FACTORS INFLUENCING THE EFFECTIVENESS OF MALARIA CONTROL IN BIOKO ISLAND, EQUATORIAL GUINEA

IMMO KLEINSCHMIDT London School of Hygiene and Tropical Medicine, Keppel Street, London WC1E 7HT, England; Malaria Research Programme, South African Medical Research Council, Durban, South Africa; Medical Care Development International, Silver Spring, Maryland; Ministry of Health and Social Welfare, Malabo, Equatorial Guinea

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MIGUEL TORREZ London School of Hygiene and Tropical Medicine, Keppel Street, London WC1E 7HT, England; Malaria Research Programme, South African Medical Research Council, Durban, South Africa; Medical Care Development International, Silver Spring, Maryland; Ministry of Health and Social Welfare, Malabo, Equatorial Guinea

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CHRIS SCHWABE London School of Hygiene and Tropical Medicine, Keppel Street, London WC1E 7HT, England; Malaria Research Programme, South African Medical Research Council, Durban, South Africa; Medical Care Development International, Silver Spring, Maryland; Ministry of Health and Social Welfare, Malabo, Equatorial Guinea

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LUIS BENAVENTE London School of Hygiene and Tropical Medicine, Keppel Street, London WC1E 7HT, England; Malaria Research Programme, South African Medical Research Council, Durban, South Africa; Medical Care Development International, Silver Spring, Maryland; Ministry of Health and Social Welfare, Malabo, Equatorial Guinea

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ISHEN SEOCHARAN London School of Hygiene and Tropical Medicine, Keppel Street, London WC1E 7HT, England; Malaria Research Programme, South African Medical Research Council, Durban, South Africa; Medical Care Development International, Silver Spring, Maryland; Ministry of Health and Social Welfare, Malabo, Equatorial Guinea

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DAVID JITUBOH London School of Hygiene and Tropical Medicine, Keppel Street, London WC1E 7HT, England; Malaria Research Programme, South African Medical Research Council, Durban, South Africa; Medical Care Development International, Silver Spring, Maryland; Ministry of Health and Social Welfare, Malabo, Equatorial Guinea

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GLORIA NSENG London School of Hygiene and Tropical Medicine, Keppel Street, London WC1E 7HT, England; Malaria Research Programme, South African Medical Research Council, Durban, South Africa; Medical Care Development International, Silver Spring, Maryland; Ministry of Health and Social Welfare, Malabo, Equatorial Guinea

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BRIAN SHARP London School of Hygiene and Tropical Medicine, Keppel Street, London WC1E 7HT, England; Malaria Research Programme, South African Medical Research Council, Durban, South Africa; Medical Care Development International, Silver Spring, Maryland; Ministry of Health and Social Welfare, Malabo, Equatorial Guinea

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The Bioko Island Malaria Control Project (BIMCP) has carried out intensive interventions since early 2004 to reduce malaria transmission through indoor residual spraying (IRS) and case management. Annual parasite prevalence surveys have been carried out to monitor the effectiveness of the program. Significant overall reductions in prevalence of infection have been observed, with 42% fewer infections occurring in 2006 compared with baseline. Nevertheless, there is evidence of considerable heterogeneity in impact of the intervention. Prevalence of infection was significantly associated with spray status of the child’s house, spray coverage with effective insecticide of the neighborhood of the house, bed net use, and time elapsed since last spray. Careful scheduling of spray coverage is therefore essential to maximize the effectiveness of IRS and to ensure consistent reductions in parasite prevalence. This can only be achieved if comprehensive monitoring systems are in place for both the management and evaluation of the intervention.

Author Notes

Reprint requests: Immo Kleinschmidt, London School of Hygiene and Tropical Medicine, Keppel Street, London WC1E 7HT, United Kingdom, Telephone: +44 20 7612 7872, Fax: +44 20 7636 8739, e-mail: Immo.Kleinschmidt@lshtm.ac.uk.
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    Rajendra M, Casimiro S, Mthembu SD, Sharp BL, 2004. The residual life of bendiocarb: a field-based evaluation from Mozambique. J Med Entomol 41 :130–132.

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