Abstract
Dengue and yellow fever are prevalent in Côte d’Ivoire and Aedes (Stegomyia) aegypti(Linnaeus), (Diptera: Culicidae), is known as the main vector. We aimed to assess sea-sonal variation and spatial heterogeneity in the transmission of both arbovirus diseasesin Abidjan. Entomological surveys targeting larvae of A. aegypti, were carried outbetween November 2015 and August 2016 covering the four climatic seasons includinga cohort of 100 houses randomly selected in three neighbourhoods. A. aegypti was thepredominant species (96.6%) of mosquitoes resulting from the rearing of harvested lar-vae, and the only vector of dengue and yellow fever recorded during the study period.The highest proportion of water storage containers (45.5%) which represented the majorbreeding sites infested by the larvae of A. aegypti, was observed in Anoumabo. Thehouse indices >5% and/or Breteau indices >20 recorded in each neighbourhood, duringthe different climatic seasons, indicated that there was, a high and permanent, heteroge-neity in the transmission risk of dengue and yellow fever between the threeneighbourhoods. In terms of transmission risk, Anoumabo was the neighbourhood withthe highest risk compared to the two others, then, particular attention should be paid tothis site in terms of surveillance by vector control programme in Abidjan.