West Nile virus
noun [ S ] uk/ˌwest ˈnaɪl ˌvaɪə.rəs/ us/ˌwest ˈnaɪl ˌvaɪ.rəs/
西尼罗河病毒
a virus that is spread by mosquitoes (= small flying insects), can cause a fever, and seriously affects the brain in a small number of people
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