From the Centers for Disease Control and Prevention. Progress toward poliomyelitis eradication--West Africa, 1997-September 1998.
D000354:Africa, Western / Q000453:epidemiology; D006801:Humans; D017589:Immunization Programs; D011051:Poliomyelitis / Q000453:epidemiology* / Q000517:prevention & control*; D011055:Poliovirus Vaccine, Oral / Q000008:administration & dosage*
D011055:Poliovirus Vaccine, Oral