[Assessing the Effectiveness of Impregnated Mosquito Nets, 36 Months after Their Distribution in the South of Cameroon].

Autor:	Nopowo FN; Laboratoire de biologie et physiologie des organismes animaux, département de biologie et organismes animaux, faculté des sciences, université de Douala, BP 24157 Douala, Cameroun., Offono Enama L; Laboratoire de biologie et physiologie des organismes animaux, département de biologie et organismes animaux, faculté des sciences, université de Douala, BP 24157 Douala, Cameroun., Tsila HG; Unité de recherche en biologie et écologie appliquées, département de biologie animale, faculté des sciences, université de Dschang, BP 67 Dschang, Cameroun., Mbida Mbida A; Laboratoire de biologie et physiologie des organismes animaux, département de biologie et organismes animaux, faculté des sciences, université de Douala, BP 24157 Douala, Cameroun., Tonga C; Laboratoire de biologie et physiologie des organismes animaux, département de biologie et organismes animaux, faculté des sciences, université de Douala, BP 24157 Douala, Cameroun., Ngo Hondt E; Laboratoire de biologie et physiologie des organismes animaux, département de biologie et organismes animaux, faculté des sciences, université de Douala, BP 24157 Douala, Cameroun., Mbongue R; Laboratoire de biologie et physiologie des organismes animaux, département de biologie et organismes animaux, faculté des sciences, université de Douala, BP 24157 Douala, Cameroun., Kekeunou S; Laboratoire de zoologie, département de biologie et physiologie animale, faculté des sciences, université de Yaoundé-I, BP 812 Yaoundé, Cameroun., Mekoulou Ndongo J; Laboratoire de biologie et physiologie des organismes animaux, département de biologie et organismes animaux, faculté des sciences, université de Douala, BP 24157 Douala, Cameroun., Akono PN; Laboratoire de biologie et physiologie des organismes animaux, département de biologie et organismes animaux, faculté des sciences, université de Douala, BP 24157 Douala, Cameroun.
Jazyk:	francouzština
Zdroj:	Bulletin de la Societe de pathologie exotique (1990) [Bull Soc Pathol Exot] 2020; Vol. 113 (3), pp. 289-297.
DOI:	10.3166/bspe-2021-0159
Abstrakt:	Mosquito control in Cameroon relies largely on the proper use of Long-Lasting Insecticidal Nets (LLINs). It is necessary to monitor their effectiveness in order to propose corrective measures to improve the strategy. The aim of this work was to determine the physical integrity and effectiveness of LLINs (Interceptor brand) on Anopheles gambiae s.l. populations in two urban and rural areas of the Ayos health district. The level of LLIN coverage and use was assessed through a population survey. The physical integrity of LLINs was assessed by measuring the holes according to the WHO method. Bio-efficacy testing of ITNs was carried out according to the cone test protocol using 2-5-day-old, non-blood fed Anopheles gambiae s.l. females from the natural field strain and the reference susceptible strain. Household LLIN coverage rates in urban and rural areas were 55.50% and 66.94%, respectively. On the other hand, the rates of use were 78.01% and 75.22% in urban and rural areas respectively. The proportion of nets that had lost their physical integrity after 36 months of use was 47.00% and 59.63% in urban and rural areas respectively. The size of holes ranged from 0.5 to 25 cm. Alphacypermethrin was found to be ineffective against both strains of Anopheles gambiae s.l. tested. Knockdown rates ranged from 8.5% to 73% for the reference susceptible strain and less than 2.5% for the natural field strain. Mortality rates for the natural strain of Anopheles gambiae s.l. ranged from 0% to 2.5% while they were between 29% and 70% for the susceptible strain. The results show a decrease in the effectiveness of LLINs against the mosquitoes tested. This may be due to the lower than expected WHO possession and use rates of LLINs, their relatively high degree of wear and tear, and the resistance of the vectors to alphacypermethrin. Competing Interests: The authors have no conflicts of interest to declare
Databáze:	MEDLINE
Externí odkaz:	Zobrazit plný text záznamu