Polio eradication: final 1% poses greatest challenge.
D002669:Child Welfare; D002675:Child, Preschool; D004196:Disease Outbreaks / Q000517:prevention & control / Q000706:statistics & numerical data; D014943:Global Health; D006291:Health Policy; D006292:Health Priorities; D006297:Health Services Accessibility / Q000592:standards; D006801:Humans; D007223:Infant; D020380:Needs Assessment; D011051:Poliomyelitis / Q000453:epidemiology / Q000517:prevention & control*; D011057:Politics; D011159:Population Surveillance