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The effect of permethrin impregnated bednets on the incidence of Plasmodium falciparum, in children of north Guadalcanal, Solomon Islands.

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Ministry of Health and Medical Service, Solomon Islands Medical Training and Research Center.


The effect of permethrin impregnated bednets was studied for the first time amongst a large community in North Guadalcanal, Solomon Islands. The community was divided into two; one covered 23 villages with 860 people who were given bednets impregnated at 0.5 g/m2, and the other 20 villages with 520 people was used as control. Parasitological data were collected by regular prevalence surveys and examination of records of malaria patients who have sought treatment in clinics. Entomological data by landing catches using human bait. The entomological results showed a 71% reduction of Anopheles farauti. Even though there was no significant reduction observed with An.punctulatus, as the density was already very low, the number biting indoor was much lower than those outdoor of houses with treated bednets. Parasitologically there was a steady decline in the incidence between surveys with Plasmodium falciparum in the under 10 years old. Even though there was no significant reduction in the other variables measured, there was a steady increase in the clearance rate between surveys which might also be due to easy accessibility to chemotherapy. The study showed the significant beneficial effect of permethrin impregnated bednets, which was found to be still effective up to twelve months, against stable P. falciparum malaria in children.

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