An estimated 70,000 people worldwide have cystic fibrosis . Some may call me the poster boy for cystic fibrosis , but I do n't think anyone should have that title . The disease is caused by a defect in the body's immune system that causes it to attack healthy tissue and produce harmful chemicals called autoantibodies. Gunnar Esiason was diagnosed with CF when he was 2 . Now 23 , he says the disease has taught him to be resilient .
An estimated 70,000 people worldwide have cystic fibrosis . The disease is caused by a defect in the body's immune system that causes it to attack healthy tissue and produce harmful chemicals called autoantibodies. Gunnar Esiason was diagnosed with CF when he was 2 . Now 23 , he says the disease has taught him to be resilient .