Note from the editors: WHO declares international spread of wild poliovirus a public health emergency of international concern.
D004196:Disease Outbreaks; D014943:Global Health; D006801:Humans; D007391:International Cooperation; D011051:Poliomyelitis / Q000453:epidemiology* / Q000517:prevention & control / Q000635:transmission* / Q000821:virology; D017955:Poliovirus / Q000472:pathogenicity*; D011634:Public Health; D014944:World Health Organization