THE CONTINUING THREAT OF SMALLPOX.
D003140:Communicable Disease Control; D006801:Humans; D012899:Smallpox; D012900:Smallpox Vaccine; D014481:United States; D012901:Variola virus
D012900:Smallpox Vaccine
COMMUNICABLE DISEASE CONTROL; SMALLPOX; SMALLPOX VACCINE; UNITED STATES