Cystic Fibrosis is much more common in whites. In the United States, the incidence is estimated to be one in 2,000 live births in Caucasians, one in 17,000 live births in African Americans, and one in 90,000 live births in Asians. One in 29 Americans, more than 10 million people, is an unknowing, symptomless carrier of the defective gene. A child must inherit a defective copy of the CF gene, one from each parent, to have the disease.
If 2 people carry the gene and have a child there is: (with every pregnancy)
- A 1 in 4 chance that the child will have CF. (25%)
- A 2 in 4 chance that the child will not have CF but carry the gene. (50%)
- A 1 in 4 chance that the child will not have CF and will not be a carrier.(25%)