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STRONG ASSOCIATION BETWEEN HOUSE CHARACTERISTICS AND MALARIA VECTORS IN SRI LANKA

FLEMMING KONRADSENDepartment of International Health, University of Copenhagen, Copenhagen, Denmark; International Water Management Institute, Colombo, Sri Lanka; Department of Zoology, Faculty of Science, University of Peradeniya, Sri Lanka; Anti-Malaria Campaign, Anuradhapura, Sri Lanka

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PRIYANIE AMERASINGHEDepartment of International Health, University of Copenhagen, Copenhagen, Denmark; International Water Management Institute, Colombo, Sri Lanka; Department of Zoology, Faculty of Science, University of Peradeniya, Sri Lanka; Anti-Malaria Campaign, Anuradhapura, Sri Lanka

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WIM VAN DER HOEKDepartment of International Health, University of Copenhagen, Copenhagen, Denmark; International Water Management Institute, Colombo, Sri Lanka; Department of Zoology, Faculty of Science, University of Peradeniya, Sri Lanka; Anti-Malaria Campaign, Anuradhapura, Sri Lanka

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FELIX AMERASINGHEDepartment of International Health, University of Copenhagen, Copenhagen, Denmark; International Water Management Institute, Colombo, Sri Lanka; Department of Zoology, Faculty of Science, University of Peradeniya, Sri Lanka; Anti-Malaria Campaign, Anuradhapura, Sri Lanka

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DEVIKA PERERADepartment of International Health, University of Copenhagen, Copenhagen, Denmark; International Water Management Institute, Colombo, Sri Lanka; Department of Zoology, Faculty of Science, University of Peradeniya, Sri Lanka; Anti-Malaria Campaign, Anuradhapura, Sri Lanka

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MALDENIYA PIYARATNEDepartment of International Health, University of Copenhagen, Copenhagen, Denmark; International Water Management Institute, Colombo, Sri Lanka; Department of Zoology, Faculty of Science, University of Peradeniya, Sri Lanka; Anti-Malaria Campaign, Anuradhapura, Sri Lanka

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The objective of this study was to determine whether house characteristics could be used to further refine the residual insecticide-spraying program in Sri Lanka. Indoor-resting mosquito densities were estimated in 473 houses based on fortnightly collections over a two-and-a-half-year period. The type of house construction and the exact location of all houses were determined. In a multivariate analysis, distance of less than 750 meters between a house and the main vector-breeding site was strongly associated with the presence of Anopheles culicifacies in the house (odds ratio [OR] 4.8, 95% confidence interval [CI] 3.4–6.8) and to a lesser extent with the presence of An. subpictus (OR 1.4, 95% CI 1.1–1.7). Poor housing construction also was an independent risk factor (OR for An. culicifacies 1.3, 95% CI 1.0–1.9; OR for An. subpictus 1.3, 95% CI 1.0–1.6). It is recommended that a malaria control strategy focus on residential areas within 750 meters of streams and rivers, with special attention given to areas with the poorest type of house construction.

Author Notes

Reprint requests: Wim van der Hoek, Bierstalpad 37, 1121 JK Landsmeer, Netherlands, Telephone: +31-20-4826312, Fax: +94-1-786854, E-mail: w.van-der-hoek@cgiar.org
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