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Contrasting resistance patterns to type Ⅰ and Ⅱ pyrethroids in two major arbovirus vectors Aedes aegypti and Aedes albopictus in the Republic of the Congo, Central Africa

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Infectious diseases of Poverty 2020年第2期9卷 95-95页

作者： Basile Kamgang Theodel A.Wilson-Bahun Aurelie P.Yougang Arsene Lenga Charles S.Wondji centre for research in infeaious diseases Department of Medical EntomologyPO Box 15391YaoundeCameroon 不详

Background:In the Republic of Congo,with two massive outbreaks of chikungunya observed this decade,little is known about the insecticide resistance profile of the two major arbovirus vectors Aedes aegypti and Aedes ***,we established the resistance profile of both species to insecticides and explored the resistance mechanisms to help Congo to better prepare for future ***:Immature stages o f *** and *** were sampled in May 2017 in eight cities of the Republic of the Congo and reared to adult *** and adult bioassays,and synergist(piperonyl butoxide[PBO])assays were carried out according to WHO guidelines.F1534C mutation was genotyped in field collected adults in both species and the polymorphism of the sodium channel gene assessed in ***:All tested populations were susceptible to temephos after larval bioassays.A high resistance level was observed to 4%DDT in both species countrywide(21.9-88.3% mortality).All but one population(*** from Ngo)exhibited resistance to type I pyrethroid,permethrin,but showed a full susceptibility to type II pyrethroid(deltamethrin)in almost all *** was also reported to 1% propoxur in *** likewise in two *** populations(Owando and Ouesso),and the remaining were fully *** populations of both species were fully susceptible to 1%fenitrothion.A full recovery of susceptibility was observed in *** and *** when pre-exposed to PBO and then to propoxur and permethrin *** F1534C kdr mutation was not detected in either *** high genetic variability of the portion of sodium channel spanning the F1534C in *** further supported that knockdown resistance probably play no role in the permethrin ***:Our study showed that both Aedes species were susceptible to organophosphates(temephos and fenitrothion),while for other insecticide classes tested the profile of resistance vary a

关键词： Aedes oegypti Aedes albopictus Insecticide resistance Resistance mechanism Republic of the Congo

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