Anopheles darlingi and Anopheles marajoara (Diptera: Culicidae) susceptibility to pyrethroids in an endemic area of the Brazilian Amazon

Abstract

Introduction: This study aimed to evaluate the susceptibility of Anopheles darlingi Root (1926) and Anopheles marajoara Galvão & Damasceno (1942) to pyrethroids used by the National Malaria Control Program in Brazil. Methods: Mosquitoes from Amapá, Brazilian Amazon, were assessed for resistance to cypermethrin, deltamethrin, and alpha-cypermethrin. Insecticideimpregnated bottles were used as suggested by the CDC/Atlanta. Results: Diagnostic dose for Anopheles darlingi was 12.5μg/ bottle during 30 min of exposure. Concentrations for Anopheles marajoara were 20μg/bottle of cypermethrin and deltamethrin and 12.5μg/bottle of alpha-cypermethrin. Conclusions: No resistance was recorded for Anopheles darlingi, but Anopheles marajoara requires attention.