Update on measles in the Americas.
D000569:Americas / Q000453:epidemiology; D002675:Child, Preschool; D004196:Disease Outbreaks / Q000517:prevention & control*; D006289:Health Planning Support; D006801:Humans; D017589:Immunization Programs / Q000458:organization & administration*; D007223:Infant; D007391:International Cooperation; D008457:Measles / Q000453:epidemiology / Q000517:prevention & control*; D010175:Pan American Health Organization