Smallpox vaccination.
D000328:Adult; D002675:Child, Preschool; D004485:Eczema / Q000517:prevention & control; D004660:Encephalitis / Q000517:prevention & control; D006801:Humans; D007231:Infant, Newborn; D012899:Smallpox / Q000453:epidemiology / Q000401:mortality / Q000517:prevention & control*; D014481:United States; D014611:Vaccination / Q000009:adverse effects*