Oral poliomyelitis vaccines.
Patriarca
P A
PA
D002648:Child; D006801:Humans; D017589:Immunization Programs; D011051:Poliomyelitis / Q000276:immunology / Q000517:prevention & control*; D011054:Poliovirus Vaccine, Inactivated; D011055:Poliovirus Vaccine, Oral
D011054:Poliovirus Vaccine, Inactivated; D011055:Poliovirus Vaccine, Oral