Investigation entomologique à la suite de la réémergence de la fièvre jaune en 2008 à Abidjan (Côte d’Ivoire)

Abstract

In April 2008, Abidjan was again faced with another case of yellow fever after the epidemic of 2001 causing mass immunization campaign. In order to evaluate the extent of amaril virus circulation and the risk for local people, an entomological investigation was carried out by the Ministry of Health and Public Hygiene of Côte d'Ivoire. At "Entent" area of Treichville, Breteau index was estimated at 34, recipient index at 20 % and house index at 25 %. Those indexes were respectively 53, 21 and 31 % at "Vridi canal" of Port Bouet. In the both neighborhood, Aedes aegypti accounted for more than 80 % of mosquitoes caught and more than 90 % of mosquitoes adults obtained from larval breeding. This new situation of epidemic risk could be explained by several factors including the reception of 70 % of forced migration people caused by the crisis in the country occurred in 2002, the probable drop of preventive immunization, the environment deterioration creating of more breeding sites of Ae. aegypti. Résumé

Expansion ofAedes africanus(Diptera: Culicidae), a sylvatic vector of arboviruses, into an urban environment of Abidjan, Côte d'Ivoire

“…In addition to these two vectors, the NPB contains a diversity of Aedes vectors. Notification of these wildlife species in this forest may also confirm that this site represents a likely endemic emergence area reported by Konan et al ().…”

“…Imported cases from Côte d'Ivoire were reported in France (six cases) and Japan (one case) (La Ruche et al , Moi et al , Aoussi et al ). A resurgence of yellow fever cases was also noticed in the northern part of the country in 2009 (Attoh‐Touré et al ) and in the district of Abidjan, the economic capital, consecutively, in 2008, 2009, 2010 and 2011 (Konan et al ). Even if active cases of Zika virus were not yet reported, people who had already contracted the virus in the past had been identified (Akoua‐Koffi et al ).…”

Aedes aegypti Susceptibility to Insecticide from Abidjan City, Cote D'ivoire

“…The report mentions 12 cases between January 1, 2006, and August 31, 2008, 1 in 2006, 3 in 2007, and 8 in 2008. Effectively in 2008 there were two simultaneous outbreaks of yellow fever and dengue 3 in Abidjan (InVS 2008, Konan et al 2009, WHO 2009. Facing this situation, the Ministry of Health decided to strengthen its warning system and an entomological surveillance of potential arbovirus vectors were initiated in some specific areas of Abidjan.…”

Species composition and population dynamics ofAedesmosquitoes, potential vectors of arboviruses, at the container terminal of the autonomous port of Abidjan, Côte d’Ivoire

“…In the 2001 yellow fever outbreak, 16 out of the 73 suspected cases were laboratory-confirmed with one fatal case [1]. Seven years later, another yellow fever outbreak occurred with 15 cases confirmed by the Pasteur Institute of Côte d’Ivoire; the first five of these were counter-confirmed by the regional reference laboratory of the Pasteur Institute of Dakar [17, 21]. Almost at the same period, an epidemic of Middle Eastern type 3 dengue was detected following an international alert launched after a positive diagnosis of dengue among two tourists returning from Côte d’Ivoire [21].…”