Polio vaccine trials of 1935.
Berk
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D049673:History, 20th Century; D006801:Humans; D011051:Poliomyelitis / Q000266:history* / Q000517:prevention & control; D011054:Poliovirus Vaccine, Inactivated / Q000266:history*; D014481:United States
D011054:Poliovirus Vaccine, Inactivated