Further clinical studies with smallpox vaccine of chick-embryo origin.
D000818:Animals; D035843:Biomedical Research; D002645:Chickens; D006801:Humans; D012899:Smallpox / Q000276:immunology*; D012900:Smallpox Vaccine; D012901:Variola virus
D012900:Smallpox Vaccine
SMALLPOX/immunology