The lungs are a major organ in the body, but they are also most vulnerable to the mucus generated by cystic fibrosis. Because the tubes that absorb oxygen from the air are so fine, they can be blocked relatively easily. Furthermore, the mucus forms a fertile breeding ground for bacteria, resulting in illness. Chest infections and bronchial infections are very common, as a shortness of breath and a pronounced wheeze. Continuous infection can result in the lungs not working properly.

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