title: Progress towards global polio eradication – status of wild poliovirus circulation in Africa, 2011.
mesh_terms: D000349:Africa / Q000453:epidemiology; D060740:Disease Eradication; D004196:Disease Outbreaks / Q000517:prevention & control; D019353:Endemic Diseases / Q000517:prevention & control; D006801:Humans; D032541:Mass Vaccination; D011051:Poliomyelitis / Q000453:epidemiology / Q000517:prevention & control*; D011159:Population Surveillance