Entomological evaluation of the risk of spread of the dengue 3 epidemic in the health district of Cocody (Abidjan, Côte d’Ivoire)

Abstract

As directed by the Ministry of Health and Public Hygiene, this study aims to assess the extent of the viral circulation of dengue 3 in the health district of Cocody-Bingerville and the risk that this represents for the populations. To do this, adult anthropophilic mosquitoes were captured by the double mosquito net technique and a larval prospecting around the dengue case was performed. Mosquito samples were made for viral research. A total of 64 mosquitoes were captured and Aedes aegypti constituted approximately 97% (62/64) of the culicidian fauna. Thus, 7 samples were formed, including 6 with Aedes aegypti. In addition, Aedes aegypti constituted 93% (200/216) of emergences in the laboratory. At the emergence level, 21 samples were formed, including 20 with Aedes aegypti. Among these different samples, 2 from the catches and 1 from the emergences, were positive for the dengue virus. In Cocody, the Breteau index was estimated at 297, the container index at 41%, and the house index at 82%. While in the municipality of Bingerville, these indices were respectively 213, 35% and 69%. Stegomyian index showed that larval densities were very high in both communes, reflecting a high risk of spreading dengue viruses.