Yellow fever vaccine. I. Development of a vaccine seed free from contaminating avian leukosis viruses.
D000818:Animals; D000831:Animals, Newborn; D001354:Avian Leukosis Virus; D002642:Chick Embryo; D005374:Filtration; D008567:Membranes, Artificial; D051379:Mice; D014765:Viral Vaccines; D014774:Virulence; D015004:Yellow Fever / Q000517:prevention & control*; D015005:Yellow fever virus / Q000302:isolation & purification* / Q000472:pathogenicity
D008567:Membranes, Artificial; D014765:Viral Vaccines