Resistance to Rous sarcoma elicited by immunization with live virus.
D000818:Animals; D000917:Antibody Formation; D001358:Avian Sarcoma Viruses / Q000276:immunology*; D002645:Chickens; D006378:Helper Viruses; D007114:Immunization; D009500:Neutralization Tests; D001357:Sarcoma, Avian / Q000276:immunology*