A. Extraneous agents and their detection; oncogenic viruses.
D000818:Animals; D000830:Animals, Laboratory; D002642:Chick Embryo; D046508:Culture Techniques; D009174:Mycoplasma / Q000302:isolation & purification / Q000472:pathogenicity*; D009858:Oncogenic Viruses / Q000302:isolation & purification / Q000472:pathogenicity*; D014776:Virus Cultivation