title: Comparative studies on the histological picture of lesions in chick chorio-allantoic membranes infected with vaccinia, smallpox and alastrim viruses.
mesh_terms: D000818:Animals; D002642:Chick Embryo / Q000473:pathology; D003588:Cytopathogenic Effect, Viral; D005321:Extraembryonic Membranes / Q000473:pathology; D014616:Vaccinia virus / Q000472:pathogenicity*; D012901:Variola virus / Q000472:pathogenicity*