title: Variability of Western equine encephalomyelitis virus. II. Pathogenicity of apathogenic and pathogenic virus variants.
mesh_terms: D000818:Animals; D001769:Blood / Q000382:microbiology; D001921:Brain / Q000382:microbiology; D003588:Cytopathogenic Effect, Viral; D004668:Encephalitis Viruses / Q000472:pathogenicity*; D005455:Fluorescent Antibody Technique; D005823:Genetics; D007422:Intestines / Q000382:microbiology; D008099:Liver / Q000382:microbiology; D051379:Mice; D013154:Spleen / Q000382:microbiology