Cystic fibrosis (CF) is the most common fatal genetic disease affecting Canadian children and young adults. There is no cure. Cystic fibrosis causes various effects on the body, but mainly affects the digestive system and lungs. The degree of cystic fibrosis involvement differs from person to person. However, the persistence and ongoing infection in the lungs, with destruction of lungs and loss of lung function, eventually causes death in the majority of people who have cystic fibrosis. more... See more text