title: Largest ever polio vaccination campaign.
mesh_terms: D000349:Africa / Q000453:epidemiology; D006801:Humans; D017589:Immunization Programs / Q000458:organization & administration*; D011051:Poliomyelitis / Q000453:epidemiology / Q000517:prevention & control*; D011055:Poliovirus Vaccine, Oral / Q000008:administration & dosage / Q000600:supply & distribution; D014944:World Health Organization
chemical_list: D011055:Poliovirus Vaccine, Oral