Vector competence of northern and southern European Culex pipiens pipiens mosquitoes for West Nile virus across a gradient of temperatures.

Autor: Vogels CBF; Laboratory of Entomology, Wageningen University & Research, Wageningen, The Netherlands., Göertz GP; Laboratory of Virology, Wageningen University & Research, Wageningen, The Netherlands., Pijlman GP; Laboratory of Virology, Wageningen University & Research, Wageningen, The Netherlands., Koenraadt CJM; Laboratory of Entomology, Wageningen University & Research, Wageningen, The Netherlands.
Jazyk: angličtina
Zdroj: Medical and veterinary entomology [Med Vet Entomol] 2017 Dec; Vol. 31 (4), pp. 358-364. Date of Electronic Publication: 2017 Jul 28.
DOI: 10.1111/mve.12251
Abstrakt: In Europe, West Nile virus (WNV) outbreaks have been limited to southern and central European countries. However, competent mosquito vectors and susceptible bird hosts are present in northern Europe. Differences in temperature and vector competence of mosquito populations may explain the absence of WNV outbreaks in northern Europe. The aim of the present study was to directly compare vector competence of northern and southern European Culex pipiens (Cx. p.) pipiens mosquitoes for WNV across a gradient of temperatures. WNV infection and transmission rates were determined for two Cx. p. pipiens populations originating from The Netherlands and Italy, respectively. Mosquitoes were orally exposed by providing an infectious bloodmeal, or by injecting WNV (lineage 2) in the thorax, followed by 14-day incubation at 18, 23, or 28 °C. No differences in infection or transmission rates were found between the Cx. p. pipiens populations with both infection methods, but WNV transmission rates were significantly higher at temperatures above 18 °C. The absence of WNV outbreaks in northern Europe cannot be explained by differences in vector competence between Cx. p. pipiens populations originating from northern and southern Europe. This study suggests that low temperature is a key limiting factor for WNV transmission.
(© 2017 The Authors. Medical and Veterinary Entomology published by John Wiley & Sons Ltd on behalf of Royal Entomological Society.)
Databáze: MEDLINE
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