<s>[INST] <<SYS>> This is a medical question of type : frequency <</SYS>> How many people are affected by cystic fibrosis ? [/INST] Cystic fibrosis is a common genetic disease within the white population in the United States. The disease occurs in 1 in 2,500 to 3,500 white newborns. Cystic fibrosis is less common in other ethnic groups, affecting about 1 in 17,000 African Americans and 1 in 31,000 Asian Americans. </s>