Efficacy of insecticides used in indoor residual spraying for malaria control: an experimental trial on various surfaces in a "test house"

• Published in: Malaria journal 2019-10, Vol.18 (1), p.345-14, Article 345
• Main Authors: Corrêa, Ana Paula S A, Galardo, Allan K R, Lima, Luana A, Câmara, Daniel C P, Müller, Josiane N, Barroso, Jéssica Fernanda S, Lapouble, Oscar M M, Rodovalho, Cynara M, Ribeiro, Kaio Augusto N, Lima, José Bento P
• Format: Article
• Language: English
• Subjects: Animals; Anopheles; Brazil; Carbamates; Care and treatment; Control; Decision making; Disease transmission; Housing; Indoor residual spraying; Insecticides; Integrated vector management; Malaria; Malaria - prevention & control; Methods; Mortality; Mosquito Control; Mosquito Vectors; Powders (Particulate matter); Public health; Wall surface type
• ISSN: 1475-2875; 1475-2875
• DOI: 10.1186/s12936-019-2969-6

Malaria is a public health problem in the Brazilian Amazon region. In integrated vector management for malaria (anopheline) control, indoor residual spraying (IRS) represents one of the main tools in the basic strategy applied in the Amazonian states. It is essential to understand the residual efficacy of insecticides on different surfaces to determine spray cycles, ensure their rational use, and prevent wastage. This study aimed to evaluate the residual efficacy of six insecticide formulations used in the National Malaria Control Programme on four different types of walls in a field simulation at a "test house". The tests were performed as a field-simulating evaluation at a "test house" built in the municipality of Macapá. Six insecticide formulations comprising four pyrethroids, a carbamate, and an organophosphate were used, and evaluated when applied on different wall surfaces: painted wood, unpainted wood, plastered cement, and unplastered cement. The insecticides were applied to the interior walls of the "test house" by a trained technician. In the bioassays performed with pyrethroids, deltamethrin water-dispersible granules (WG) performed particularly well, presenting residual bioefficacy of 8 months on both wood surfaces after the IRS, whereas alpha-cypermethrin suspension concentrate (SC) and etofenprox wettable powder (WP) demonstrated residual bioefficacy of 4 months on at least one of the wood surfaces; however, the pyrethroid lambda-cyhalothrin WP showed a low residual bioefficacy (