title: Progress towards interrupting wild   poliovirus transmission worldwide,   January 2007-April 2008.
mesh_terms: D000346:Afghanistan / Q000453:epidemiology; D014943:Global Health; D006801:Humans; D017589:Immunization Programs; D015994:Incidence; D007194:India / Q000453:epidemiology; D009549:Nigeria / Q000453:epidemiology; D010154:Pakistan / Q000453:epidemiology; D011051:Poliomyelitis / Q000453:epidemiology / Q000517:prevention & control* / Q000635:transmission; D011055:Poliovirus Vaccine, Oral / Q000627:therapeutic use; D011159:Population Surveillance
chemical_list: D011055:Poliovirus Vaccine, Oral