title: Ecologic studies of Venezuelan encephalitis virus in southeastern México. I. Introduction and study sites.
mesh_terms: D000818:Animals; D001717:Birds; D004197:Disease Reservoirs; D004199:Disease Vectors; D004463:Ecology; D004666:Encephalitis Virus, Venezuelan Equine / Q000254:growth & development / Q000302:isolation & purification; D004668:Encephalitis Viruses / Q000302:isolation & purification*; D004683:Encephalomyelitis, Equine / Q000453:epidemiology*; D007391:International Cooperation; D008800:Mexico; D008829:Microbiology / Q000193:education; D014481:United States