Abstract
PESTICIDES are used intensively in agriculture in the vicinity of Wenatchee, Waslh. Direct measurement of dermal and respiratory exposure of sprayer operators in this area to parathion was reported by Batchelor and Walker in 1954 (1). A survey designed to evaluate the hazard of organic phosphorus insecticides was carried out in this same locality during 1951 (2). It was found that definitelv exposed persons showed a significant reduction in average choliniesteirase valuties anid an increase in illnesses conisisten-t with poisoning dur ing the period of tlheir exposure. Tlhere was no evidenice of either reduced cholinesterase activity or increased illness during the spray season in persons with little or no exposur e to inisecticides. This survey was continuted duiring the 1952 and 1953 seasons. The present paper preseints the resuLlts of that work.
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