West Nile virus
US /ˌwest naɪl ˈvaɪrəs/
UK /ˌwest naɪl ˈvaɪrəs/

1.
virus del Nilo occidentale
a flavivirus of African origin that is transmitted by mosquitoes and causes a disease of birds, horses, and humans, in whom it typically causes a mild feverish illness but can occasionally cause encephalitis or meningitis.
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The health department issued a warning about the spread of West Nile virus.
Il dipartimento della salute ha emesso un avviso sulla diffusione del virus del Nilo occidentale.
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Symptoms of West Nile virus can range from mild to severe.
I sintomi del virus del Nilo occidentale possono variare da lievi a gravi.