Poliomyelitis immunization: 1969.
D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007114:Immunization; D007223:Infant; D011051:Poliomyelitis / Q000517:prevention & control*; D011055:Poliovirus Vaccine, Oral
D011055:Poliovirus Vaccine, Oral