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Cystic fibrosis (CF) is a relatively common inherited disease in which from infancy there are recurrent chest infections causing lung damage, intestinal malabsorption leading to severe malnutrition and growth failure, and an excess of salt in the sweat. Untreated, the condition is usually fatal in infancy or early childhood. With modern treatment affected children now have a median survival of 30 years.

For more information see: Cystic fibrosis.