Progress towards poliomyelitis eradication--Ethiopia, Somalia, Sudan January 2002-August 2003.
D000352:Africa, Northern / Q000453:epidemiology; D004196:Disease Outbreaks / Q000517:prevention & control*; D019353:Endemic Diseases; D006801:Humans; D017589:Immunization Programs; D011051:Poliomyelitis / Q000453:epidemiology / Q000517:prevention & control*; D011055:Poliovirus Vaccine, Oral / Q000008:administration & dosage*; D014481:United States
D011055:Poliovirus Vaccine, Oral