Revaccination against smallpox.
D005260:Female; D006801:Humans; D008297:Male; D010564:Personnel, Hospital; D012899:Smallpox / Q000517:prevention & control*; D012900:Smallpox Vaccine / Q000008:administration & dosage; D013548:Sweden; D013997:Time Factors; D014611:Vaccination / Q000009:adverse effects
D012900:Smallpox Vaccine