Inapparent infection with western equine encephalitis virus:  epidemiologic observations.
D000818:Animals; D058345:Asymptomatic Infections; D004667:Encephalitis Virus, Western Equine; D004679:Encephalomyelitis; D004683:Encephalomyelitis, Equine; D006736:Horses
ENCEPHALOMYELITIS, EQUINE