title: Vector competence of Culex neavei and Culex quinquefasciatus (Diptera: Culicidae) from Senegal for lineages 1, 2, Koutango and a putative new lineage of West Nile virus.
abstract: West Nile virus (WN virus) is one of the most widespread arbovirus and exhibits a great genetic diversity with 8 lineages, at least 4 (1, 2, Koutango, and putative new) are present in Africa. In West Africa, Culex neavei and Culex quinquefasciatus are considered as potential vectors for WN virus transmission in sylvatic or urban context. We analyzed the vector competence of these Culex species from Senegal for African lineages and envelope proteins sequences of viral strains used. We showed that lineage 1 is transmitted by both Culex mosquitoes, whereas the putative new lineage 8 is transmitted only by Cx. neavei. Our findings suggest that genetic variability can affect vector competence and depend on mosquito. However, when considering the infective life rate, the mosquito population seems to be inefficient for WN virus transmission in the field and could explain the low impact of WN virus in Africa.
authors.affiliation: Unité des Arbovirus et Virus de Fièvres Hémorragiques, Institut Pasteur de Dakar, BP220 Senegal; Unité d'Entomologie Médicale, Institut Pasteur de Dakar, Senegal.
authors.forename: Gamou
authors.initials: G
authors.lastname: Fall
authors.forename: Mawlouth
authors.initials: M
authors.lastname: Diallo
authors.forename: Cheikh
authors.initials: C
authors.lastname: Loucoubar
authors.forename: Ousmane
authors.initials: O
authors.lastname: Faye
authors.forename: Amadou Alpha
authors.initials: AA
authors.lastname: Sall
mesh_terms: D000818:Animals; D003465:Culex / Q000145:classification / Q000821:virology*; D007303:Insect Vectors / Q000821:virology*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012675:Senegal; D014901:West Nile Fever / Q000635:transmission*; D014902:West Nile virus / Q000145:classification / Q000235:genetics*