DS's symptoms have mainly been digestive; however, his CF doctor in the city has indicated that CFers are born with normal lungs, but because it's a progressive disease, the lung will become affected at some point, so it's important to do CPT 2-4 times a day to keep the lungs healthy. Our local CF clinic is more reactive than proactive, recently at one of our walk meetings a mom of a toddler wcf indicated that they only just started doing CPT and that was because her child was hospitalized for pneumonia.