The titration of vaccinia virus on the chorioallantoic membrane of the developing chick embryo.
D000818:Animals; D002642:Chick Embryo; D049033:Chorioallantoic Membrane; D047108:Embryonic Development; D006801:Humans; D014615:Vaccinia; D014616:Vaccinia virus; D015017:Yolk Sac
VACCINIA/virus; YOLK SAC