Expanded programme on immunization (EPI). Poliomyelitis in 1992.
D002675:Child, Preschool; D003431:Cross-Cultural Comparison; D006801:Humans; D007115:Immunization Schedule; D007223:Infant; D011051:Poliomyelitis / Q000453:epidemiology / Q000517:prevention & control*; D011055:Poliovirus Vaccine, Oral / Q000008:administration & dosage; D011159:Population Surveillance
D011055:Poliovirus Vaccine, Oral