Field experience guides PAHO's vaccine director.
McCarthy
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D002648:Child; D002675:Child, Preschool; D003140:Communicable Disease Control; D003906:Developing Countries; D006801:Humans; D017589:Immunization Programs; D007223:Infant; D008457:Measles / Q000517:prevention & control; D010175:Pan American Health Organization; D011051:Poliomyelitis / Q000517:prevention & control