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West Nile fever

No active outbreaks

N/A

Confirmed cases

N/A

Deaths

N/A

Case fatality rate

N/A

Countries affected

Clinical profile

Pathogen

RNA virus

Flaviviridae

Incubation

2–14 d

CFR (reference)

< 1 % (neuro-invasive : 3–15 %)

Vaccine

Not available

Treatment

Supportive care

Transmission

Arthropod vector
WHO factsheet →

Outbreak history

2025Italy
773 cases

Countries affected(1)

Italy

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