West Nile virus (WNV)

West Nile virus (WNV) is a topic covered in the Guide to Diagnostic Tests.

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Organism

West Nile virus (WNV)

Although it first appeared in the U.S. in 1999, within 5 years WNV had established itself as endemic in the US.

Responsible agent is a single-strand RNA virus of the family Flavivirus.

Its enzootic cycle involves several species of mosquitoes and birds before infecting humans; however, it is transmitted to humans from the bite of Culex species of mosquitoes.

Incubation period of 2–14 days.

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