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We measured serum levels of 11 pesticide residues and metabolites in 85 rural-dwelling persons. In general, the serum levels increased with age, with males having slightly higher levels than females. Consumption of eggs from home-raised hens contributed substantially to increased serum concentrations of trans-nonachlor, heptachlor epoxide, and oxychlordane; consumption of home-grown root vegetables likewise contributed to increased serum concentrations of trans-nonachlor and oxychlordane. Health risks, if any, that may be attributable to these "background" levels of exposure remain to be fully characterized in this, and all other, affected populations.

A survey of measured levels and dietary sources of selected organochlorine pesticide residues and metabolites in human sera from a rural population.