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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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Anopheles leesoniEvans 1931, a Member of the Anopheles funestusGroup, Is a Potential Malaria Vector in Cameroon

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Advances in Entomology 2022年第1期10卷 99-109页

作者： Edmond Kopya Cyrille Ndo Landre Djamouko-Djonkam Leslie Nkahe Parfait Awono-Ambene flobert njiokou Charles Sinclair Wondji Christophe Antonio-Nkondjio Malaria ResearchLaboratory Organisation de Coordination pour la lutte Contre les Endémies en Afrique Centrale (OCEAC) Yaoundé Cameroun Faculty of Sciences University of Yaoundé I Yaoundé Cameroon Faculty of Medicine and Pharmaceutical Sciences University of Douala Douala Cameroon Centre for Research in Infectious Diseases Yaoundé Cameroon Department of Vector Biology Liverpool School of Tropical medicine Liverpool L3 5QA UK Vector Borne Infectious Disease Unit of the Laboratory of Applied Biology and Ecology (VBID-LABEA) Department of Animal Biology Faculty of Science University of Dschang Dschang Cameroon

Background: Understanding the biology of Anopheles malaria vector species is essential to planning effective and sustainable malaria control strategies in endemic countries. This study reported the implication of Anopheles leesoni in malaria transmission in Cameroon, Central Africa. Methods: Mosquitoes were collected in three localities from May 2015 to March 2018 using electric aspirators and Centers for Disease Control light traps (CDC-LT). Anopheles funestus sensu lato (s.l.) mosquitoes were identified as species using polymerase chain reaction assay (PCR). Furthermore, Plasmodium falciparum infection status was determined using the enzyme-linked immunosorbent assay (ELISA) method. Results: A total of 12,744 Anopheles mosquitoes were collected by electric aspirator (N = 4844) and CDC-LT (N = 7900).

关键词： Anopheles funestus Group Anopheles leesoni Plasmodium falciparum Malaria Transmission Cameroon

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First detection of F1534C knockdown resistance mutation in Aedes aegypti(Diptera:Culicidae)from Cameroon

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Infectious Diseases of Poverty 2020年第6期9卷 51-62页

作者： Aurelie P.Yougang Basile Kamgang Theodel A.Wilson Bahun Armel N.Tedjou Daniel Nguiffo-Nguete flobert njiokou Charles S.Wondji Centre for Research in Infectious Diseases P.O.Box 13591YaoundéCameroon Parasitology and Ecology Laboratory Department of Animal Biology and PhysiologyFaculty of ScienceUniversity of Yaoundé1P.O.Box 812YaoundéCameroon Laboratory of Vertebrate and Invertebrate Bioecology Faculty of Science and TechnologyMarien-Ngouabi UniversityBrazzavilleCongo Laboratory of Biology and Applied Ecology Department of Animal BiologyFaculty of ScienceUniversity of DschangP.O.Box 96DschangCameroon Liverpool School of Tropical Medicine Pembroke placeLiverpoolL35QAUK

Background: Aedes borne viral diseases,notably dengue,are increasingly reported in Cameroon with Aedes aegypti being a major *** on insecticide resistance of this vector and underlying mechanisms needed for outbreak preparedness remain scarce in ***,we present the nationwide distribution of insecticide resistance in *** and investigate the potential resistance mechanisms ***:: Immature stages of *** were collected between March and July 2017 in 13 locations across Cameroon and reared until G1/G2/G3 ***,adult bioassays,and piperonyl butoxide(PBO)synergist assays were carried out according to World Health Organization guidelines.F1534C mutation was genotyped using allele specific polymerase chain reaction in field collected adults(Go)and the polymorphism of the sodium channel gene was ***χ2 test was used to compare the mortality rate between bioassays with insecticides only and bioassays after preexposure to PBO ***: Larval bioassay revealed that all the three populations tested with temephos were *** bioassays showed a good level of susceptibility toward both pyrethroids tested,0.25%permethrin and 0.05%deltamethrin,with six out of 10 populations ***,two populations(Douala and Edéa)were resistant(deltamethrin[73.2–92.5%mortality],permethrin[2.6–76.3%mortality]).The resistance to 4%dichlorodiphenyltrichloroethane was observed in four out of 10 populations tested(16.8–87.1%mortality).Resistance was also reported to carbamates including 0.1%propoxur(60.8–87.1%mortality)and to 0.1%bendiocarb(82.9%mortality).All populations tested were fully susceptible to 1%fenitrothion.A partial recovery of susceptibility was observed in the pyrethroid resistant population of Douala after pre-exposed to PBO suggesting the implication of cytochrome P450 monoxygenases permethrin *** and sequencing detected the F1534C kdr mutation in the two pyrethroid resistant

关键词： Aedes aegypti Insecticide resistance Kdr mutation Cameroon Arbovirus

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Efficacy of the Microbial Larvicide VectoMax®G against Anopheles gambiaes.l. and Culexspp. Larvae under Laboratory and Open Field Trial Experiments in the City of Yaoundé, Cameroon

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Advances in Entomology 2022年第1期10卷 34-51页

作者： Kopya Edmond Foko Dadji Gisele Aurelie Sonhafouo-Chiana Nadège Bamou Roland Djamouko-Djonkam Landre Talipouo Abdou Delogko Serges njiokou flobert Awono-Ambene Parfait Wondji Charles Sinclair Antonio-Nkondjio Christophe Faculty of Sciences University of Yaoundé I Yaoundé Cameroon Laboratoire de Recherche sur le Paludisme Organisation de Coordination pour la lutte Contre les Endémies en Afrique Centrale (OCEAC) Yaoundé Cameroun High Teacher School University of Yaoundé I Yaoundé Cameroon Faculty of Sciences University of Buea Buea Cameroon Vector Borne Diseases Laboratory of the Biology and Applied Ecology Research Unit (VBID-URBEA) Department of Animal Biology Faculty of Science of the University of Dschang Dschang Cameroon Centre for Research in Infectious Diseases Yaoundé Cameroon Vector Group Liverpool School of Tropical medicine Pembroke Place Liverpool UK

Background: With the rapid expansion of insecticide resistance limiting the effectiveness of insecticide-based vector control interventions, integrated control strategies associating larviciding could be appropriate to improve current control efforts. The present experimental study assesses laboratory and field efficacy of the larvicide VectoMax®G on Anopheline and Culicine larval stages in Yaoundé. Methods: The effect of the larvicide VectoMax®G, a combination of Bacillus thuringiensis var. israelensis (Bti) and Bacillus sphaericus (Bs), on larval development was assessed during both laboratory and open field trial experiments. Laboratory experiments permitted the evaluation of five different concentrations with four replicates/experiments. Laboratory experiments were conducted with Anopheles coluzzii “Ngousso” and Culex quinquefasciatus laboratory strains. Open field trials were conducted using sixteen plastic containers with a diameter of 0.31 m buried in an array of four rows with 4 containe

关键词： VectoMax®G Bacillus thuringiensis var. israelensis Bacillus sphaericus Anopheles gambiae s.l. Culex Mosquitoes Yaoundé Camreroon

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