Host preferences and circadian rhythm of Culicoides (Diptera:Ceratopogonidae), vectors of African horse sickness and bluetongueviruses in Senegal [texte imprimé] / M. Fall, Auteur ; A G Fall, Auteur ; Mor Talla Seck, Auteur ; Jérémy Bouyer, Auteur ; M Diarra, Auteur ; R. Lancelot, Auteur ; Geoffrey Gimonneau, Auteur ; C Garros, Auteur ; M. T. Bakhoum, Auteur ; O. Faye, Auteur ; T Baldet, Auteur ; T Balenghien, Auteur . - Dakar (PRH, Sénégal) : ISRA/LNERV, 2015 . - 07p.
Langues : Anglais (eng)

Catégories :	SCIENCES, PRODUCTION ET PROTECTION ANIMALES
Mots-clés :	Identification de Culicoides, Santé Animale, Afrique, Transmission du Virus, Sénégal
Index. décimale :	L737-Pathologie du Cheval
Résumé :	tAfrican horse sickness- and bluetongue virus are orbiviruses transmitted by Culicoides biting midges(Diptera: Ceratopogonidae) to horses and to ruminants, respectively. Since the last epizootic outbreakof African horse sickness in 2007 in Senegal, extensive investigations have been undertaken to improveour knowledge on Culicoides species involved locally in the transmission of the virus. The purpose of thisstudy was to compare and quantify the host preferences of potential vectors of these orbiviruses on horseand sheep and to study their circadian rhythm. We found that Culicoides oxystoma and species of the sub-genus Avaritia (Culicoides imicola, Culicoides bolitinos and Culicoides pseudopallidipennis) had a preferencefor horse when compared to sheep (the predicted ratio between horse and sheep was 80 for C. oxystomaand 26 for C. imicola), and were mostly crepuscular: C. oxystoma had continuous activity throughout thediel with peaks in numbers collected after sunrise and sunset, while C. imicola was mostly nocturnal withpeak after sunset. Unexpectedly, species of the subgenus Lasiohelea was also collected during this study.This diurnal biting species was a nuisance pest for both animal species used as bait