Abstract
Exposure of agricultural workers and the general population to pesticides is a major concern, and possible summation or synergistic effects deserves particular attention. In this study, however, combined dietary administration of 19 organophosphorus compounds and one organochlorine pesticide, each at acceptable daily intake (ADI) levels, did not enhance rat liver preneoplastic lesion development initiated by d iethylnitrosamine. In contrast, a mixture of 100 times ADI significantly increased the number and area of lesions. The results thus provide direct support for the present safety factor approach to the quantitative hazard evaluation of pesticides.
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