Seasonal variation and intra urban heterogeneity of the entomological risk of transmission of dengue and yellow fever in Abidjan, Côte d'Ivoire

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 seasonal variation and spatial heterogeneity in the transmission of both arbovirus diseases in Abidjan. Entomological surveys targeting larvae of A. aegypti, were carried out between November 2015 and August 2016 covering the four climatic seasons including a cohort of 100 houses randomly selected in three neighbourhoods. A. aegypti was the predominant species (96.6%) of mosquitoes resulting from the rearing of harvested larvae, 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 major breeding sites infested by the larvae of A. aegypti, was observed in Anoumabo. The house indices >5% and/or Breteau indices >20 recorded in each neighbourhood, during the different climatic seasons, indicated that there was, a high and permanent, heterogeneity in the transmission risk of dengue and yellow fever between the three neighbourhoods. In terms of transmission risk, Anoumabo was the neighbourhood with the highest risk compared to the two others, then, particular attention should be paid to this site in terms of surveillance by vector control programme in Abidjan.

Dengue 1 outbreak in Rosso, northern Senegal, October 2021: entomologic investigations

“…A. aegypti , currently the only known vector of dengue in urban areas of Senegal, was the only Aedes species collected in this study. This species immature stages frequently were collected in water storage containers that are known to be suitable larval habitats in domestic environments (Koenraadt and Harrington 2008, Guindo-Coulibaly et al 2022). Indeed, the long-term storage of drinking water or water for domestic use from these containers that are constantly filled and poorly sealed accounted for their high infestation rate compared to other domestic aquatic sites (Konan et al 2013).…”

Comparación clínica y laboratorial de la fiebre amarilla severa versus dengue grave en Perú

“…Las dos patologías presentaron tiempo de enfermedad corto (5 en fiebre amarilla severa y 7 días en dengue grave) y esto concuerda con otros estudios realizados (Gehrke et al, 2021;Guindo et al, 2022). Dentro de las características clínicas encontramos que la bradicardia relativa (signo de Faget) fue hallada en los pacientes con fiebre amarilla severa (p<0,01), signo inespecífico pero muy importante para ser considerado en casos de fiebre amarilla severa (Wakimoto et al,2017;Aliaga et al, 2022).…”