West Nile virus (WNV) is a flavivirus, a member of the Japanese encephalitis family. West Nile virus infection is a zoonotic disease transmitted by a mosquito vector with wild birds serving as its reservoir. The infection is usually asymptomatic in endemic areas. West Nile virus is usually a self-limited, febrile, influenzalike illness with a short incubation period. The disease predominantly affects the nervous system and the most serious manifestations are fatal encephalitis and hepatitis.
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