Need for polio boosters after age two years.
Rennels
Margaret B
MB
D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D014943:Global Health; D006801:Humans; D017589:Immunization Programs; D007115:Immunization Schedule; D007117:Immunization, Secondary; D007223:Infant; D011051:Poliomyelitis / Q000453:epidemiology / Q000517:prevention & control*; D017955:Poliovirus / Q000276:immunology*; D011054:Poliovirus Vaccine, Inactivated / Q000008:administration & dosage*; D011055:Poliovirus Vaccine, Oral / Q000008:administration & dosage*
D011054:Poliovirus Vaccine, Inactivated; D011055:Poliovirus Vaccine, Oral