REGISTRANT'S 1983 EMPLOYEE STOCK PURCHASE PLAN
(FORMERLY MONOCLONAL ANTIBODIES, INC.)
1983 EMPLOYEE STOCK PURCHASE PLAN
(AS AMENDED THROUGH MARCH 31, 1996)
The following constitute the provisions of the 1983 Employee Stock Purchase Plan (herein called the "Plan") of
Quidel Corporation, a Delaware corporation (herein called the "Company").
1. PURPOSE. The purpose of the Plan is to provide employees of the Company and its Designated Subsidiaries
with an opportunity to purchase Common Stock of the Company through accumulated payroll deductions. It is
the intention of the Company to have the Plan qualify as an "Employee Stock Purchase Plan" under Section 423
of the Internal Revenue Code of 1986, as amended. The provisions of the Plan shall, accordingly, be construed
so as to extend and limit participation in a manner consistent with the requirements of that section of the Code.
(a) "Board" shall mean the Board of Directors of the Company.
(b) "Code" shall mean the Internal Revenue Code of 1986, as amended.
(c) "Common Stock" shall mean the Common Stock, no par value, of the Company.
(d) "Company" shall mean Quidel Corporation, a Delaware corporation.
(e) "Compensation" shall mean all regular straight time earnings, payments or overtime, shift premium, incentive
compensation, incentive payments, bonuses and commissions (except to the extent that the exclusion of any such
items for all participants is specifically directed by the Board or its committee).
(f) "Designated Subsidiaries" shall mean the Subsidiaries which have been designated by the Board from time to
time in its sole discretion as eligible to participate in the Plan.
(g) "Employee" shall mean any person, including an officer, who is customarily employed for at least twenty (20)
hours per week and more than five (5) months in a calendar year by the Company or one of its Designated
(h) "Exercise Date" shall mean the last day of each offering period of the