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Bioefficacy and durability of olyset?Plus, a permethrin and piperonyl butoxide-treated insecticidal net in a 3-year long trial in Kenya

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贫困所致传染病(英文) 2021年第6期 16-26页

作者： Gichuki Paul M. Kamau Luna Njagi Kiambo Karoki Solomon Muigai Njoroge Matoke-Muhia Damaris Bayoh Nabie Mathenge Evan Yadav Rajpal S. Eastern & Southern Africa Centre of International Parasite Control Kenya Medical Research Institute Nairobi Kenya Centre for Biotechnology Research and Development Division of National Malaria Programme Ministry of Health Department of Health Kirinyaga County Kirinyaga Centre for Global Health Research Kisumu Department of Control of Neglected Tropical Diseases World Health Organization Geneva Switzerland

Background: Long-lasting insecticide nets (LLINs) are a core malaria intervention. LLINs should retain efficacy against mosquito vectors for a minimum of three years. Efficacy and durability of olyset? Plus, a permethrin and piperonyl butoxide (PBO) treated LLIN, was evaluated versus permethrin treated olyset? net. In the absence of WHO guidelines of how to evaluate PBO nets, and considering the manufacturer’s product claim, olyset? Plus was evaluated as a pyrethroid ***: This was a household randomized controlled trial in a malaria endemic rice cultivation zone of Kirinyaga County, Kenya between 2014 and 2017. Cone bioassays and tunnel tests were done againstAnopheles gambiae Kisumu. The chemical content, fabric integrity and LLIN survivorship were monitored. Comparisons between nets were tested for significance using the Chi-square test. Exact binomial distribution with 95% confidence intervals (95% CI) was used for percentages. The WHO efficacy criteria used were ≥ 95% knockdown and/or ≥ 80% mortality rate in cone bioassays and ≥ 80% mortality and/or ≥ 90% blood-feeding inhibition in tunnel ***: At 36 months, olyset? Plus lost 52% permethrin and 87% PBO content; olyset? net lost 24% permethrin. Over 80% of olyset? Plus and olyset? net passed the WHO efficacy criteria for LLINs up to 18 and 12 months, respectively. At month 36, 91.2% olyset? Plus and 86.4% olyset? net survived, while 72% and 63% developed at least one hole. The proportionate Hole Index (pHI) values representing nets in good, serviceable and torn condition were 49.6%, 27.1% and 23.2%, respectively for olyset? Plus, and 44.9%, 32.8% and 22.2%, respectively for olyset? net but were not significantly ***: olyset? Plus retained efficacy above or close to the WHO efficacy criteria for about 2 years than olyset? net (1-1.5 years). Both nets did not meet the 3-year WHO efficacy criteria, and showed little attrition, comparable physical durability and survivorship, with

关键词： Anopheles gambiae Bioefficacy Durability Kenya Long-lasting insecticidal net olyset? net olyset? Plus Permethrin Piperonyl butoxide

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