POLIOMYELITIS vaccine; American trials in 1954.
D035843:Biomedical Research; D005006:Ethnicity; D006801:Humans; D011051:Poliomyelitis / Q000517:prevention & control*; D014481:United States; D014611:Vaccination; D014612:Vaccines
D014612:Vaccines
POLIOMYELITIS/prevention and control; VACCINES AND VACCINATION