although only about 4,300 canadians are living with it, cystic fibrosis (cf) is the most common fatal genetic disease affecting children and young adults, according to
cystic fibrosis canada
. half of those who died with cf in the past five years were under the age of 37.
about one in five canadians carries one defective copy of the gene that causes cf, even though they do not have the disease themselves. when a child inherits two defective copies, one from each carrier parent, there’s a 25 per cent chance the child will be born with cf. that child will then go on to have a 50 per cent chance of being a carrier, and a 25 per cent chance he or she will not.
affecting primarily the lungs, pancreas and digestive system, cf symptoms include a persistent cough that produces thick mucus, shortness of breath, frequent chest infections, bowel issues, weight loss and fertility problems. complications include
diabetes, osteoporosis, liver disease, difficulty digesting fats and proteins, inability to absorb nutrients, sinus and other infections, and progressive lung damage. there is no cure.
cf is diagnosed via a “sweat test”, which measures a child’s salt content. if it’s higher than usual, they likely have cf. genetic and prenatal testing is also used, as are newborn screenings, which detected nearly 75 per cent of new cases in 2020.