Attachment 1 , Page 9 
NATURE OF MEDICAL SURVEILLANCE 
In its essence, tnedical surveillance of biotechnology workers consists of 
periodic evaluation; regular analysis of data; and regular conmunlcatlon of 
results to workers, management, and other Interested parties. 
The components of a medical surveillance program for recombinant DNA workers 
which were considered by the Working Group are as follows: 
a. preemployment examination and collection of baseline serum samples for 
storage; 
b. periodic follow*up examination; 
c. follow-up evaluation of all Illnesses, especially those which cause 
absence from work; 
d. epidemiological and other longer term follow-up studies. 
Preewploy ment Ex aminations - The purposes of preemployment examinations 
are (1) to establish a worker's health status prior to the start of work; (2) 
to provide baseline data for possible epidemiologic studies; and (3) to 
Identify conditions which may place a worker at heightened risk of 
work-related Illness. Workers with such conditions may be excluded from 
employment in biotechnology; fitness for employment In biotechnology must be 
established on an Individual basis for each potential worker with any 
underlying medical condition. Among the conditions which may place a worker 
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at heightened risk of Illness In biotechnology are the following: 
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