National immunisation days and global eradication of poliomyelitis.
John
T J
TJ
D003906:Developing Countries; D006801:Humans; D017589:Immunization Programs; D007223:Infant; D011051:Poliomyelitis / Q000517:prevention & control*; D011055:Poliovirus Vaccine, Oral
D011055:Poliovirus Vaccine, Oral