Hematological biomarkers in farm workers exposed to organophosphorus pesticides in the Gaza Strip.

To assess serum cholinesterase levels and symptoms among farm workers who used mainly organophosphorus pesticides in the Gaza Strip, the authors took blood samples from and administered symptom questionnaires to an occupational cohort of 48 field workers. The authors tested the workers for serum acetylcholinesterase and serum butyrylcholinesterase (SBuChE) levels at the beginning and end of each work day. The authors took 20 employees as referents. The mean activity of SBuChE of the farm workers at the end of the spraying day (X = 3.28+/-0.12 kU/l) was lower by 13.2% than that of the referents at the end of the follow-up day (3.78+/-0.20 kU/l). Many symptoms were self-reported by farm workers. Certain symptoms, such as itching, skin irritation, and a burning sensation in eyes or face, were significantly associated with cholinesterase inhibition. A greater end-of-day reduction in SBuChE activity occurred in younger workers, those workers mixing pesticides, and with day of direct re-entry to the workplace. The authors detected alterations in some blood indexes. The study confirmed the finding that illness in pesticide workers exposed to organophosphorus pesticides can occur with trivial reductions in cholinesterase.