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Durability associated efficacy of long-lasting insecticidal nets after five years of household use

DOI: 10.1186/1756-3305-4-156

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Abstract:

Two to three day- old non blood-fed female mosquitoes from an insectary susceptible colony (An. gambiae s.s, this colony was established at TPRI from Kisumu, Kenya in 1992) and wild mosquito populations (An. arabiensis and Culex quinquefasciatus) were used in cone bioassay tests to assess the efficacy of mosquito nets.The knockdown effect was recorded after three minutes of exposure, and mortality was recorded after 24 hours post-exposure. Mortality of An. gambiae s.s from insectary colony was 100% while An. arabiensis and Cx.quinquefasciatus wild populations had reduced mortality. Insecticide content of the new (the bed net of the same brand but never used before) and used PermaNet? 2.0 was determined using High Performance Liquid Chromatography (HPLC).The results of this study suggest that, in order to achieve maximum protection against malaria, public health education focusing on bed net use and maintenance should be incorporated into the mass distribution of nets in communities.Malaria vector-human contact reduction has been shown to have a significant impact in decreasing malaria transmission and disease prevalence [1-4]. However, the use of malaria intervention tools in Africa is affected by culture and the socioeconomic status of malaria endemic communities and these have influenced bed net ownership and utilization [5,6]. At present, malaria endemic countries in Africa are reporting a wider coverage of LLINs with some countries reporting coverage of more than 60% [4,6,7]. The wide coverage is attributed by the willingness of African government and donors to fund the scale up of LLINs distribution.Investment has primarily been for long lasting technology bed nets, including PermaNet? 2.0 which has been evaluated in different setting in malaria endemic regions globally [7-11]. Today, WHOPES has given a full approval to PermaNet? 2.0 to be categorized as long lasting net. The PermaNet? 2.0 nets are made with polyester and coated with deltamethrin, whereas the O

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