[Homologous interference between active and inactivated virus in smallpox vaccine on the chorionallantoic membrane of the chick embryo].
D000818:Animals; D002642:Chick Embryo; D006801:Humans; D012900:Smallpox Vaccine; D012901:Variola virus
D012900:Smallpox Vaccine
SMALLPOX VACCINE; SMALLPOX VIRUS