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PROTECTIVE EFFICACY OF LAMBDA-CYHALOTHRIN TREATED NETS IN ANOPHELES GAMBIAE PYRETHROID RESISTANCE AREAS OF CÔTE D’IVOIRE

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  • 1 Institut Pierre Richet, Bouaké, Côte d’Ivoire; Institut de Médecine Tropicale du Service de Santé des Armées, Marseille, France; Parasitic Diseases and Vector Control, Control, Prevention and Eradication, WHO, Geneva, Switzerland

The efficacy of nets treated with lambda-cyhalothrin, a pyrethroid insecticide, on malaria infection and disease was assessed for the first time at the community level in Anopheles gambiae pyrethroid resistance areas. The study was carried out in northern Côte d’Ivoire, which is an area of kdr resistance. Four pairs of villages were selected and matched according to demographic, sociological, and ecological criteria. Among each pair, a village was randomly allocated to receive mosquito nets. More than 80% of beds were covered with nets treated with lambda-cyhalothrin and retreated after 6 months. In each village, 54 children aged 0–59 months were randomly selected and clinically monitored for 8 periods of 7 days throughout the year. Results showed that the efficacy of treated nets was maintained with a reduction of the prevalence of asymptomatic malaria infection by 12% and an estimated protective efficacy against malaria disease of 56%.

Author Notes

Reprint requests: Marie-Claire Henry, Centre Muraz, 01 BP 390 Bobo-Dioulasso 01, Burkina Faso, Telephone: +226 20 97 29 44, Fax: + 226 20 98 15 51, E-mail: depauw.henry@fasonet.bf.
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