Discontinuance of routine smallpox vaccination.
D002675:Child, Preschool; D004641:Emigration and Immigration; D006801:Humans; D012899:Smallpox / Q000517:prevention & control*; D012900:Smallpox Vaccine / Q000008:administration & dosage*; D014481:United States; D014611:Vaccination
D012900:Smallpox Vaccine