Case-control study of mosquito nets against malaria in the Amazon region of Colombia.

Alexander, N; Rodriguez, M; Perez, L; Caicedo, JC; Cruz, J; Prieto, G; Arroyo, JA; Cotacio, MC; Suarez, M; DE LA Hoz, F; Hall, AJ; (2005) Case-control study of mosquito nets against malaria in the Amazon region of Colombia. The American journal of tropical medicine and hygiene, 73 (1). pp. 140-8. ISSN 0002-9637

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The degree of effectiveness of mosquito nets against malaria in the Americas has remained uncertain. We carried out a case-control study of net use and mild malaria in the Amazonas state of Colombia. Two hundred ninety cases were enrolled via the Health Department services, and 977 community-based controls matched for age, sex, and place of residence. We found that a large proportion of the population (96% of controls) slept under nets. Nevertheless, we found a benefit of impregnated nets compared with no net use: adjusted odds ratio (OR) for mild malaria 0.44, 95% confidence interval (CI) 0.20-0.98. Nonimpregnated nets had a benefit that was only slightly smaller but not statistically significant (OR for mild malaria 0.54, 95% CI 0.25-1.18). Travel in the previous month had an odds ratio of 6.2 (95% CI 3.1-8.8) and a population attributable fraction of 13% compared with 11% for failure to use an impregnated net. We conclude that, in the Amazon region, promotion of mosquito net use and impregnation is justified, and that there is a need for measures to protect travelers from malaria.

Item Type: Article
Faculty and Department: Faculty of Epidemiology and Population Health > Dept of Infectious Disease Epidemiology
Research Centre: Tropical Epidemiology Group
PubMed ID: 16014849
Web of Science ID: 230451900028


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