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Abstract
In five Tanzanian villages, nets impregnated with permethrin or lambdacyhalothrin
were given out. The people received them enthusiastically and brought their nets for
re-impregnation at six monthly intervals. Bioassays showed that the insecticidal power
of permethrin impregnated nets remained adequate for six months unless the nets were
washed. Nets with 30 mg lambdacyhalothrin/m2 retained high insecticidal power despite
washing, but this dose caused temporary cold-like symptoms in those sleeping under
freshly treated dry nets. Methods by which durable bednets might be made affordable
by Tanzanian villagers are discussed.