World health day: in point of fact. A follow up feature.
D002648:Child; D014943:Global Health; D006801:Humans; D011051:Poliomyelitis / Q000453:epidemiology / Q000503:physiopathology / Q000517:prevention & control*; D011055:Poliovirus Vaccine, Oral; D014944:World Health Organization
D011055:Poliovirus Vaccine, Oral