Superinfection of tumors with viruses.
D000818:Animals; D000917:Antibody Formation; D046508:Culture Techniques; D007106:Immune Sera; D009052:Leukemia Virus, Murine; D008722:Methods; D051379:Mice; D009522:Newcastle disease virus; D012513:Sarcoma, Experimental; D014721:Vesicular stomatitis Indiana virus
D007106:Immune Sera