Answer: Repeated lung infection.
Explanation:
Cystic fibrosis is a genetic disorder that affects the lungs and digestive system of child. Kids that suffer from this disease are susceptible to repeated lung infections.
Recent high tech technology and medicines have improved the life of children suffering from this order.
in this disorder the ability of the epithelial cells to produce defective form of protein known as CFTR which is found in the lungs, sweat glands and digestive tract of body. This disrupts the normal electrolyte balance of the body and makes the mucus thick and hard to move.
This makes the child more susceptible and repeated to respiratory disorders.