Abstract
The association of cystic fibrosis and Down's syndrome has been documented for the first time in three cases. While the association may be considered as purely fortuitous, features common to both indicate a contrary possibility. Similar shared features include increased sodium content of parotid saliva, abnormal morphology of nailbed capillaries, autonomic dysfunction, an increased frequency of diabetes mellitus, and intestinal atresia. Cystic fibrosis probably occurs more frequently in children with mongolism than heretofore suspected. A sweat test is mandatory in a child, albeit a mongol, having recurrent pneumonia.

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