Cargando…

Changing patterns of West Nile virus transmission: altered vector competence and host susceptibility

West Nile virus (WNV) is a flavivirus (Flaviviridae) transmitted between Culex spp. mosquitoes and avian hosts. The virus has dramatically expanded its geographic range in the past ten years. Increases in global commerce, climate change, ecological factors and the emergence of novel viral genotypes...

Descripción completa

Detalles Bibliográficos
Autor principal: Brault, Aaron C.
Formato: Texto
Lenguaje:English
Publicado: EDP Sciences 2009
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2695027/
https://www.ncbi.nlm.nih.gov/pubmed/19406093
http://dx.doi.org/10.1051/vetres/2009026
_version_ 1782168149970386944
author Brault, Aaron C.
author_facet Brault, Aaron C.
author_sort Brault, Aaron C.
collection PubMed
description West Nile virus (WNV) is a flavivirus (Flaviviridae) transmitted between Culex spp. mosquitoes and avian hosts. The virus has dramatically expanded its geographic range in the past ten years. Increases in global commerce, climate change, ecological factors and the emergence of novel viral genotypes likely play significant roles in the emergence of this virus; however, the exact mechanism and relative importance of each is uncertain. Previously WNV was primarily associated with febrile illness of children in endemic areas, but it was identified as a cause of neurological disease in humans in 1994. This modulation in disease presentation could be the result of the emergence of a more virulent genotype as well as the progression of the virus into areas in which the age structure of immunologically naïve individuals makes them more susceptible to severe neurological disease. Since its introduction to North America in 1999, a novel WNV genotype has been identified that has been demonstrated to disseminate more rapidly and with greater efficiency at elevated temperatures than the originally introduced strain, indicating the potential importance of temperature as a selective criteria for the emergence of WNV genotypes with increased vectorial capacity. Even prior to the North American introduction, a mutation associated with increased replication in avian hosts, identified to be under adaptive evolutionary pressure, has been identified, indicating that adaptation for increased replication within vertebrate hosts could play a role in increased transmission efficiency. Although stable in its evolutionary structure, WNV has demonstrated the capacity for rapidly adapting to both vertebrate hosts and invertebrate vectors and will likely continue to exploit novel ecological niches as it adapts to novel transmission foci.
format Text
id pubmed-2695027
institution National Center for Biotechnology Information
language English
publishDate 2009
publisher EDP Sciences
record_format MEDLINE/PubMed
spelling pubmed-26950272009-06-29 Changing patterns of West Nile virus transmission: altered vector competence and host susceptibility Brault, Aaron C. Vet Res Review Article West Nile virus (WNV) is a flavivirus (Flaviviridae) transmitted between Culex spp. mosquitoes and avian hosts. The virus has dramatically expanded its geographic range in the past ten years. Increases in global commerce, climate change, ecological factors and the emergence of novel viral genotypes likely play significant roles in the emergence of this virus; however, the exact mechanism and relative importance of each is uncertain. Previously WNV was primarily associated with febrile illness of children in endemic areas, but it was identified as a cause of neurological disease in humans in 1994. This modulation in disease presentation could be the result of the emergence of a more virulent genotype as well as the progression of the virus into areas in which the age structure of immunologically naïve individuals makes them more susceptible to severe neurological disease. Since its introduction to North America in 1999, a novel WNV genotype has been identified that has been demonstrated to disseminate more rapidly and with greater efficiency at elevated temperatures than the originally introduced strain, indicating the potential importance of temperature as a selective criteria for the emergence of WNV genotypes with increased vectorial capacity. Even prior to the North American introduction, a mutation associated with increased replication in avian hosts, identified to be under adaptive evolutionary pressure, has been identified, indicating that adaptation for increased replication within vertebrate hosts could play a role in increased transmission efficiency. Although stable in its evolutionary structure, WNV has demonstrated the capacity for rapidly adapting to both vertebrate hosts and invertebrate vectors and will likely continue to exploit novel ecological niches as it adapts to novel transmission foci. EDP Sciences 2009 2009-05-01 /pmc/articles/PMC2695027/ /pubmed/19406093 http://dx.doi.org/10.1051/vetres/2009026 Text en © INRA, EDP Sciences, 2009 http://creativecommons.org/licenses/by-nc/3.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution-Noncommercial License (http://creativecommons.org/licenses/by-nc/3.0/), which permits unrestricted use, distribution, and reproduction in any noncommercial medium, provided the original work is properly cited.
spellingShingle Review Article
Brault, Aaron C.
Changing patterns of West Nile virus transmission: altered vector competence and host susceptibility
title Changing patterns of West Nile virus transmission: altered vector competence and host susceptibility
title_full Changing patterns of West Nile virus transmission: altered vector competence and host susceptibility
title_fullStr Changing patterns of West Nile virus transmission: altered vector competence and host susceptibility
title_full_unstemmed Changing patterns of West Nile virus transmission: altered vector competence and host susceptibility
title_short Changing patterns of West Nile virus transmission: altered vector competence and host susceptibility
title_sort changing patterns of west nile virus transmission: altered vector competence and host susceptibility
topic Review Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2695027/
https://www.ncbi.nlm.nih.gov/pubmed/19406093
http://dx.doi.org/10.1051/vetres/2009026
work_keys_str_mv AT braultaaronc changingpatternsofwestnilevirustransmissionalteredvectorcompetenceandhostsusceptibility