title: Imports of polio to China and western Africa threaten global eradication.
authors.forename: John
authors.initials: J
authors.lastname: Zarocostas
mesh_terms: D000354:Africa, Western / Q000453:epidemiology; D002681:China / Q000453:epidemiology; D006801:Humans; D010154:Pakistan / Q000453:epidemiology; D011051:Poliomyelitis / Q000453:epidemiology* / Q000517:prevention & control; D014195:Travel