Abstract
Following reports in 1970 that parathion is hazardous to tobacco workers even though label instructions have been followed, the cholinesterase levels of 44 individuals were monitored during the 1971 harvesting season in the cigar-wrapper district of Quincy, Fla. Despite contact with parathion residues, as shown by appearance of p-nitrophenol in urine and up to 5 ppm of toxicant on leaves, no member of the harvesting teams on the three farms examined showed any evidence of significant depression of red blood cell cholinesterase, although one worker had slight inhibition of plasma cholinesterase.
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