LABORATORY PROTECTION RATE OF TORN BEDNETS TREATED WITH THREE DOSAGES OF PYRETHROIDE AGAINST ANOPHELES CULICIFACIES

For the prevention of human malaria, vector control is an important component of theglobal strategy. the objective of the present study was to observe the effect of impregnated tornbednets with three dosages of cyfluthrin 5% on the number of bites by anopheles culicifacies. aglass made tunnel test was designed and hungry female mosquitoes were induce to pass throughholes cut in the pyrethroid treated nets. a guinea pig used as bait to attract mosquitoes throughcircular holes in the netting. with untreated netting, 72-87% of laboratory-reared females passedthrough the holes overnight and 64-92% blood-fed successfully. when the netting was treated withcyfluthrin at doses of 25, 50 and 100 mg a.i./m2, the entry index (the proportions that passedthrough the holes overnight) were 43.37%, 42.82% and 24.72%; mortality rates were 66.31%,81.45% and 95.99%; and the feeding rate were 45%, 27% and 3%, respectively. pyrethroidimpregnated bednets using “tunnel tests” showing acceptable protection rate both in lower andhigher dosages. in addition, the higher dosages of these three dosages pyrethroid provided goodlevels of protection against an. culicifacies.