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Int. J. Environ. Res. Public Health 2013, 10(10), 4869-4895; doi:10.3390/ijerph10104869
Review

European Surveillance for West Nile Virus in Mosquito Populations

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1 Spiez Laboratory, Federal Office for Civil Protection, Austrasse, Spiez 3700, Switzerland 2 Zooprofilactic Institute Abruzzo and Molise "G. Caporale", Campo Boario, Teramo 64100, Italy 3 Department of Microbiology, Medical School, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece 4 Department of Wetland Ecology, Estación Biológica de Doñana, CSIC, Avda. Américo Vespucio s/n, Sevilla 41092, Spain 5 Friedrich-Loeffler-Institute, Federal Research Institute for Animal Health, Greifswald—Insel Riems, Südufer 17493, Germany 6 Public Health England, Medical Entomology group, MRA, Emergency Response Department, Porton Down, Salisbury SP4 0JG, UK 7 The Pirbright Institute, Ash Road, Pirbright GU24 0NF, UK 8 Institute of Land Use Systems, Leibnitz Centre for Agricultural Lanscape Research (ZALF), Eberswalder Strasse 84, Müncheberg 15374, Germany 9 German Centre for Infection Research (DZIF), Partner Site Hamburg-Luebeck-Borstel, Hamburg, Germany and German Mosquito Control Association (KABS), Waldsee and Bernhard-Nocht Institute for Tropical Medicine, Hamburg D-20359, Germany 10 Zooprofilactic Institute Venezie, Viale dell' Università, 10, Padua, 35020 Legnaro, Italy 11 Institute of Microbiology, Laboratory of Applied Microbiology, Via Mirasole 22a, Bellinzona CH-6500, Switzerland 12 Mosquito Working Group, via al Castello, Canobbio CH-6952, Switzerland 13 EcoDevelopment SA, Thermi 57001, Greece 14 Servicio de Control de Mosquitos, Diputación Provincial de Huelva, Huelva E-21003, Spain 15 CNM-Instituto de Salud Carlos III, Majadahonda, Madrid 28220, Spain 16 Zooprofilactic Institute Lombardy and Emilia Romagna "B. Ubertini", Brescia 25124, Italy 17 Institute of Parasitology, National Centre for Vector Entomology, University of Zurich, Winterthurerstr 266a, Zurich 8057, Switzerland 18 Animal Health and Veterinary Laboratories Agency, Woodham Lane, Surrey KT15, 3NB, UK
* Author to whom correspondence should be addressed.
Received: 15 August 2013 / Revised: 20 September 2013 / Accepted: 24 September 2013 / Published: 11 October 2013
(This article belongs to the Special Issue Epidemiology of West Nile Virus)
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Abstract

A wide range of arthropod-borne viruses threaten both human and animal health either through their presence in Europe or through risk of introduction. Prominent among these is West Nile virus (WNV), primarily an avian virus, which has caused multiple outbreaks associated with human and equine mortality. Endemic outbreaks of West Nile fever have been reported in Italy, Greece, France, Romania, Hungary, Russia and Spain, with further spread expected. Most outbreaks in Western Europe have been due to infection with WNV Lineage 1. In Eastern Europe WNV Lineage 2 has been responsible for human and bird mortality, particularly in Greece, which has experienced extensive outbreaks over three consecutive years. Italy has experienced co-circulation with both virus lineages. The ability to manage this threat in a cost-effective way is dependent on early detection. Targeted surveillance for pathogens within mosquito populations offers the ability to detect viruses prior to their emergence in livestock, equine species or human populations. In addition, it can establish a baseline of mosquito-borne virus activity and allow monitoring of change to this over time. Early detection offers the opportunity to raise disease awareness, initiate vector control and preventative vaccination, now available for horses, and encourage personal protection against mosquito bites. This would have major benefits through financial savings and reduction in equid morbidity/mortality. However, effective surveillance that predicts virus outbreaks is challenged by a range of factors including limited resources, variation in mosquito capture rates (too few or too many), difficulties in mosquito identification, often reliant on specialist entomologists, and the sensitive, rapid detection of viruses in mosquito pools. Surveillance for WNV and other arboviruses within mosquito populations varies between European countries in the extent and focus of the surveillance. This study reviews the current status of WNV in mosquito populations across Europe and how this is informing our understanding of virus epidemiology. Key findings such as detection of virus, presence of vector species and invasive mosquito species are summarized, and some of the difficulties encountered when applying a cost-effective surveillance programme are highlighted.
Keywords: West Nile virus; mosquito; surveillance; vector; invasive species West Nile virus; mosquito; surveillance; vector; invasive species
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Engler, O.; Savini, G.; Papa, A.; Figuerola, J.; Groschup, M.H.; Kampen, H.; Medlock, J.; Vaux, A.; Wilson, A.J.; Werner, D.; Jöst, H.; Goffredo, M.; Capelli, G.; Federici, V.; Tonolla, M.; Patocchi, N.; Flacio, E.; Portmann, J.; Rossi-Pedruzzi, A.; Mourelatos, S.; Ruiz, S.; Vázquez, A.; Calzolari, M.; Bonilauri, P.; Dottori, M.; Schaffner, F.; Mathis, A.; Johnson, N. European Surveillance for West Nile Virus in Mosquito Populations. Int. J. Environ. Res. Public Health 2013, 10, 4869-4895.

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