HISTORY OF SMALLPOX AND ITS PREVENTION.
D035843:Biomedical Research; D004813:Epidemiology; D006664:History; D006801:Humans; D012899:Smallpox; D012900:Smallpox Vaccine; D013882:Thiosemicarbazones; D014611:Vaccination; D012901:Variola virus
D012900:Smallpox Vaccine; D013882:Thiosemicarbazones
EPIDEMIOLOGY; HISTORY; SMALLPOX; SMALLPOX VACCINE; THIOSEMICARBAZONES; VACCINATION