Reduction in Infection with Plasmodium Falciparum One Year after the Introduction of Malaria Control Interventions on Bioko Island, Equatorial Guinea

Reduction in Infection with Plasmodium Falciparum One Year after the Introduction of Malaria Control Interventions on Bioko Island, Equatorial Guinea

Immo Kleinschmidt et al. June 1, 2006
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The Bioko Island Malaria Control Project was initiated in 2003 to substantially reduce malaria on the island of Bioko in Equatorial Guinea. The intervention consisted of generalized indoor residual spraying during the first year of the project. Case management and related measures were introduced during the second year. Two large household and parasitemia surveys of children 2 to < 15 years of age were carried out in 2004 and 2005, respectively, to assess the effect of the intervention after the first year. Patient records were collected retrospectively from one district hospital and analyzed for a comparison of pre-intervention and post-intervention periods. Overall mean prevalence of P. falciparum infection reduced from 46% (95% confidence interval [CI] = 40–51%) at baseline in 2004 to 31% (95% CI = 24–40%) in 2005 (P < 0.001). When the 12-month pre-intervention period was compared with the 12-month post-intervention period, there was a modest but statistically significant reduction in the number of malaria cases among hospital patients.

"The Bioko Island Malaria Control Project (BIMCP)...is funded by a consortium led by Marathon Oil Company (Houston, TX) in collaboration with the government of Equatorial Guinea, and implemented by a number of organizations. Bioko has a population of approximately 250,000 inhabitants, of whom more than half live in and around the capital of Malabo. The discovery of offshore oil and gas in the 1990s has led to a rapid transformation of the economy. Malaria is endemic on Bioko, with very high transmission intensities; the predominant malaria vectors on the island are Anopheles gambiae s.s. and An. funestus.

The BIMCP intervention is a two-pronged strategy consisting of vector control through routine indoor residual spraying (IRS) of all domiciliary structures, and an extensive program of case management and intermittent preventive treatment (IPT) for pregnant women. The two arms of the intervention..."

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