Thème :

Surveillance épidémiologique et prévention des maladies infectieuse

Type de présentation :

Présentation Orale

Titre abstract :

Bio-écologie et distribution des moustiques du genre Culex (Diptera : Culicidae) dans la ville de Yaoundé

Auteurs :

Borel TCHAMEN¹

 

 

Institutions:

¹OCEAC

Corresponding authors :

borel_tchamen@yahoo.com

Référence :

CaHReF 2018, Yaoundé Congres hall, 08 – 11 January 2019 , OSEP026

Abstract :

Background: Nucturnal nuisance and the risk of lymphatic filariasis due to mosquito’s genus Culex is a threat in urban areas. Yaoundé city favours the development of these mosquitoes because of it low lands and where anarchic habitat are built.

Objectif: Assess the bio-ecology of Culex species in Yaoundé particularly their geographic distribution and the physico-chemicals parameters that influence it density and their susceptibilities to insecticides

Methodolody: Surveys were conducted in eight (08) districts of Yaoundé city from May to December 2017.During each survey, physicals characterizations of breeding sites and mosquito’s larvae collection were undertaken using the "dipping" method. Emerged female from larvae collected were exposed to Permethrin (0.75%) and Deltamethrin (0.05%) according to WHO insecticide susceptibility test guidelines. Futhermore adult mosquitoes were identified using identification Jupp keys (1996). Culex quinquefasciatus was used for oviposition and fitness experiments in the laboratory.

Results:Culex breeding sites are diversified, mostly found neighbouring of habitation. A total of seven Culex species were recorded including Cx quinquefasciatus (160.71%), Cx perfuscus (41.75%), Cx duttoni (90.97%), Cx antennatus (82.97%), Cx lutzia tigripes (7.51%), Cx pipiens pipiens (1.04%), Cx neavei (0.71%). Cx quinquefasciatus mosquito was the most represented specie during our study sample periods. High level of Permethrin (4 to 56%) and Deltamethrin (6 to 86.45%) resistance were recorded. In laboratory, Cx quinquefasciatus gravids females were attracted by oviposition sites of black or green colors. The ovipositions sites containing high NPK has greatly influenced their life history traits.

Conclusion/Recommandation: This study showed high resitances to Culex mosquitoes to pyrethroids, the influence of several physicals factors (type of breeding site, vegetation€¦) on the Culex population dynamics and chemical factors (NPK fertilizer) on their life history traits. These informations could be used to improve vector control strategies in the nature.

Key Words: Culex, oviposition, biodiversity, pyrethroids, physico-chemical characteristics.