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The story of Catherine Kitz may not be a miracle, but it's close. The Montini senior distance runner was diagnosed with cystic fibrosis at 4 months old. She runs a fine line between appreciating her physical ability and resenting the confinements of the disease. Cystic fibrosis, for which there is treatment but no cure, is a life-threatening, genetic disease that causes mucus to build up and clog parts of the body, according to the Cystic Fibrosis Foundation website. The organs affected most are the lungs and pancreas — ironic, Broncos coach Pete Connelly notes, since lungs are among a distance runner's most vital organs.