Expanded Programme on Immunization (EPI).
D002675:Child, Preschool; D005060:Europe / Q000453:epidemiology; D005260:Female; D006306:Health Surveys; D006801:Humans; D017589:Immunization Programs / Q000592:standards*; D015994:Incidence; D007223:Infant; D008297:Male; D011051:Poliomyelitis / Q000453:epidemiology / Q000517:prevention & control*; D011055:Poliovirus Vaccine, Oral / Q000008:administration & dosage*; D014944:World Health Organization
D011055:Poliovirus Vaccine, Oral