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The repeated intravenous injections (RIVInj) of 5 mg/kg/day leptophos [O-(4-bromo-2, 5-dichlorophenyl) O-methyl phenylphosphonothioate] for 3 consecutive days caused delayed ataxia in 4 out of 9 hens (44.4%). And one out of 9 hens (11.1%) given RIVInj of 3 mg/kg leptophos for 5 days was affected with ataxia. Twenty hens, however, which received a single intravenous injection (SIVInj) of 15 mg/kg leptophos did not exhibit any delayed neuropathic signs at all. Thus, delayed neurotoxicity was increased by the subdividing RIVInj of the critical dose which was shown in the SIVInj of leptophos. The leptophos concentration in plasma and liver decreased very rapidly after finish of either SIVInj or RIVInj. Although no significant differences were observed in the biological half life of leptophos in plasma by different dosages, the mean level of leptophos decreased significantly with frequency of injections. On the contrary, the evident accumulation of leptophos was observed in only sciatic nerve with RIVInj. Leg muscle maintained relatively high level of leptophos after the last injection. These results suggest that leptophos seems to transfer from blood to affinitive tissues such as sciatic nerve or leg muscles and to accumulate there easily in initial stage after repeated iv injections, and that this causes the enhancement of neuropathy with repeated administrations of divided critical dose of leptophos in both iv and oral administration.

Delayed neurotoxicity and toxicokinetics of leptophos in hens given repeatedly by low-dose intravenous injections.