title: West Nile virus activity--United States, 2005.
mesh_terms: D000818:Animals; D001717:Birds / Q000821:virology; D002645:Chickens / Q000821:virology; D009033:Culicidae / Q000821:virology; D006736:Horses / Q000821:virology; D006801:Humans; D014481:United States / Q000453:epidemiology; D014901:West Nile Fever / Q000453:epidemiology*; D014902:West Nile virus / Q000302:isolation & purification