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Mild structural and functional changes were observed in liver and testes of rats after a single intraperitoneal administration of diazinon (21.6 mg/kg). Kidney, however, showed no pathological lesion. Attempts are made to correlate the pathological changes in these organs with the activity of succinic dehydrogenase, adenosine triphosphatase and alkaline phosphatase.

Exposure of male rats to parathion (2.6 mg/kg), lindane (17.6 mg/kg), or their combination through oral intubation daily for a period of 90 days produced histological and biochemical alterations in the liver and testis. The focal necrosis of the liver, although observed in all the treatments, was very prominent in the animals exposed to lindane alone. The kidney and epididymis, however, did not show any significant histological lesions. The activity of acetylcholine esterase in blood and brain decreased markedly, whereas that of succinic dehydrogenase, adenosine triphosphatase, and the alkaline and acid phosphate in liver and testis showed significant alterations for all three treatments.

Exposure of male rats to DDVP (21.4 mg/kg/day) through dermal painting for a period of 90 days did not produce any changes in skin or testis. None of the animals showed any clinical symptoms of DDVP poisoning or mortality during experimentation. Rapid degradation of DDVP and further its detoification in in liver of rats and other species of mammals seems to be the prime reason for the non-toxic effect of the insecticide.