Expanded programme on immunization. Progress towards eradicating poliomyelitis from the Americas.
D000569:Americas / Q000453:epidemiology; D002675:Child, Preschool; D006801:Humans; D007223:Infant; D010175:Pan American Health Organization; D011051:Poliomyelitis / Q000453:epidemiology / Q000517:prevention & control*; D014611:Vaccination