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High efficacy of chlorfenapyr-based net interceptor■g2 against pyrethroid-resistant malaria vectors from Cameroon

Infectious Diseases of Poverty 2023年第4期12卷 1-16页

作者： Magellan Tchouakui Riccado F.Thiomela Elysee Nchoutpouen Benjamin D.Menze Cyrille Ndo Dorothy Achu Raymond N.Tabue Flobert Njiokou Ateba Joel Charles S.Wondji Centre for Research in Infectious Diseases(CRID) P.O.Box 13501YaoundéCameroon Department of Animal Biology and Physiology Faculty of ScienceUniversity of Yaoundé1P.O.Box 812YaoundéCameroon Department of Biological Sciences Faculty of Medicine and Pharmaceutical SciencesUniversity of DoualaP.O.Box 24157DoualaCameroon Ministry of Public Health National Malaria Control ProgrammeP.O.Box 14386YaoundeCameroon Department of Vector Biology Liverpool School of Tropical MedicinePembroke PlaceLiverpoolL35QAUK International Institute of Tropical Agriculture(IITA) P.O.Box 2008YaoundéCameroon

Background The increasing reports of resistance to pyrethroid insecticides associated with reduced efficacy of pyrethroid-only interventions highlight the urgency of introducing new non-pyrethroid-only control ***,we investigated the performance of piperonyl-butoxide(PBO)-pyrethroid[Permanet 3.0(P3.0)]and dual active ingredients(AI)nets[interceptor g2(Ig2):containing pyrethroids and chlorfenapyr and Royal guard(Rg):containing pyrethroids and pyriproxyfen]compared to pyrethroid-only net Royal Sentry(RS)against pyrethroid-resistant malaria vectors in *** The efficacy of these tools was firstly evaluated onAnopheles gambiae *** funestus *** gounougou,Mibellon,Mangoum,Nkolondom,and Elende using cone/tunnel *** addition,experimental hut trials(EHT)were performed to evaluate the performance of unwashed and 20 times washed nets in semi-field ***,pyrethroid-resistant markers were genotyped in dead vs alive,blood-fed vs unfed mosquitoes after exposure to the nets to evaluate the impact of these markers on net *** XLSTAT software was used to calculate the various entomological outcomes and the Chi-square test was used to compare the efficacy of various *** odds ratio and Fisher exact test were then used to establish the statistical significance of any association between insecticide resistance markers and bed net *** interceptor g2 was the most effective net against wild *** followed by Permanet *** EHT,this net induced up to 87.8%mortality[95%confidence interval(CI):83.5-92.1%)and 55.6%(95%CI:48.5-62.7%)after 20 washes whilst unwashed pyrethroid-only net(Royal Sentry)killed just 18.2%(95%CI:13.4-22.9%)of *** unwashed Permanet 3.0 killed up to 53.8%(95%CI:44.3-63.4%)of field-resistant mosquitoes and 47.2%(95%CI:37.7-56.7%)when washed 20 times,and the Royal guard 13.2%(95%CI:9.0-17.3%)for unwashed net and 8.5%(95%CI:5.7-11.4%)for t

关键词： Malaria Anopheles Insecticide resistance Dual active ingredient nets interceptor g2

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