Polio situation worldwide in 2008--update on the progress towards global eradication.
D014943:Global Health; D006801:Humans; D011051:Poliomyelitis / Q000453:epidemiology / Q000517:prevention & control*; D011055:Poliovirus Vaccine, Oral / Q000627:therapeutic use; D014944:World Health Organization
D011055:Poliovirus Vaccine, Oral