Expanded programme on immunization (EPI). Poliomyelitis eradication activities in Shandong Province.
D002675:Child, Preschool; D002681:China; D006801:Humans; D007223:Infant; D011051:Poliomyelitis / Q000517:prevention & control*; D011055:Poliovirus Vaccine, Oral; D014611:Vaccination
D011055:Poliovirus Vaccine, Oral