title: Expanded Programme on Immunization (EPI). Emerging polio-free zone in southern Africa.
mesh_terms: D000293:Adolescent; D000353:Africa, Southern / Q000453:epidemiology; D002648:Child; D002675:Child, Preschool; D005500:Follow-Up Studies; D006801:Humans; D007114:Immunization; D007117:Immunization, Secondary; D007223:Infant; D011051:Poliomyelitis / Q000453:epidemiology / Q000517:prevention & control*; D011054:Poliovirus Vaccine, Inactivated / Q000008:administration & dosage; D011055:Poliovirus Vaccine, Oral / Q000008:administration & dosage; D011159:Population Surveillance
chemical_list: D011054:Poliovirus Vaccine, Inactivated; D011055:Poliovirus Vaccine, Oral