Three trials with torn bed nets impregnated with permethrin and deltamethrin were made under field conditions at the Soumousso Field Station and the Vallée du Kou rice-field area, both in Burkina Faso, and the Djoumouna fish pond area in the Congo Republic. Even a considerably torn correctly impregnated bed net could be an useful method for limiting human-anopheline contacts. But bed nets in poor condition, i.e. too little impregnated and too much torn, cannot protect the users against anopheline bites. Protection increases with insecticide concentration, but at a high dosage insecticide could have more a repellent than a killing effect. Therefore a balance has to be found for the optimum rate of insecticide treatment of bed nets to obtain a real reduction in malaria transmission and morbidity, in every epidemiological situation.
En dépit des méthodes de lutte développées contre le paludisme, l'apparition de la résistance d'Anopheles gambiae s.l. aux insecticides constitue une menace susceptible de conduire à l'échec de la lutte contre cette pathologie. Une étude récapitulative a été réalisée afin de montrer la dynamique spatio-temporelle de la résistance d'Anopheles gambiae s.l. à quelques insecticides utilisés au Congo de 2002 à 2018. Les tests de sensibilité ont été réalisés avec des femelles adultes âgées de un à cinq jours. Les insecticides testés appartiennent à 4 familles : (1) organochlorés : DDT 4%;
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