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    Peer Reviewed

    Comparative performances, under laboratory conditions, of seven pyrethroid insecticides used for impregnation of mosquito nets. [Performances comparées, dans des conditions de laboratoire, de sept insecticides à base de pyréthroïde utilisés pour l'imprégnation des moustiquaires]

    Hougard JM; Duchon S; Darriet F; Zaim M; Rogier C

    Bulletin of the World Health Organization. 2003 May; 81(5):324-333.

    Objective: To compare the efficacy of seven pyrethroid insecticides for impregnation of mosquito nets, six currently recommended by WHO and one candidate (bifenthrin), under laboratory conditions. Methods: Tests were conducted using pyrethroid-susceptible and pyrethroid-resistant strains of Anopheles gambiae and Culex quinquefasciatus. Knock-down effect, irritancy and mortality were measured using standard WHO cone tests. Mortality and bloodfeeding inhibition were also measured using a baited tunnel device. Findings: For susceptible A. gambiae, alpha-cypermethrin had the fastest knock-down effect. For resistant A. gambiae, the knockdown effect was slightly slower with alpha-cypermethrin and much reduced following exposure to the other insecticides, particularly bifenthrin and permethrin. For susceptible C. quinquefasciatus, the knock-down effect was significantly slower than in A. gambiae, particularly with bifenthrin, and no knock-down effect was observed with any of the pyrethroids against the resistant strain. Bifenthrin was significantly less irritant than the other pyrethroids to susceptible and resistant A. gambiaebut there was no clear ranking of pyrethroid irritancy against C. quinquefasciatus. In tunnels, all insecticides were less toxic against C. quinquefasciatusthan against A. gambiaefor susceptible strains. For resistant strains, mortality was significant with all the pyrethroids with A. gambiaebut not with C. quinquefasciatus. Inhibition of blood-feeding was also high for susceptible strains of both species and for resistant A. gambiaebut lower for resistant C. quinquefasciatus; bifenthrin had the greatest impact. Conclusions: Efficacy for impregnation of mosquito nets against A. gambiae was greatest with alpha-cypermethrin. Bifenthrin is likely to have a significant comparative advantage over other pyrethroids in areas with pyrethroid resistance because of its much stronger impact on the nuisance mosquito, C. quinquefasciatus, despite its slower knock-down effect and irritancy. Selection of pyrethroids for mosquito vector control and personal protection should take into account the different effects of these insecticides, the status of pyrethroid resistance in the target area, and the importance of nuisance mosquitoes, such as C. quinquefasciatus. (author's)
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