Are we really safe from smallpox? Not quite yet. This is why.
D004196:Disease Outbreaks / Q000453:epidemiology* / Q000517:prevention & control; D004739:England; D005858:Germany; D006801:Humans; D012899:Smallpox / Q000453:epidemiology* / Q000517:prevention & control; D012900:Smallpox Vaccine; D014481:United States; D014611:Vaccination
D012900:Smallpox Vaccine