The problems of polio eradication.
Dove
Alan W
AW
D002648:Child; D003906:Developing Countries; D004196:Disease Outbreaks; D006801:Humans; D017589:Immunization Programs; D011051:Poliomyelitis / Q000453:epidemiology / Q000517:prevention & control*; D011055:Poliovirus Vaccine, Oral; D023321:Poliovirus Vaccines; D014611:Vaccination; D014944:World Health Organization
D011055:Poliovirus Vaccine, Oral; D023321:Poliovirus Vaccines