The territory of epidemiology: pentimento.
D003140:Communicable Disease Control / Q000266:history*; D004813:Epidemiology / Q000266:history*; D049673:History, 20th Century; D006801:Humans; D007251:Influenza, Human / Q000453:epidemiology / Q000266:history; D011054:Poliovirus Vaccine, Inactivated / Q000266:history
D011054:Poliovirus Vaccine, Inactivated