Poliomyelitis, 1956; the changing picture in the United States with Salk vaccine.
D035843:Biomedical Research; D006801:Humans; D011051:Poliomyelitis / Q000517:prevention & control*; D011054:Poliovirus Vaccine, Inactivated; D014481:United States
D011054:Poliovirus Vaccine, Inactivated
POLIOMYELITIS/prevention and control