Sleeve Tests with Malathion Powders against DDT-Resistant Body Lice

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Abstract
Malathion applied to cloth sleeves worn by men continued to give 100% mortality of lice for 17 days at 1%, 13-14 days at 0.5%, 6-7 days at 0.25%, and 3 days at 0.1%, as compared with 99-100% mortality for 13-14 days with a standard louse powder containing synergized pyrethrum (0.2% of pyrethrins), and for 3 days with 1% of lindane. Although no toxic effects were observed, the dosage per man in these sleeve tests was only one-ninth the normal dosage for louse powders, therefore recommendation for the use of malathion on humans must await further studies.

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