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IMPREGNATED NETS OR DDT RESIDUAL SPRAYING? FIELD EFFECTIVENESS OF MALARIA PREVENTION TECHNIQUES IN SOLOMON ISLANDS, 1993–1999

MEAD OVERDevelopment Research Group, World Bank, Washington, District of Columbia; Ministry of Health and Medical Services, Honiara, Solomon Islands; World Health Organization, Honiara, Solomon Islands; Department of Preventive Medicine and Biometrics, University of Colorado Health Sciences Center, Denver, Colorado

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BERNARD BAKOTE’EDevelopment Research Group, World Bank, Washington, District of Columbia; Ministry of Health and Medical Services, Honiara, Solomon Islands; World Health Organization, Honiara, Solomon Islands; Department of Preventive Medicine and Biometrics, University of Colorado Health Sciences Center, Denver, Colorado

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RAMAN VELAYUDHANDevelopment Research Group, World Bank, Washington, District of Columbia; Ministry of Health and Medical Services, Honiara, Solomon Islands; World Health Organization, Honiara, Solomon Islands; Department of Preventive Medicine and Biometrics, University of Colorado Health Sciences Center, Denver, Colorado

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PETER WILIKAIDevelopment Research Group, World Bank, Washington, District of Columbia; Ministry of Health and Medical Services, Honiara, Solomon Islands; World Health Organization, Honiara, Solomon Islands; Department of Preventive Medicine and Biometrics, University of Colorado Health Sciences Center, Denver, Colorado

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PATRICIA M. GRAVESDevelopment Research Group, World Bank, Washington, District of Columbia; Ministry of Health and Medical Services, Honiara, Solomon Islands; World Health Organization, Honiara, Solomon Islands; Department of Preventive Medicine and Biometrics, University of Colorado Health Sciences Center, Denver, Colorado

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The incidence of malaria in Solomon Islands has been decreasing since 1992. The control program used a combination of methods including DDT residual house spraying and insecticide-treated mosquito nets. To determine how much each method contributed to malaria control, data were analyzed on monthly incidence and on control activities for 41 of 110 malaria zones over the same time period (January 1993 to August 1999). After correction for endogeneity, then spraying, insecticide treatment of nets, and education about malaria are all independently associated with reduction in incident cases of malaria or fever, while larviciding with temephos is not. The evidence suggests that although impregnated bed nets cannot entirely replace DDT spraying without substantial increase in incidence, their use permits reduced DDT spraying. The paper shows that non-experimental data can be used to infer causal links in epidemiology, provided that instrumental variables are available to correct for endogeneity.

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