Oral attenuated poliovirus vaccine.
D002648:Child; D002675:Child, Preschool; D006801:Humans; D007115:Immunization Schedule; D011051:Poliomyelitis / Q000453:epidemiology / Q000517:prevention & control; D011055:Poliovirus Vaccine, Oral / Q000627:therapeutic use*
D011055:Poliovirus Vaccine, Oral