Polio vaccination--a review of strategies.
D003906:Developing Countries; D006801:Humans; D007115:Immunization Schedule; D011051:Poliomyelitis / Q000453:epidemiology / Q000517:prevention & control*; D011055:Poliovirus Vaccine, Oral; D014611:Vaccination / Q000379:methods*; D014613:Vaccines, Attenuated
D011055:Poliovirus Vaccine, Oral; D014613:Vaccines, Attenuated