title: Expanded programme on immunization (EPI). Poliomyelitis: sub-national immunization days.
mesh_terms: D002648:Child; D002675:Child, Preschool; D006801:Humans; D017589:Immunization Programs / Q000458:organization & administration*; D007223:Infant; D008389:Marketing of Health Services; D011051:Poliomyelitis / Q000517:prevention & control*; D011055:Poliovirus Vaccine, Oral; D013019:South Africa
chemical_list: D011055:Poliovirus Vaccine, Oral