Polio eradication.
N A
NA
Ward
H F
HF
Hull
D003906:Developing Countries; D004196:Disease Outbreaks; D006801:Humans; D017589:Immunization Programs; D011051:Poliomyelitis / Q000453:epidemiology / Q000517:prevention & control*; D011055:Poliovirus Vaccine, Oral / Q000008:administration & dosage*
D011055:Poliovirus Vaccine, Oral