The introduction of anti-Rous sarcoma virus activity and chick embryo cell toxicity into human sera during processing.
D000818:Animals; D000937:Antigen-Antibody Reactions; D000992:Antitoxins; D001358:Avian Sarcoma Viruses / Q000276:immunology*; D002642:Chick Embryo; D005511:Food Handling; D005525:Food-Processing Industry; D006801:Humans; D011200:Poultry
D000992:Antitoxins