title: West Nile virus in the USA--an update.
authors.forename: R H
authors.initials: RH
authors.lastname: Carlson
mesh_terms: D025041:Animal Migration; D000818:Animals; D001717:Birds / Q000821:virology; D004197:Disease Reservoirs / Q000662:veterinary; D006801:Humans; D014481:United States / Q000453:epidemiology; D014901:West Nile Fever / Q000453:epidemiology* / Q000821:virology; D014902:West Nile virus