History and recent developments of smallpox vaccine.
D000328:Adult; D000818:Animals; D002642:Chick Embryo; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D011817:Rabbits; D012899:Smallpox / Q000517:prevention & control*; D012900:Smallpox Vaccine; D014611:Vaccination; D014613:Vaccines, Attenuated
D012900:Smallpox Vaccine; D014613:Vaccines, Attenuated