title: Quantity of relative infectious and lethal activities of three strains of vaccinia virus in cell culture and chick embryo.
mesh_terms: D000818:Animals; D002642:Chick Embryo; D046508:Culture Techniques; D005321:Extraembryonic Membranes / Q000276:immunology; D014616:Vaccinia virus / Q000145:classification / Q000472:pathogenicity*; D014776:Virus Cultivation