Polio reconsidered.
D004196:Disease Outbreaks / Q000517:prevention & control; D006801:Humans; D007223:Infant; D011051:Poliomyelitis / Q000517:prevention & control; D011054:Poliovirus Vaccine, Inactivated; D011055:Poliovirus Vaccine, Oral; D014481:United States
D011054:Poliovirus Vaccine, Inactivated; D011055:Poliovirus Vaccine, Oral