WHO's attempts to eradicate polio are thwarted in Africa and Asia.
Dyer
Owen
O
D000349:Africa / Q000453:epidemiology; D001208:Asia / Q000453:epidemiology; D004196:Disease Outbreaks; D006801:Humans; D009549:Nigeria / Q000453:epidemiology; D011051:Poliomyelitis / Q000453:epidemiology* / Q000517:prevention & control*; D023321:Poliovirus Vaccines / Q000008:administration & dosage; D014944:World Health Organization
D023321:Poliovirus Vaccines