title: Variability of variola and alastrim virus.
mesh_terms: D000818:Animals; D002642:Chick Embryo; D046508:Culture Techniques; D005321:Extraembryonic Membranes / Q000382:microbiology; D006386:Hemagglutination Tests; D006801:Humans; D008168:Lung; D051379:Mice; D009132:Muscles; D011817:Rabbits; D012867:Skin; D014616:Vaccinia virus / Q000472:pathogenicity; D012901:Variola virus / Q000472:pathogenicity; D014776:Virus Cultivation