Depends on genes. The risk of acquiring cystic fibrosis (CF) depends on whether the parents of a child are carriers for the gene. It is estimated that about 1 in 20 americans are carriers of the CF gene. In order for a child to acquire the disease, both parents must be carriers. If both parents are carriers, there is then a 25% chance that the child will acquire the disease.
Varies. The risk varies by ethnic group - in the us caucations have a risk that is quoted as being from 1 in 2000 to 1 in 3500, Asian americans risk is somewhere around 1 in 31, 000.
Cystic fibrosis. CF is a genetic disease that from birth causes the body to produce a thick and sticky mucus. This mucus interferes with the ability to breath and digest food. It is life threatening, but with good management people can live into their 40s and beyond with it.