            Warrant for Series A Preferred Stock, issued to The Mount Sinai
               School of Medicine of the City of New York.(1)

4.6            Warrant for Series A Preferred Stock, issued to The Mount Sinai
               School of Medicine of the City of New York.(1)

4.7            Investors Rights Agreement, dated July 18, 1995, among the
               Company and the investors named therein.(1)

4.8            Common Stock Purchase Agreement between the Company and Biotech
               Target, S.A., dated as of March 27, 1997.(3)

4.9            Rights Agreement between the Company and BankBoston, N.A., dates
               as of October 8, 1997.(4)

4.10           Registration Rights Agreement by and among Aviron, Morgan Stanley
               & Co., Bear Stearns & Co. Inc., Credit Suisse First Boston Corp.,
               and Hambrecht & Quist LLC, dated as of March 15, 1998.(5)

4.11           Indenture between Aviron and Marine Midland Bank, as Trustee
               dated as of March 15, 1998.(5)

4.12           Purchase Agreement by and among Aviron, Morgan Stanley & Co.,
               Bear, Stearns & Co. Inc., Credit Suisse First Boston Corp., and
               Hambrecht & Quist LLC, dated as of March 24, 1998.(5)

5.1            Opinion of Cooley Godward LLP.

10.9*          1996 Equity Incentive Plan.

10.11*         1996 Employee Stock Purchase Plan.

23.1           Consent of Ernst & Young LLP.

23.2           Consent of Cooley Godward LLP is contained in Exhibit 5.1 to this
               Registration Statement.

24.1           Power of Attorney is contained on the signature pages.
</TABLE>



                                       6
<PAGE>   7


*       Management Contract or Compensatory Plan or Agreement

(1)     Incorporated by reference to the correspondingly numbered exhibit to the
        Company's Registration Statement on Form S-1, File No. 333-05209, filed
        June 5, 1996, as amended.

(2)     Incorporated by reference to the correspondingly numbered exhibit to the
        Company's Quarterly Report on Form 10-Q, File No. 0-20815, for the
        quarter ended September 30, 1996, filed December 20, 1996.

(3)     Incorporated by reference to the correspondingly numbered exhibit to the
        Company's Quarterly Report on Form 10-Q, File No. 0-20815, for the
        quarter ended March 31, 1997, filed May 15, 1997.

(4)     Incorporated by reference to the correspondingly numbered exhibit to the
        Company's Quarterly Report on Form 8-K, File No. 0-20815, dated October
        8, 1997, and filed October 10, 1997.

(5)     Incorporated by reference to the correspondingly numbered exhibit to the
        Company's Registration Statement on Form S-3 (File No. 333-41649), filed
        December 7, 1997, as amended.




                                       7

<PAGE>   1
                                                                     EXHIBIT 5.1

                        [COOLEY GODWARD LLP LETTERHEAD]


July 9, 1998



Aviron
297 North Bernardo Avenue
Mountain View, CA  94043


Ladies and Gentlemen:

You have requested our opinion with respect to certain matters in connection
with the filing by Aviron (the "Company") of a Registration Statement on Form
S-8 (the "Registration Statement") with the Securities and Exchange Commission
covering the offering of up to 1,500,000 and 100,000 shares of the Company's
Common Stock, $.001 par value, (the "Shares") pursuant to its 1996 Equity
Incentive Plan (the "Incentive Plan") and its 1996 Employee Stock Purchase Plan
(the "Purchase Plan"), respectively.

In connection with this opinion, we have examined the Registration Statement and
related Prospectuses, your Certificate of Incorporation and By-laws, as amended,
and such other documents, records, certificates, memoranda and other instruments
as we deem necessary as a basis for this opinion. We have assumed the
genuineness and authenticity of all documents submitted to us as originals, the
conformity to originals of all documents submitted to us as copies thereof, and
the due execution and delivery of all documents where due execution and delivery
are a prerequisite to the effectiveness thereof.

On the basis of the foregoing, and in reliance thereon, we are of the opinion
that the Shares, when sold and issued in accordance with the Incentive Plan and
the Purchase Plan, the Registration Statement and related Prospectuses, will be
validly issued, fully paid, and nonassessable (except as to shares issued
pursuant to certain deferred payment arrangements, which will be fully paid and
nonassessable when such deferred payments are made in full).

We consent to the filing of this opinion as an exhibit to the Registration
Statement.

Very truly yours,

COOLEY GODWARD LLP



By:   /s/ Robert J. Brigham
      Robert J. Brigham


<PAGE>   1
                                                                    Exhibit 10.9

                                    AVIRON

                           1996 EQUITY INCENTIVE PLAN

                             ADOPTED MARCH 6, 1996

                     APPROVED BY STOCKHOLDERS JULY 22, 1996

                             AMENDED MARCH 12, 1998

                AMENDMENT APPROVED BY STOCKHOLDERS JUNE 4, 1998


1.       PURPOSES.

         (a)     The purpose of the Plan is to provide a means by which
selected Employees of and Consultants to the Company and its Affiliates may be
given an opportunity to benefit from increases in value of the stock of the
Company through the granting of (i) Incentive Stock Options, (ii) Nonstatutory
Stock Options, (iii) stock bonuses, (iv) rights to purchase restricted stock,
and (v) stock appreciation rights, all as defined below.  The Plan is successor
to, and restatement of, the Company's 1992 Stock Option Plan.

         (b)     The Company, by means of the Plan, seeks to retain the
services of persons who are now Employees of or Consultants, to secure and
retain the services of new Employees and Consultants, and to provide incentives
for such persons to exert maximum efforts for the success of the Company and
its Affiliates.

         (c)     The Company intends that the Stock Awards issued under the
Plan shall, in the discretion of the Board or any Committee to which
responsibility for administration of the Plan has been delegated pursuant to
subsection 3(c), be either (i) Options granted pursuant to Section 6 hereof,
including Incentive Stock Options and Nonstatutory Stock Options, (ii) stock
bonuses or rights to purchase restricted stock granted pursuant to Section 7
hereof, or (iii) stock appreciation rights granted pursuant to Section 8
hereof.  All Options shall be separately designated Incentive Stock Options or
Nonstatutory Stock Options at the time of grant, and in such form as issued
pursuant to Section 6, and a separate certificate or certificates will be
issued for shares purchased on exercise of each type of Option.

2.       DEFINITIONS.

         (a)     "AFFILIATE" means any parent corporation or subsidiary
corporation, whether now or hereafter existing, as those terms are defined in
Sections 424(e) and (f) respectively, of the Code.

         (b)     "BOARD" means the Board of Directors of the Company.

         (c)     "CODE" means the Internal Revenue Code of 1986, as amended.
<PAGE>   2
         (d)     "COMMITTEE" means a Committee appointed by the Board in
accordance with subsection 3(c) of the Plan.

         (e)     "COMPANY" means Aviron, a Delaware corporation.

         (f)     "CONCURRENT STOCK APPRECIATION RIGHT" or "CONCURRENT RIGHT"
means a right granted pursuant to subsection 8(b)(2) of the Plan.

         (g)     "CONSULTANT" means any person, including an advisor, engaged
by the Company or an Affiliate to render consulting services and who is
compensated for such services, provided that the term "Consultant" shall not
include Directors who are paid only a director's fee by the Company or who are
not compensated by the Company for their services as Directors.

         (h)     "CONTINUOUS STATUS AS AN EMPLOYEE, DIRECTOR OR CONSULTANT"
means the employment or relationship as a Director or Consultant is not
interrupted or terminated.  The Board, in its sole discretion, may determine
whether Continuous Status as an Employee, Director or Consultant shall be
considered interrupted in the case of:  (i) any leave of absence approved by
the Board, including sick leave, military leave, or any other personal leave;
or (ii) transfers between locations of the Company or between the Company,
Affiliates or their successors.

         (i)     "COVERED EMPLOYEE" means the chief executive officer and the
four (4) other highest compensated officers of the Company for whom total
compensation is required to be reported to shareholders under the Exchange Act,
as determined for purposes of Section 162(m) of the Code.

         (j)     "DIRECTOR" means a member of the Board.

         (k)     "EMPLOYEE" means any person, including Officers and Directors,
employed by the Company or any Affiliate of the Company.  Neither service as a
Director nor payment of a director's fee by the Company shall be sufficient to
constitute "employment" by the Company.

         (l)     "EXCHANGE ACT" means the Securities Exchange Act of 1934, as
amended.

         (m)     "FAIR MARKET VALUE" means, as of any date, the value of the
common stock of the Company determined as follows:

                 (1)      If the common stock is listed on any established
stock exchange or a national market system, including without limitation the
National Market of The Nasdaq Stock Market, the Fair Market Value of a share of
common stock shall be the closing sales price for such stock (or the closing
bid, if no sales were reported) as quoted on such system or exchange (or the
exchange with the greatest volume of trading in common stock) on the last
market trading day prior to the day of determination, as reported in the Wall
Street Journal or such other source as the Board deems reliable;


                                       2.
<PAGE>   3
                 (2)      If the common stock is quoted on The Nasdaq Stock
Market (but not on the National Market thereof) or is regularly quoted by a
recognized securities dealer but selling prices are not reported, the Fair
Market Value of a share of common stock shall be the mean between the bid and
asked prices for the common stock on the last market trading day prior to the
day of determination, as reported in the Wall Street Journal or such other
source as the Board deems reliable;

                 (3)      In the absence of an established market for the
common stock, the Fair Market Value shall be determined in good faith by the
Board.

         (n)     "INCENTIVE STOCK OPTION" means an Option intended to qualify
as an incentive stock option within the meaning of Section 422 of the Code and
the regulations promulgated thereunder.

         (o)     "INDEPENDENT STOCK APPRECIATION RIGHT" or "INDEPENDENT RIGHT"
means a right granted pursuant to subsection 8(b)(3) of the Plan.

         (p)     "NON-EMPLOYEE DIRECTOR" means a Director of the Company who
either (i) is not a current Employee or Officer of the Company or its parent or
subsidiary, does not receive compensation (directly or indirectly) from the
Company or its parent or subsidiary for services rendered as a consultant or in
any capacity other than as a Director (except for an amount as to which
disclosure would not be required under Item 404(a) of Regulation S-K
promulgated pursuant to the Securities Act ("Regulation S-K")), does not
possess an interest in any transaction as to which disclosure would be required
under Item 404(a) of Regulation S-K and is not engaged in a business
relationship as to which disclosure would be required under Item 404(b) of
Regulation S-K; or (ii) is otherwise considered a "non-employee director" for
purposes of Rule 16b-3.

         (q)     "NONSTATUTORY STOCK OPTION" means an Option not intended to
qualify as an Incentive Stock Option.

         (r)     "OFFICER" means a person who is an officer of the Company
within the meaning of Section 16 of the Exchange Act and the rules and
regulations promulgated thereunder.

         (s)     "OPTION" means a stock option granted pursuant to the Plan.

         (t)     "OPTION AGREEMENT" means a written agreement between the
Company and an Optionee evidencing the terms and conditions of an individual
Option grant.  Each Option Agreement shall be subject to the terms and
conditions of the Plan.

         (u)     "OPTIONEE" means an Employee or Consultant who holds an
outstanding Option.

         (v)     "OUTSIDE DIRECTOR" means a Director who either (i) is not a
current employee of the Company or an "affiliated corporation" (within the
meaning of Treasury regulations promulgated under Section 162(m) of the Code),
is not a former employee of the Company or


                                       3.
<PAGE>   4
an "affiliated corporation" receiving compensation for prior services (other
than benefits under a tax qualified pension plan), was not an officer of the
Company or an "affiliated corporation" at any time, and is not currently
receiving direct or indirect remuneration from the Company or an "affiliated
corporation" for services in any capacity other than as a Director, or (ii) is
otherwise considered an "outside director" for purposes of Section 162(m) of
the Code.

         (w)     "PLAN" means this Aviron 1996 Equity Incentive Plan.

         (x)     "RULE 16B-3" means Rule 16b-3 of the Exchange Act or any
successor to Rule 16b-3, as in effect when discretion is being exercised with
respect to the Plan.

         (y)     "STOCK APPRECIATION RIGHT" means any of the various types of
rights which may be granted under Section 8 of the Plan.

         (z)     "STOCK AWARD" means any right granted under the Plan,
including any Option, any stock bonus, any right to purchase restricted stock,
and any Stock Appreciation Right.

         (aa)    "STOCK AWARD AGREEMENT" means a written agreement between the
Company and a holder of a Stock Award evidencing the terms and conditions of an
individual Stock Award grant.  Each Stock Award Agreement shall be subject to
the terms and conditions of the Plan.

         (bb)    "TANDEM STOCK APPRECIATION RIGHT" or "TANDEM RIGHT" means a
right granted pursuant to subsection 8(b)(1) of the Plan.

3.       ADMINISTRATION.

         (a)     The Plan shall be administered by the Board unless and until
the Board delegates administration to a Committee, as provided in subsection
3(c).

         (b)     The Board shall have the power, subject to, and within the
limitations of, the express provisions of the Plan:

                 (1)      To determine from time to time which of the persons
eligible under the Plan shall be granted Stock Awards; when and how each Stock
Award shall be granted; whether a Stock Award will be an Incentive Stock
Option, a Nonstatutory Stock Option, a stock bonus, a right to purchase
restricted stock, a Stock Appreciation Right, or a combination of the
foregoing; the provisions of each Stock Award granted (which need not be
identical), including the time or times when a person shall be permitted to
receive stock pursuant to a Stock Award; whether a person shall be permitted to
receive stock upon exercise of an Independent Stock Appreciation Right; and the
number of shares with respect to which a Stock Award shall be granted to each
such person.

                 (2)      To construe and interpret the Plan and Stock Awards
granted under it, and to establish, amend and revoke rules and regulations for
its administration.  The Board, in the exercise of this power, may correct any
defect, omission or inconsistency in the Plan or in any


                                       4.
<PAGE>   5
Stock Award Agreement, in a manner and to the extent it shall deem necessary or
expedient to make the Plan fully effective.

                 (3)      To amend the Plan or a Stock Award as provided in
Section 14.

                 (4)      Generally, to exercise such powers and to perform
such acts as the Board deems necessary or expedient to promote the best
interests of the Company which are not in conflict with the provisions of the
Plan.

         (c)     The Board may delegate administration of the Plan to a
committee composed of not fewer than two (2) members (the "Committee"), all of
the members of which Committee may be, in the discretion of the Board,
Non-Employee Directors and may also be, in the discretion of the Board, Outside
Directors.  If administration is delegated to a Committee, the Committee shall
have, in connection with the administration of the Plan, the powers theretofore
possessed by the Board (and references in this Plan to the Board shall
thereafter be to the Committee), subject, however, to such resolutions, not
inconsistent with the provisions of the Plan, as may be adopted from time to
time by the Board.  The Board may abolish the Committee at any time and revest
in the Board the administration of the Plan.  Notwithstanding anything in this
Section 3 to the contrary, at any time the Board or the Committee may delegate
to a committee of one or more members of the Board the authority to grant Stock
Awards to eligible persons who (1) are not then subject to Section 16 of the
Exchange Act and/or (2) are either (i) not then Covered Employees and are not
expected to be Covered Employees at the time of recognition of income resulting
from such Stock Award, or (ii) not persons with respect to whom the Company
wishes to avoid the application of Section 162(m) of the Code.

4.       SHARES SUBJECT TO THE PLAN.

         (a)     Subject to the provisions of Section 13 relating to
adjustments upon changes in stock, the stock that may be issued pursuant to
Stock Awards shall not exceed in the aggregate three million two hundred fifty
thousand (3,250,000) shares of the Company's common stock. If any Stock Award
shall for any reason expire or otherwise terminate, in whole or in part,
without having been exercised in full, the stock not acquired under such Stock
Award shall revert to and again become available for issuance under the Plan.
Shares subject to Stock Appreciation Rights exercised in accordance with
Section 8 of the Plan shall not be available for subsequent issuance under the
Plan.

         (b)     The stock subject to the Plan may be unissued shares or
reacquired shares, bought on the market or otherwise.


                                       5.
<PAGE>   6
5.       ELIGIBILITY.

         (a)     Incentive Stock Options and Stock Appreciation Rights
appurtenant thereto may be granted only to Employees.  Stock Awards other than
Incentive Stock Options and Stock Appreciation Rights appurtenant thereto may
be granted only to Employees or Consultants.

         (b)     A Director shall be eligible for the benefits of the Plan
unless at the time of grant the Director is also an Employee or Consultant. A
Non-Employee Director shall be eligible for the benefits of the Plan, provided,
however, that any grant to a Non-Employee Director shall not exceed the lesser
of (1) 1% of the shares of Common Stock outstanding on the date of grant or (2)
25,000 shares.

         (c)     No person shall be eligible for the grant of an Incentive
Stock Option if, at the time of grant, such person owns (or is deemed to own
pursuant to Section 424(d) of the Code) stock possessing more than ten percent
(10%) of the total combined voting power of all classes of stock of the Company
or of any of its Affiliates unless the exercise price of such Option is at
least one hundred ten percent (110%) of the Fair Market Value of such stock at
the date of grant and the Option is not exercisable after the expiration of
five (5) years from the date of grant, or in the case of a restricted stock
purchase award, the purchase price is at least one hundred percent (100%) of
the Fair Market Value of such stock at the date of grant.

         (d)     Subject to the provisions of Section 13 relating to
adjustments upon changes in stock, no person shall be eligible to be granted
Options and Stock Appreciation Rights covering more than one hundred fifty
thousand (150,000) (after giving effect to the one-for-five reverse split of
the Company's Common Stock approved in March, 1996) shares of the Company's
common stock in any calendar year.

6.       OPTION PROVISIONS.

         Each Option shall be in such form and shall contain such terms and
conditions as the Board shall deem appropriate.  The provisions of separate
Options need not be identical, but each Option shall include (through
incorporation of provisions hereof by reference in the Option or otherwise) the
substance of each of the following provisions:

         (a)     TERM.  No Option shall be exercisable after the expiration of
ten (10) years from the date it was granted.

         (b)     PRICE.  The exercise price of each Incentive Stock Option
shall be not less than one hundred percent (100%) of the Fair Market Value of
the stock subject to the Option on the date the Option is granted; the exercise
price of a Nonstatutory Stock Option shall be not less than eighty-five percent
(85%) of the Fair Market Value of the stock subject to the Option on the date
the Option is granted.  Notwithstanding the foregoing, an Incentive Stock
Option may be granted with an exercise price lower than that set forth in the
preceding sentence if such Option is granted pursuant to an assumption or
substitution for another option in a manner satisfying the provisions of
Section 424(a) of the Code.

         (c)     CONSIDERATION.  The purchase price of stock acquired pursuant
to an Option shall be paid, to the extent permitted by applicable statutes and
regulations, either (i) in cash at the time the Option is exercised, or (ii) at
the discretion of the Board or the Committee, at the time


                                       6.
<PAGE>   7
of the grant of the Option, (A) by delivery to the Company of other common
stock of the Company, (B) according to a deferred payment or other arrangement
(which may include, without limiting the generality of the foregoing, the use
of other common stock of the Company) with the person to whom the Option is
granted or to whom the Option is transferred pursuant to subsection 6(d), or
(C) in any other form of legal consideration that may be acceptable to the
Board.

         In the case of any deferred payment arrangement, interest shall be
payable at least annually and shall be charged at the minimum rate of interest
necessary to avoid the treatment as interest, under any applicable provisions
of the Code, of any amounts other than amounts stated to be interest under the
deferred payment arrangement. Further, the "par value" of any stock subject to
an Option shall not be payable pursuant to a deferred payment arrangement.

         (d)     TRANSFERABILITY.  An Incentive Stock Option shall not be
transferable except by will or by the laws of descent and distribution, and
shall be exercisable during the lifetime of the person to whom the Incentive
Stock Option is granted only by such person.  A Nonstatutory Stock Option shall
not be transferable except by will, by the laws of descent and distribution or
pursuant to a domestic relations order satisfying the requirements of Rule 16b-3
and any administrative interpretations or pronouncements thereunder (a "DRO"),
and shall be exercisable during the lifetime of the person to whom the Option is
granted only by such person or any transferee pursuant to a DRO. Notwithstanding
the foregoing, the person to whom the Option is granted may, by delivering
written notice to the Company, in a form satisfactory to the Company, designate
a third party who, in the event of the death of the Optionee, shall thereafter
be entitled to exercise the Option.

         (e)     VESTING.  The total number of shares of stock subject to an
Option may, but need not, be allotted in periodic installments (which may, but
need not, be equal).  The Option Agreement may provide that from time to time
during each of such installment periods, the Option may become exercisable
("vest") with respect to some or all of the shares allotted to that period, and
may be exercised with respect to some or all of the shares allotted to such
period and/or any prior period as to which the Option became vested but was not
fully exercised.  The Option may be subject to such other terms and conditions
on the time or times when it may be exercised (which may be based on
performance or other criteria) as the Board may deem appropriate.  The
provisions of this subsection 6(e) are subject to any Option provisions
governing the minimum number of shares as to which an Option may be exercised.

         (f)     TERMINATION OF EMPLOYMENT OR RELATIONSHIP AS A DIRECTOR OR
CONSULTANT.  In the event an Optionee's Continuous Status as an Employee,
Director or Consultant terminates (other than upon the Optionee's death or
disability), the Optionee may exercise his or her Option (to the extent that
the Optionee was entitled to exercise it at the date of termination) but only
within such period of time ending on the earlier of (i) the date three (3)
months after the termination of the Optionee's Continuous Status as an
Employee, Director or Consultant (or such longer or shorter period specified in
the Option Agreement), or (ii) the expiration of the term of the Option as set
forth in the Option Agreement.  If, after termination, the Optionee does not
exercise his or her Option within the time specified in the Option Agreement,
the Option shall


                                       7.
<PAGE>   8
terminate, and the shares covered by such Option shall revert to and again
become available for issuance under the Plan.

         An Optionee's Option Agreement may also provide that if the exercise
of the Option following the termination of the Optionee's Continuous Status as
an Employee, Director, or Consultant (other than upon the Optionee's death or
disability) would result in liability under Section 16(b) of the Exchange Act,
then the Option shall terminate on the earlier of (i) the expiration of the
term of the Option set forth in the Option Agreement, or (ii) the tenth (10th)
day after the last date on which such exercise would result in such liability
under Section 16(b) of the Exchange Act.  Finally, an Optionee's Option
Agreement may also provide that if the exercise of the Option following the
termination of the Optionee's Continuous Status as an Employee, Director or
Consultant (other than upon the Optionee's death or disability) would be
prohibited at any time solely because the issuance of shares would violate the
registration requirements under the Act, then the Option shall terminate on the
earlier of (i) the expiration of the term of the Option set forth in the first
paragraph of this subsection 6(f), or (ii) the expiration of a period of three
(3) months after the termination of the Optionee's Continuous Status as an
Employee, Director or Consultant during which the exercise of the Option would
not be in violation of such registration requirements.

         (g)     DISABILITY OF OPTIONEE.  In the event an Optionee's Continuous
Status as an Employee, Director or Consultant terminates as a result of the
Optionee's disability, the Optionee may exercise his or her Option (to the
extent that the Optionee was entitled to exercise it at the date of
termination), but only within such period of time ending on the earlier of (i)
the date twelve (12) months following such termination (or such longer or
shorter period specified in the Option Agreement), or (ii) the expiration of
the term of the Option as set forth in the Option Agreement.  If, at the date
of termination, the Optionee is not entitled to exercise his or her entire
Option, the shares covered by the unexercisable portion of the Option shall
revert to and again become available for issuance under the Plan.  If, after
termination, the Optionee does not exercise his or her Option within the time
specified herein, the Option shall terminate, and the shares covered by such
Option shall revert to and again become available for issuance under the Plan.

         (h)  DEATH OF OPTIONEE.  In the event of the death of an Optionee
during, or within a period specified in the Option after the termination of,
the Optionee's Continuous Status as an Employee, Director or Consultant, the
Option may be exercised (to the extent the Optionee was entitled to exercise
the Option at the date of death) by the Optionee's estate, by a person who
acquired the right to exercise the Option by bequest or inheritance or by a
person designated to exercise the option upon the Optionee's death pursuant to
subsection 6(d), but only within the period ending on the earlier of (i) the
date twelve (12) months following the date of death (or such longer or shorter
period specified in the Option Agreement), or (ii) the expiration of the term
of such Option as set forth in the Option Agreement.  If, at the time of death,
the Optionee was not entitled to exercise his or her entire Option, the shares
covered by the unexercisable portion of the Option shall revert to and again
become available for issuance under the Plan.  If, after death, the Option is
not exercised within the time specified herein, the Option shall


                                       8.
<PAGE>   9
terminate, and the shares covered by such Option shall revert to and again
become available for issuance under the Plan.

         (i)     EARLY EXERCISE.  The Option may, but need not, include a
provision whereby the Optionee may elect at any time while an Employee,
Director or Consultant to exercise the Option as to any part or all of the
shares subject to the Option prior to the full vesting of the Option.  Any
unvested shares so purchased may be subject to a repurchase right in favor of
the Company or to any other restriction the Board determines to be appropriate.

         (j)     RE-LOAD OPTIONS.  Without in any way limiting the authority of
the Board or Committee to make or not to make grants of Options hereunder, the
Board or Committee shall have the authority (but not an obligation) to include
as part of any Option Agreement a provision entitling the Optionee to a further
Option (a "Re-Load Option") in the event the Optionee exercises the Option
evidenced by the Option agreement, in whole or in part, by surrendering other
shares of Common Stock in accordance with this Plan and the terms and
conditions of the Option Agreement.  Any such Re-Load Option (i) shall be for a
number of shares equal to the number of shares surrendered as part or all of
the exercise price of such Option; (ii) shall have an expiration date which is
the same as the expiration date of the Option the exercise of which gave rise
to such Re-Load Option; and (iii) shall have an exercise price which is equal
to one hundred percent (100%) of the Fair Market Value of the Common Stock
subject to the Re-Load Option on the date of exercise of the original Option.
Notwithstanding the foregoing, a Re-Load Option which is an Incentive Stock
Option and which is granted to a 10% stockholder (as described in subsection
5(c)), shall have an exercise price which is equal to one hundred ten percent
(110%) of the Fair Market Value of the stock subject to the Re-Load Option on
the date of exercise of the original Option and shall have a term which is no
longer than five (5) years.

         Any such Re-Load Option may be an Incentive Stock Option or a
Nonstatutory Stock Option, as the Board or Committee may designate at the time
of the grant of the original Option; provided, however, that the designation of
any Re-Load Option as an Incentive Stock Option shall be subject to the one
hundred thousand dollar ($100,000) annual limitation on exercisability of
Incentive Stock Options described in subsection 12(d) of the Plan and in
Section 422(d) of the Code.  There shall be no Re-Load Options on a Re-Load
Option.  Any such Re-Load Option shall be subject to the availability of
sufficient shares under subsection 4(a) and shall be subject to such other
terms and conditions as the Board or Committee may determine which are not
inconsistent with the express provisions of the Plan regarding the terms of
Options.

7.       TERMS OF STOCK BONUSES AND PURCHASES OF RESTRICTED STOCK.

         Each stock bonus or restricted stock purchase agreement shall be in
such form and shall contain such terms and conditions as the Board or the
Committee shall deem appropriate.  The terms and conditions of stock bonus or
restricted stock purchase agreements may change from time to time, and the
terms and conditions of separate agreements need not be identical, but each
stock bonus or restricted stock purchase agreement shall include (through
incorporation of provisions hereof by reference in the agreement or otherwise)
the substance of each of the following provisions as appropriate:


                                       9.
<PAGE>   10
         (a)     PURCHASE PRICE.  The purchase price under each restricted
stock purchase agreement shall be such amount as the Board or Committee shall
determine and designate in such agreement but in no event shall the purchase
price be less than eighty-five percent (85%) of the stock's Fair Market Value
on the date such award is made.  Notwithstanding the foregoing, the Board or
the Committee may determine that eligible participants in the Plan may be
awarded stock pursuant to a stock bonus agreement in consideration for past
services actually rendered to the Company for its benefit.

         (b)     TRANSFERABILITY.  No rights under a stock bonus or restricted
stock purchase agreement shall be transferable except by will or the laws of
descent and distribution or pursuant to a qualified domestic relations order
satisfying the requirements of Rule 16b-3 and any administrative
interpretations or pronouncements thereunder, so long as stock awarded under
such agreement remains subject to the terms of the agreement.

         (c)     CONSIDERATION.  The purchase price of stock acquired pursuant
to a stock purchase agreement shall be paid either:  (i) in cash at the time of
purchase; (ii) at the discretion of the Board or the Committee, according to a
deferred payment or other arrangement with the person to whom the stock is
sold; or (iii) in any other form of legal consideration that may be acceptable
to the Board or the Committee in its discretion.  Notwithstanding the
foregoing, the Board or the Committee to which administration of the Plan has
been delegated may award stock pursuant to a stock bonus agreement in
consideration for past services actually rendered to the Company or for its
benefit.

         (d)     VESTING.  Shares of stock sold or awarded under the Plan may,
but need not, be subject to a repurchase option in favor of the Company in
accordance with a vesting schedule to be determined by the Board or the
Committee.

         (e)     TERMINATION OF EMPLOYMENT OR RELATIONSHIP AS A DIRECTOR OR
CONSULTANT.  In the event a Participant's Continuous Status as an Employee,
Director or Consultant terminates, the Company may repurchase or otherwise
reacquire any or all of the shares of stock held by that person which have not
vested as of the date of termination under the terms of the stock bonus or
restricted stock purchase agreement between the Company and such person.

8.       STOCK APPRECIATION RIGHTS.

         (a)     The Board or Committee shall have full power and authority,
exercisable in its sole discretion, to grant Stock Appreciation Rights under
the Plan to Employees and Consultants.  To exercise any outstanding Stock
Appreciation Right, the holder must provide written notice of exercise to the
Company in compliance with the provisions of the Stock Award Agreement
evidencing such right.  If a Stock Appreciation Right is granted to an
individual who is at the time subject to Section 16(b) of the Exchange Act (a
"Section 16(b) Insider"), the Stock Award Agreement of grant shall incorporate
all the terms and conditions at the time necessary to assure that the
subsequent exercise of such right shall qualify for the safe-harbor exemption
from short-swing profit liability provided by Rule 16b-3 promulgated under the
Exchange Act (or any successor rule or regulation).  Except as provided in
subsection 5(d), no limitation shall exist


                                      10.
<PAGE>   11
on the aggregate amount of cash payments the Company may make under the Plan in
connection with the exercise of a Stock Appreciation Rights.

         (b)     Three types of Stock Appreciation Rights shall be authorized
for issuance under the Plan:

                 (1)      TANDEM STOCK APPRECIATION RIGHTS.  Tandem Stock
Appreciation Rights will be granted appurtenant to an Option, and shall, except
as specifically set forth in this Section 8, be subject to the same terms and
conditions applicable to the particular Option grant to which it pertains.
Tandem Stock Appreciation Rights will require the holder to elect between the
exercise of the underlying Option for shares of stock and the surrender, in
whole or in part, of such Option for an appreciation distribution.  The
appreciation distribution payable on the exercised Tandem Right shall be in
cash (or, if so provided, in an equivalent number of shares of stock based on
Fair Market Value on the date of the Option surrender) in an amount up to the
excess of (A) the Fair Market Value (on the date of the Option surrender) of
the number of shares of stock covered by that portion of the surrendered Option
in which the Optionee is vested over (B) the aggregate exercise price payable
for such vested shares.

                 (2)      CONCURRENT STOCK APPRECIATION RIGHTS.  Concurrent
Rights will be granted appurtenant to an Option and may apply to all or any
portion of the shares of stock subject to the underlying Option and shall,
except as specifically set forth in this Section 8, be subject to the same
terms and conditions applicable to the particular Option grant to which it
pertains.  A Concurrent Right shall be exercised automatically at the same time
the underlying Option is exercised with respect to the particular shares of
stock to which the Concurrent Right pertains.  The appreciation distribution
payable on an exercised Concurrent Right shall be in cash (or, if so provided,
in an equivalent number of shares of stock based on Fair Market Value on the
date of the exercise of the Concurrent Right) in an amount equal to such
portion as shall be determined by the Board or the Committee at the time of the
grant of the excess of (A) the aggregate Fair Market Value (on the date of the
exercise of the Concurrent Right) of the vested shares of stock purchased under
the underlying Option which have Concurrent Rights appurtenant to them over (B)
the aggregate exercise price paid for such shares.

                 (3)      INDEPENDENT STOCK APPRECIATION RIGHTS.  Independent
Rights will be granted independently of any Option and shall, except as
specifically set forth in this Section 8, be subject to the same terms and
conditions applicable to Nonstatutory Stock Options as set forth in Section 6.
They shall be denominated in share equivalents.  The appreciation distribution
payable on the exercised Independent Right shall be not greater than an amount
equal to the excess of (A) the aggregate Fair Market Value (on the date of the
exercise of the Independent Right) of a number of shares of Company stock equal
to the number of share equivalents in which the holder is vested under such
Independent Right, and with respect to which the holder is exercising the
Independent Right on such date, over (B) the aggregate Fair Market Value (on
the date of the grant of the Independent Right) of such number of shares of
Company stock.  The appreciation distribution payable on the exercised
Independent Right shall be in cash or, if so provided, in an equivalent number
of shares of stock based on Fair Market Value on the date of the exercise of
the Independent Right.


                                      11.
<PAGE>   12
9.       CANCELLATION AND RE-GRANT OF OPTIONS.

         (a)     The Board or the Committee shall have the authority to effect,
at any time and from time to time,  (i) the repricing of any outstanding
Options and/or any Stock Appreciation Rights under the Plan and/or (ii) with
the consent of any adversely affected holders of Options and/or Stock
Appreciation Rights, the cancellation of any outstanding Options and/or any
Stock Appreciation Rights under the Plan and the grant in substitution therefor
of new Options and/or Stock Appreciation Rights under the Plan covering the
same or different numbers of shares of stock, but having an exercise price per
share not less than:  eighty-five percent (85%) of the Fair Market Value for a
Nonstatutory Stock Option, one hundred percent (100%) of the Fair Market Value
in the case of an Incentive Stock Option or, in the case of an Incentive Stock
Option held by a 10% stockholder (as described in subsection 5(c)), not less
than one hundred ten percent (110%) of the Fair Market Value per share of stock
on the new grant date.  Notwithstanding the foregoing, the Board or the
Committee may grant an Option and/or Stock Appreciation Right with an exercise
price lower than that set forth above if such Option and/or Stock Appreciation
Right is granted as part of a transaction to which section 424(a) of the Code
applies.

         (b)     Shares subject to an Option or Stock Appreciation Right
canceled under this Section 9 shall continue to be counted against the maximum
award of Options and Stock Appreciation Rights permitted to be granted pursuant
to subsection 5(d) of the Plan.  The repricing of an Option and/or Stock
Appreciation Right under this Section 9, resulting in a reduction of the
exercise price, shall be deemed to be a cancellation of the original Option
and/or Stock Appreciation Right and the grant of a substitute Option and/or
Stock Appreciation Right; in the event of such repricing, both the original and
the substituted Options and Stock Appreciation Rights shall be counted against
the maximum awards of Options and Stock Appreciation Rights permitted to be
granted pursuant to subsection 5(d) of the Plan.  The provisions of this
subsection 9(b) shall be applicable only to the extent required by Section
162(m) of the Code.

10.      COVENANTS OF THE COMPANY.

         (a)     During the terms of the Stock Awards, the Company shall keep
available at all times the number of shares of stock required to satisfy such
Stock Awards.

         (b)     The Company shall seek to obtain from each regulatory
commission or agency having jurisdiction over the Plan such authority as may be
required to issue and sell shares of stock upon exercise of the Stock Award;
provided, however, that this undertaking shall not require the Company to
register under the Securities Act of 1933, as amended (the "Securities Act")
either the Plan, any Stock Award or any stock issued or issuable pursuant to
any such Stock Award.  If, after reasonable efforts, the Company is unable to
obtain from any such regulatory commission or agency the authority which
counsel for the Company deems necessary for the lawful issuance and sale of
stock under the Plan, the Company shall be relieved from any


                                      12.
<PAGE>   13
liability for failure to issue and sell stock upon exercise of such Stock
Awards unless and until such authority is obtained.

11.      USE OF PROCEEDS FROM STOCK.

         Proceeds from the sale of stock pursuant to Stock Awards shall
constitute general funds of the Company.

12.      MISCELLANEOUS.

         (a)     The Board shall have the power to accelerate the time at which
a Stock Award may first be exercised or the time during which a Stock Award or
any part thereof will vest pursuant to subsection 6(e), 7(d) or 8(b),
notwithstanding the provisions in the Stock Award stating the time at which it
may first be exercised or the time during which it will vest.

         (b)     Neither an Employee, a Consultant nor any person to whom a
Stock Award is transferred in accordance with the Plan shall be deemed to be
the holder of, or to have any of the rights of a holder with respect to, any
shares subject to such Stock Award unless and until such person has satisfied
all requirements for exercise of the Stock Award pursuant to its terms.

         (c)     Nothing in the Plan or any instrument executed or Stock Award
granted pursuant thereto shall confer upon any Employee, Consultant or other
holder of Stock Awards any right to continue in the employ of the Company or
any Affiliate or to continue acting as a Consultant or shall affect the right
of the Company or any Affiliate to terminate the employment of any Employee
with or without notice and with or without cause, or the right to terminate the
relationship of any Consultant pursuant to the terms of such Consultant's
agreement with the Company or Affiliate.

         (d)     To the extent that the aggregate Fair Market Value (determined
at the time of grant) of stock with respect to which Incentive Stock Options
are exercisable for the first time by any Optionee during any calendar year
under all plans of the Company and its Affiliates exceeds one hundred thousand
dollars ($100,000), the Options or portions thereof which exceed such limit
(according to the order in which they were granted) shall be treated as
Nonstatutory Stock Options.

         (e)     The Company may require any person to whom a Stock Award is
granted, or any person to whom a Stock Award is transferred in accordance with
the Plan, as a condition of exercising or acquiring stock under any Stock
Award, (1) to give written assurances satisfactory to the Company as to such
person's knowledge and experience in financial and business matters and/or to
employ a purchaser representative reasonably satisfactory to the Company who is
knowledgeable and experienced in financial and business matters, and that he or
she is capable of evaluating, alone or together with the purchaser
representative, the merits and risks of exercising the Stock Award; and (2) to
give written assurances satisfactory to the Company stating that such person is
acquiring the stock subject to the Stock Award for such person's own account
and not with any present intention of selling or otherwise distributing the
stock.  The


                                      13.
<PAGE>   14
foregoing requirements, and any assurances given pursuant to such requirements,
shall be inoperative if (i) the issuance of the shares upon the exercise or
acquisition of stock under the Stock Award has been registered under a then
currently effective registration statement under the Securities Act, or (ii) as
to any particular requirement, a determination is made by counsel for the
Company that such requirement need not be met in the circumstances under the
then applicable securities laws.  The Company may, upon advice of counsel to
the Company, place legends on stock certificates issued under the Plan as such
counsel deems necessary or appropriate in order to comply with applicable
securities laws, including, but not limited to, legends restricting the
transfer of the stock.

         (f)     To the extent provided by the terms of a Stock Award
Agreement, the person to whom a Stock Award is granted may satisfy any federal,
state or local tax withholding obligation relating to the exercise or
acquisition of stock under a Stock Award by any of the following means or by a
combination of such means:  (1) tendering a cash payment; (2) authorizing the
Company to withhold shares from the shares of the common stock otherwise
issuable to the participant as a result of the exercise or acquisition of stock
under the Stock Award; or (3) delivering to the Company owned and unencumbered
shares of the common stock of the Company.

13.      ADJUSTMENTS UPON CHANGES IN STOCK.

         (a)     If any change is made in the stock subject to the Plan, or
subject to any Stock Award, without the receipt of consideration by the Company
(through merger, consolidation, reorganization, recapitalization,
reincorporation, stock dividend, dividend in property other than cash, stock
split, liquidating dividend, combination of shares, exchange of shares, change
in corporate structure or other transaction not involving the receipt of
consideration by the Company), the Plan will be appropriately adjusted in the
class(es) and maximum number of shares subject to the Plan pursuant to
subsection 4(a) and the maximum number of shares subject to award to any person
during any calendar year pursuant to subsection 5(d), and the outstanding Stock
Awards will be appropriately adjusted in the class(es) and number of shares and
price per share of stock subject to such outstanding Stock Awards.  Such
adjustments shall be made by the Board or the Committee, the determination of
which shall be final, binding and conclusive.  (The conversion of any
convertible securities of the Company shall not be treated as a "transaction
not involving the receipt of consideration by the Company".)

         (b)     In the event of:  (1) a dissolution, liquidation or sale of
substantially all of the assets of the Company; (2) a merger or consolidation
in which the Company is not the surviving corporation; or (3) a reverse merger
in which the Company is the surviving corporation but the shares of the
Company's common stock outstanding immediately preceding the merger are
converted by virtue of the merger into other property, whether in the form of
securities, cash or otherwise, then to the extent permitted by applicable law:
(i) any surviving corporation or an Affiliate of such surviving corporation
shall assume any Stock Awards outstanding under the Plan or shall substitute
similar Stock Awards for those outstanding under the Plan, or (ii) such Stock
Awards shall continue in full force and effect.  In the event any surviving
corporation and its Affiliates refuse to assume or continue such Stock Awards,
or to substitute similar options


                                      14.
<PAGE>   15
for those outstanding under the Plan, then, with respect to Stock Awards held
by persons then performing services as Employees, Directors or Consultants, the
time during which such Stock Awards may be exercised shall be accelerated and
the Stock Awards terminated if not exercised prior to such event.

14.      AMENDMENT OF THE PLAN AND STOCK AWARDS.

         (a)     The Board at any time, and from time to time, may amend the
Plan.  However, except as provided in Section 13 relating to adjustments upon
changes in stock, no amendment shall be effective unless approved by the
stockholders of the Company within twelve (12) months before or after the
adoption of the amendment, where the amendment will modify the Plan in any way
that would require stockholder approval in order for the Plan to satisfy the
requirements of Section 422 of the Code or to comply with the requirements of
Rule 16b-3 or any Nasdaq or securities exchange listing requirements (e.g., an
increase in the number of shares available for awards or a change to eligibility
for Awards).

         (b)     The Board may in its sole discretion submit any other
amendment to the Plan for stockholder approval, including, but not limited to,
amendments to the Plan intended to satisfy the requirements of Section 162(m)
of the Code and the regulations promulgated thereunder regarding the exclusion
of performance-based compensation from the limit on corporate deductibility of
compensation paid to certain executive officers.

         (c)     It is expressly contemplated that the Board may amend the Plan
in any respect the Board deems necessary or advisable to provide eligible
Employees or Consultants with the maximum benefits provided or to be provided
under the provisions of the Code and the regulations promulgated thereunder
relating to Incentive Stock Options and/or to bring the Plan and/or Incentive
Stock Options granted under it into compliance therewith.

         (d)     Rights and obligations under any Stock Award granted before
amendment of the Plan shall not be impaired by any amendment of the Plan unless
(i) the Company requests the consent of the person to whom the Stock Award was
granted and (ii) such person consents in writing.

         (e)     The Board at any time, and from time to time, may amend the
terms of any one or more Stock Award; provided, however, that the rights and
obligations under any Stock Award shall not be impaired by any such amendment
unless (i) the Company requests the consent of the person to whom the Stock
Award was granted and (ii) such person consents in writing.

15.      TERMINATION OR SUSPENSION OF THE PLAN.

         (a)     The Board may suspend or terminate the Plan at any time.
Unless sooner terminated, the Plan shall terminate ten (10) years from the date
the Plan is adopted by the Board or approved by the stockholders of the
Company, whichever is earlier.  No Stock Awards may be granted under the Plan
while the Plan is suspended or after it is terminated.


                                      15.
<PAGE>   16
         (b)     Rights and obligations under any Stock Award granted while the
Plan is in effect shall not be impaired by suspension or termination of the
Plan, except with the consent of the person to whom the Stock Award was
granted.

16.      EFFECTIVE DATE OF PLAN.

         The Plan shall become effective as determined by the Board, but no
Stock Awards granted under the Plan shall be exercised unless and until the
Plan has been approved by the stockholders of the Company, which approval shall
be within twelve (12) months before or after the date the Plan is adopted by
the Board.


                                      16.

<PAGE>   1
                                                                   Exhibit 10.11


                                     AVIRON

                       1996 EMPLOYEE STOCK PURCHASE PLAN

                             ADOPTED MARCH 6, 1996

                     APPROVED BY STOCKHOLDERS JULY 22, 1996

                             AMENDED MARCH 12, 1998

                AMENDMENT APPROVED BY STOCKHOLDERS JUNE 4, 1998


1.       PURPOSE.

         (a)     The purpose of the 1996 Employee Stock Purchase Plan (the
"Plan") is to provide a means by which employees of Aviron, a Delaware
corporation (the "Company"), and its Affiliates, as defined in subparagraph
1(b), which are designated as provided in subparagraph 2(b), may be given an
opportunity to purchase stock of the Company.

         (b)     The word "Affiliate" as used in the Plan means any parent
corporation or subsidiary corporation of the Company, as those terms are
defined in Sections 424(e) and (f), respectively, of the Internal Revenue Code
of 1986, as amended (the "Code").

         (c)     The Company, by means of the Plan, seeks to retain the
services of its employees, to secure and retain the services of new employees,
and to provide incentives for such persons to exert maximum efforts for the
success of the Company.

         (d)     The Company intends that the rights to purchase stock of the
Company granted under the Plan be considered options issued under an "employee
stock purchase plan" as that term is defined in Section 423(b) of the Code.

2.       ADMINISTRATION.

         (a)     The Plan shall be administered by the Board of Directors (the
"Board") of the Company unless and until the Board delegates administration to
a Committee, as provided in subparagraph 2(c).  Whether or not the Board has
delegated administration, the Board shall have the final power to determine all
questions of policy and expediency that may arise in the administration of the
Plan.

         (b)     The Board shall have the power, subject to, and within the
limitations of, the express provisions of the Plan:

                 (i)      To determine when and how rights to purchase stock of
the Company shall be granted and the provisions of each offering of such rights
(which need not be identical).


                                       1.
<PAGE>   2
                 (ii)     To designate from time to time which Affiliates of
the Company shall be eligible to participate in the Plan.

                 (iii)     To construe and interpret the Plan and rights
granted under it, and to establish, amend and revoke rules and regulations for
its administration.  The Board, in the exercise of this power, may correct any
defect, omission or inconsistency in the Plan, in a manner and to the extent it
shall deem necessary or expedient to make the Plan fully effective.

                 (iv)     To amend the Plan as provided in paragraph 13.

                 (v)      Generally, to exercise such powers and to perform
such acts as the Board deems necessary or expedient to promote the best
interests of the Company and its Affiliates and to carry out the intent that
the Plan be treated as an "employee stock purchase plan" within the meaning of
Section 423 of the Code.

         (c)     The Board may delegate administration of the Plan to a
Committee composed of not fewer than two (2) members of the Board (the
"Committee").  If administration is delegated to a Committee, the Committee
shall have, in connection with the administration of the Plan, the powers
theretofore possessed by the Board, subject, however, to such resolutions, not
inconsistent with the provisions of the Plan, as may be adopted from time to
time by the Board.  The Board may abolish the Committee at any time and revest
in the Board the administration of the Plan.

3.       SHARES SUBJECT TO THE PLAN.

         (a)     Subject to the provisions of paragraph 12 relating to
adjustments upon changes in stock, the stock that may be sold pursuant to
rights granted under the Plan shall not exceed in the aggregate three hundred
fifty thousand (350,000) shares of the Company's common stock (the "Common
Stock"). If any right granted under the Plan shall for any reason terminate
without having been exercised, the Common Stock not purchased under such right
shall again become available for the Plan.

         (b)     The stock subject to the Plan may be unissued shares or
reacquired shares, bought on the market or otherwise.

4.       GRANT OF RIGHTS; OFFERING.

         The Board or the Committee may from time to time grant or provide for
the grant of rights to purchase Common Stock of the Company under the Plan to
eligible employees (an "Offering") on a date or dates (the "Offering Date(s)")
selected by the Board or the Committee.  Each Offering shall be in such form
and shall contain such terms and conditions as the Board or the Committee shall
deem appropriate, which shall comply with the requirements of Section 423(b)(5)
of the Code that all employees granted rights to purchase stock under the Plan
shall have the same rights and privileges.  The terms and conditions of an
Offering shall be


                                       2.
<PAGE>   3
incorporated by reference into the Plan and treated as part of the Plan.  The
provisions of separate Offerings need not be identical, but each Offering shall
include (through incorporation of the provisions of this Plan by reference in
the document comprising the Offering or otherwise) the period during which the
Offering shall be effective, which period shall not exceed twenty-seven (27)
months beginning with the Offering Date, and the substance of the provisions
contained in paragraphs 5 through 8, inclusive.

5.       ELIGIBILITY.

         (a)     Rights may be granted only to employees of the Company or, as
the Board or the Committee may designate as provided in subparagraph 2(b), to
employees of any Affiliate of the Company.  Except as provided in subparagraph
5(b), an employee of the Company or any Affiliate shall not be eligible to be
granted rights under the Plan, unless, on the Offering Date, such employee has
been in the employ of the Company or any Affiliate for such continuous period
preceding such grant as the Board or the Committee may require, but in no event
shall the required period of continuous employment be greater than two (2)
years.  In addition, unless otherwise determined by the Board or the Committee
and set forth in the terms of the applicable Offering, no employee of the
Company or any Affiliate shall be eligible to be granted rights under the Plan,
unless, on the Offering Date, such employee's customary employment with the
Company or such Affiliate is for at least twenty (20) hours per week and at
least five (5) months per calendar year.

         (b)     The Board or the Committee may provide that, each person who,
during the course of an Offering, first becomes an eligible employee of the
Company or designated Affiliate will, on a date or dates specified in the
Offering which coincides with the day on which such person becomes an eligible
employee or occurs thereafter, receive a right under that Offering, which right
shall thereafter be deemed to be a part of that Offering.  Such right shall
have the same characteristics as any rights originally granted under that
Offering, as described herein, except that:

                 (i)      the date on which such right is granted shall be the
"Offering Date" of such right for all purposes, including determination of the
exercise price of such right;

                 (ii)     the period of the Offering with respect to such right
shall begin on its Offering Date and end coincident with the end of such
Offering; and

                 (iii)     the Board or the Committee may provide that if such
person first becomes an eligible employee within a specified period of time
before the end of the Offering, he or she will not receive any right under that
Offering.

         (c)     No employee shall be eligible for the grant of any rights
under the Plan if, immediately after any such rights are granted, such employee
owns stock possessing five percent (5%) or more of the total combined voting
power or value of all classes of stock of the Company or of any Affiliate.  For
purposes of this subparagraph 5(c), the rules of Section


                                       3.
<PAGE>   4
424(d) of the Code shall apply in determining the stock ownership of any
employee, and stock which such employee may purchase under all outstanding
rights and options shall be treated as stock owned by such employee.

         (d)     An eligible employee may be granted rights under the Plan only
if such rights, together with any other rights granted under "employee stock
purchase plans" of the Company and any Affiliates, as specified by Section
423(b)(8) of the Code, do not permit such employee's rights to purchase stock
of the Company or any Affiliate to accrue at a rate which exceeds twenty five
thousand dollars ($25,000) of fair market value of such stock (determined at
the time such rights are granted) for each calendar year in which such rights
are outstanding at any time.

         (e)     Officers of the Company and any designated Affiliate shall be
eligible to participate in Offerings under the Plan, provided, however, that
the Board may provide in an Offering that certain employees who are highly
compensated employees within the meaning of Section 423(b)(4)(D) of the Code
shall not be eligible to participate.

6.       RIGHTS; PURCHASE PRICE.

         (a)     On each Offering Date, each eligible employee, pursuant to an
Offering made under the Plan, shall be granted the right to purchase up to the
number of shares of Common Stock of the Company purchasable with a percentage
designated by the Board or the Committee not exceeding fifteen percent (15%) of
such employee's Earnings (as defined in subparagraph 7(a)) during the period
which begins on the Offering Date (or such later date as the Board or the
Committee determines for a particular Offering) and ends on the date stated in
the Offering, which date shall be no later than the end of the Offering.  The
Board or the Committee shall establish one or more dates during an Offering
(the "Purchase Date(s)") on which rights granted under the Plan shall be
exercised and purchases of Common Stock carried out in accordance with such
Offering.

         (b)     In connection with each Offering made under the Plan, the
Board or the Committee may specify a maximum number of shares that may be
purchased by any employee as well as a maximum aggregate number of shares that
may be purchased by all eligible employees pursuant to such Offering.  In
addition, in connection with each Offering that contains more than one Purchase
Date, the Board or the Committee may specify a maximum aggregate number of
shares which may be purchased by all eligible employees on any given Purchase
Date under the Offering.  If the aggregate purchase of shares upon exercise of
rights granted under the Offering would exceed any such maximum aggregate
number, the Board or the Committee shall make a pro rata allocation of the
shares available in as nearly a uniform manner as shall be practicable and as
it shall deem to be equitable.

         (c)     The purchase price of stock acquired pursuant to rights
granted under the Plan shall be not less than the lesser of:


                                       4.
<PAGE>   5
                 (i)      an amount equal to eighty-five percent (85%) of the
fair market value of the stock on the Offering Date; or

                 (ii)     an amount equal to eighty-five percent (85%) of the
fair market value of the stock on the Purchase Date.

7.       PARTICIPATION; WITHDRAWAL; TERMINATION.

         (a)     An eligible employee may become a participant in the Plan
pursuant to an Offering by delivering a participation agreement to the Company
within the time specified in the Offering, in such form as the Company
provides.  Each such agreement shall authorize payroll deductions of up to the
maximum percentage specified by the Board or the Committee of such employee's
Earnings during the Offering.  "Earnings" is defined as an employee's regular
salary or wages (including amounts thereof elected to be deferred by the
employee, that would otherwise have been paid, under any arrangement
established by the Company that is intended to comply with Section 125, Section
401(k), Section 402(h) or Section 403(b) of the Code or that provides
non-qualified deferred compensation), which shall include overtime pay, but
shall exclude bonuses, commissions, incentive pay, profit sharing, other
remuneration paid directly to the employee, the cost of employee benefits paid
for by the Company or an Affiliate, education or tuition reimbursements,
imputed income arising under any group insurance or benefit program, traveling
expenses, business and moving expense reimbursements, income received in
connection with stock options, contributions made by the Company or an
Affiliate under any employee benefit plan, and similar items of compensation,
or such other set of inclusions or exclusions as may be determined by the Board
or the Committee.  The payroll deductions made for each participant shall be
credited to an account for such participant under the Plan and shall be
deposited with the general funds of the Company.  A participant may reduce
(including to zero) or increase such payroll deductions, and an eligible
employee may begin such payroll deductions, after the beginning of any Offering
only as provided for in the Offering.  A participant may make additional
payments into his or her account only if specifically provided for in the
Offering and only if the participant has not had the maximum amount withheld
during the Offering.

         (b)     At any time during an Offering, a participant may terminate
his or her payroll deductions under the Plan and withdraw from the Offering by
delivering to the Company a notice of withdrawal in such form as the Company
provides.  Such withdrawal may be elected at any time prior to the end of the
Offering except as provided by the Board or the Committee in the Offering.
Upon such withdrawal from the Offering by a participant, the Company shall
distribute to such participant all of his or her accumulated payroll deductions
(reduced to the extent, if any, such deductions have been used to acquire stock
for the participant) under the Offering, without interest, and such
participant's interest in that Offering shall be automatically terminated.  A
participant's withdrawal from an Offering will have no effect upon such
participant's eligibility to participate in any other Offerings under the Plan
but such participant will be required to deliver a new participation agreement
in order to participate in subsequent Offerings under the Plan.


                                       5.
<PAGE>   6
         (c)     Rights granted pursuant to any Offering under the Plan shall
terminate immediately upon cessation of any participating employee's employment
with the Company and any designated Affiliate, for any reason, and the Company
shall distribute to such terminated employee all of his or her accumulated
payroll deductions (reduced to the extent, if any, such deductions have been
used to acquire stock for the terminated employee) under the Offering, without
interest.

         (d)     Rights granted under the Plan shall not be transferable by a
participant otherwise than by will or the laws of descent and distribution, or
by a beneficiary designation as provided in paragraph 14 and, otherwise during
his or her lifetime, shall be exercisable only by the person to whom such
rights are granted.

8.       EXERCISE.

         (a)     On each Purchase Date specified therefor in the relevant
Offering, each participant's accumulated payroll deductions and other
additional payments specifically provided for in the Offering (without any
increase for interest) will be applied to the purchase of whole shares of stock
of the Company, up to the maximum number of shares permitted pursuant to the
terms of the Plan and the applicable Offering, at the purchase price specified
in the Offering.  No fractional shares shall be issued upon the exercise of
rights granted under the Plan.  The amount, if any, of accumulated payroll
deductions remaining in each participant's account after the purchase of shares
which is less than the amount required to purchase one share of stock on the
final Purchase Date of an Offering shall be held in each such participant's
account for the purchase of shares under the next Offering under the Plan,
unless such participant withdraws from such next Offering, as provided in
subparagraph 7(b), or is no longer eligible to be granted rights under the
Plan, as provided in paragraph 5, in which case such amount shall be
distributed to the participant after such final Purchase Date, without
interest.  The amount, if any, of accumulated payroll deductions remaining in
any participant's account after the purchase of shares which is equal to the
amount required to purchase whole shares of stock on the final Purchase Date of
an Offering shall be distributed in full to the participant after such Purchase
Date, without interest.

         (b)     No rights granted under the Plan may be exercised to any
extent unless the shares to be issued upon such exercise under the Plan
(including rights granted thereunder) are covered by an effective registration
statement pursuant to the Securities Act of 1933, as amended (the "Securities
Act") and the Plan is in material compliance with all applicable state, foreign
and other securities and other laws applicable to the Plan.  If on a Purchase
Date in any Offering hereunder the Plan is not so registered or in such
compliance, no rights granted under the Plan or any Offering shall be exercised
on such Purchase Date, and the Purchase Date shall be delayed until the Plan is
subject to such an effective registration statement and such compliance, except
that the Purchase Date shall not be delayed more than twelve (12) months and
the Purchase Date shall in no event be more than twenty-seven (27) months from
the Offering Date.  If on the Purchase Date of any Offering hereunder, as
delayed to the maximum extent permissible, the Plan is not registered and in
such compliance, no rights granted under the Plan


                                       6.
<PAGE>   7
or any Offering shall be exercised and all payroll deductions accumulated
during the Offering (reduced to the extent, if any, such deductions have been
used to acquire stock) shall be distributed to the participants, without
interest.

9.       COVENANTS OF THE COMPANY.

         (a)     During the terms of the rights granted under the Plan, the
Company shall keep available at all times the number of shares of stock
required to satisfy such rights.

         (b)     The Company shall seek to obtain from each federal, state,
foreign or other regulatory commission or agency having jurisdiction over the
Plan such authority as may be required to issue and sell shares of stock upon
exercise of the rights granted under the Plan.  If, after reasonable efforts,
the Company is unable to obtain from any such regulatory commission or agency
the authority which counsel for the Company deems necessary for the lawful
issuance and sale of stock under the Plan, the Company shall be relieved from
any liability for failure to issue and sell stock upon exercise of such rights
unless and until such authority is obtained.

10.      USE OF PROCEEDS FROM STOCK.

         Proceeds from the sale of stock pursuant to rights granted under the
Plan shall constitute general funds of the Company.

11.      RIGHTS AS A STOCKHOLDER.

         A participant shall not be deemed to be the holder of, or to have any
of the rights of a holder with respect to, any shares subject to rights granted
under the Plan unless and until the participant's shareholdings acquired upon
exercise of rights under the Plan are recorded in the books of the Company.

12.      ADJUSTMENTS UPON CHANGES IN STOCK.

         (a)     If any change is made in the stock subject to the Plan, or
subject to any rights granted under the Plan (through merger, consolidation,
reorganization, recapitalization, reincorporation, stock dividend, dividend in
property other than cash, stock split, liquidating dividend, combination of
shares, exchange of shares, change in corporate structure or other transaction
not involving the receipt of consideration by the Company), the Plan and
outstanding rights will be appropriately adjusted in the class(es) and maximum
number of shares subject to the Plan and the class(es) and number of shares and
price per share of stock subject to outstanding rights.  Such adjustments shall
be made by the Board or the Committee, the determination of which shall be
final, binding and conclusive.  (The conversion of any convertible securities
of the Company shall not be treated as a "transaction not involving the receipt
of consideration by the Company.")


                                       7.
<PAGE>   8
         (b)     In the event of:  (1) a dissolution or liquidation of the
Company; (2) a merger or consolidation in which the Company is not the
surviving corporation; (3) a reverse merger in which the Company is the
surviving corporation but the shares of the Company's Common Stock outstanding
immediately preceding the merger are converted by virtue of the merger into
other property, whether in the form of securities, cash or otherwise; or (4)
the acquisition by any person, entity or group within the meaning of Section
13(d) or 14(d) of the Securities Exchange Act of 1934, as amended (the
"Exchange Act") or any comparable successor provisions (excluding any employee
benefit plan, or related trust, sponsored or maintained by the Company or any
Affiliate of the Company) of the beneficial ownership (within the meaning of
Rule 13d-3 promulgated under the Exchange Act, or comparable successor rule) of
securities of the Company representing at least fifty percent (50%) of the
combined voting power entitled to vote in the election of directors, then, as
determined by the Board in its sole discretion (i) any surviving or acquiring
corporation may assume outstanding rights or substitute similar rights for
those under the Plan, (ii) such rights may continue in full force and effect,
or (iii) participants' accumulated payroll deductions may be used to purchase
Common Stock immediately prior to the transaction described above and the
participants' rights under the ongoing Offering terminated.

13.      AMENDMENT OF THE PLAN.

         (a)     The Board at any time, and from time to time, may amend the
Plan.  However, except as provided in paragraph 12 relating to adjustments upon
changes in stock, no amendment shall be effective unless approved by the
stockholders of the Company within twelve (12) months before or after the
adoption of the amendment, where the amendment will:

                 (i)      Increase the number of shares reserved for rights
under the Plan;

                 (ii)     Modify the provisions as to eligibility for
         participation in the Plan (to the extent such modification requires
         stockholder approval in order for the Plan to obtain employee stock
         purchase plan treatment under Section 423 of the Code or to comply
         with the requirements of Rule 16b-3 promulgated under the Securities
         Exchange Act of 1934, as amended ("Rule 16b-3")); or

                 (iii)     Modify the Plan in any other way if such
         modification requires stockholder approval in order for the Plan to
         obtain employee stock purchase plan treatment under Section 423 of the
         Code or to comply with the requirements of Rule 16b-3.

It is expressly contemplated that the Board may amend the Plan in any respect
the Board deems necessary or advisable to provide eligible employees with the
maximum benefits provided or to be provided under the provisions of the Code
and the regulations promulgated thereunder relating to employee stock purchase
plans and/or to bring the Plan and/or rights granted under it into compliance
therewith.


                                       8.
<PAGE>   9
         (b)     Rights and obligations under any rights granted before
amendment of the Plan shall not be impaired by any amendment of the Plan,
except with the consent of the person to whom such rights were granted, or
except as necessary to comply with any laws or governmental regulations, or
except as necessary to ensure that the Plan and/or rights granted under the
Plan comply with the requirements of Section 423 of the Code.

14.      DESIGNATION OF BENEFICIARY.

         (a)     A participant may file a written designation of a beneficiary
who is to receive any shares and cash, if any, from the participant's account
under the Plan in the event of such participant's death subsequent to the end
of an Offering but prior to delivery to the participant of such shares and
cash.  In addition, a participant may file a written designation of a
beneficiary who is to receive any cash from the participant's account under the
Plan in the event of such participant's death during an Offering.

         (b)     Such designation of beneficiary may be changed by the
participant at any time by written notice.  In the event of the death of a
participant and in the absence of a beneficiary validly designated under the
Plan who is living at the time of such participant's death, the Company shall
deliver such shares and/or cash to the executor or administrator of the estate
of the participant, or if no such executor or administrator has been appointed
(to the knowledge of the Company), the Company, in its sole discretion, may
deliver such shares and/or cash to the spouse or to any one or more dependents
or relatives of the participant, or if no spouse, dependent or relative is
known to the Company, then to such other person as the Company may designate.

15.      TERMINATION OR SUSPENSION OF THE PLAN.

         (a)     The Board in its discretion, may suspend or terminate the Plan
at any time.  No rights may be granted under the Plan while the Plan is
suspended or after it is terminated.

         (b)     Rights and obligations under any rights granted while the Plan
is in effect shall not be impaired by suspension or termination of the Plan,
except as expressly provided in the Plan or with the consent of the person to
whom such rights were granted, or except as necessary to comply with any laws
or governmental regulation, or except as necessary to ensure that the Plan
and/or rights granted under the Plan comply with the requirements of Section
423 of the Code.

16.      EFFECTIVE DATE OF PLAN.

         The Plan shall become effective on the same day that the Company's
initial public offering of shares of common stock becomes effective (the
"Effective Date"), but no rights granted under the Plan shall be exercised
unless and until the Plan has


                                       9.
<PAGE>   10
been approved by the stockholders of the Company within twelve (12) months
before or after the date the Plan is adopted by the Board or the Committee,
which date may be prior to the Effective Date.


                                       10.

<PAGE>   1
                                                                    EXHIBIT 23.1


               CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS

     We consent to the incorporation by reference in Registration Statement
(Form S-8) pertaining to the 1996 Equity Incentive Plan and 1996 Employee Stock
Purchase Plan of Aviron of our report dated February 13, 1998, with respect to
the financial statements of Aviron for the year ended December 31, 1997 included
in its Annual Report on Form 10-K, filed with the Securities and Exchange
Commission.

                                                               Ernst & Young LLP

Palo Alto, California
July 9, 1998








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