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West Nile fever

Known as a vector for the West Nile virus, this Culex quinquefasciatus mosquito has landed on a human finger (CDC/James Gathany)

West Nile fever is caused by a virus transmitted by mosquitoes and whose reservoir includes wild birds and mosquitoes. Humans are mainly infected through mosquito bites, but infection can occur through organ transplantation and blood.

An incubation period of 3–14 days precedes symptoms. However, most human infections are asymptomatic. The majority of clinical cases are mild and present with flu-like symptoms. Severe cases with signs of encephalitis, meningo-encephalitis or meningitis, are most often observed among elderly. No specific therapy is available.

As it affects countries in Europe every year, West Nile fever is now recognised as a major cause of public health concern in this region. No vaccine is currently available. The main preventive measures are aimed at reducing exposure to mosquito bites.

 

 WEST NILE FEVER MAPS

 
West Nile fever map thumbnailWest Nile fever maps
ECDC publishes every Friday the West Nile fever maps: showing the present geographical distribution of the reported autochthonous human cases in EU and the neighbouring countries. View the maps   
About the maps: Understanding the maps
About West Nile fever surveillance:  EU Case definition  Historical data
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