Organophosphate pesticide levels in blood and urine of women and newborns living in an agricultural community

► We measured organophosphate pesticides in blood and urine of mothers and newborns. ► We determined paraoxonase 1 genotypes and enzyme activities. ► Chlorpyrifos was detectable in 70.5% and 87.5% of maternal and cord blood samples. ► Increased maternal paraoxonase 1 levels resulted in lower organophosphate detection in cord blood.