"Cystic fibrosis (CF) is a genetic disease affecting about 30,000 people in the United States. It is more prevalent in Caucasians. The incidence among Ashkenazi Jews is similar to that for Tay-Sachs: About one in 29 Ashkenazi Jews is a carrier. Carriers have no symptoms, but when two carriers have a child there is a one in four chance that the child will have CF."
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