Effect of community‐wide use of insecticide‐treated nets for 3–4 years on malarial morbidity in Tanzania

摘要: OBJECTIVES To investigate (1) benefits due to personal protection of individual net users vs. mass killing mosquitoes within villages as a result widespread usage; (2) sustainability over several years against malarial morbidity insecticide-treated nets; (3) distribution the in different age groups children and (4) whether, fading immunity, older 'paid for' which they had enjoyed when younger. METHODS Tabulation earlier data compare community-wide effects mosquito vectors; two cross-sectional surveys for malaria parasitaemia, fever, anaemia splenomegaly eight Tanzanian villages, there been use bednets annually re-treated with alphacypermethrin 3-4 years; comparison between intact, torn or no nets these 4-6 without nets. RESULTS A 90-95% reduction infective bites outside netted an additional 54-82% among users. Highly significant reductions (by 55-75%) aged 6 months 2 were found with, some outcomes, better results individuals who themselves intact treated For children, less clear absent, but was sign that early life by worse outcomes later childhood. CONCLUSIONS The overall community are sustainable not reversed immunity. It is important ensure high enough coverage realize full potential method. By showing impact on vector population provide strong argument organized free provision treatment, rather than relying marketing.