Smallpox vaccination.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D002648:Child; D006801:Humans; D007223:Infant; D012899:Smallpox / Q000453:epidemiology / Q000517:prevention & control*; D012900:Smallpox Vaccine / Q000009:adverse effects; D014195:Travel; D014481:United States; D014611:Vaccination / Q000009:adverse effects
D012900:Smallpox Vaccine