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Young's syndrome is a combination of chronic sinopulmonary infections and obstructive azoospermia in men. Cystic fibrosis and the "immotile cilia syndrome" must be ruled out. The most important methods in differential diagnosis are determination of sweat chloride and sodium levels, investigation of cilia ultrastructure and analysis of semen samples. A case of Young's syndrome in a 42-year-old patient is reported.
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