title: Studies on a strain of vaccinia virus defective in surface antigen production.
mesh_terms: D000371:Agglutination; D000818:Animals; D000941:Antigens; D002417:Cattle; D002478:Cells, Cultured; D002642:Chick Embryo; D002645:Chickens; D004912:Erythrocytes / Q000276:immunology; D000882:Haplorhini; D007106:Immune Sera; D011817:Rabbits; D014616:Vaccinia virus / Q000276:immunology*
chemical_list: D000941:Antigens; D007106:Immune Sera