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Residues of DDT and its metabolites in human blood samples in Delhi, India.

Blood samples from 182 people in Delhi, India, were examined for DDT residues. All except 8 contained DDT and its metabolites. The average total DDT concentration in the whole blood ranged from 0.177 to 0.683 mg/litre in males and from 0.166 to 0.329 mg/litre in females. The DDT metabolites detected were p,p'-DDE, p,p'-DDD, and o,p'-DDT. DDE accounted for most of the total DDT.