They Didn't Understand Why Their Kids Kept Getting Sick. After A Rare Diagnosis, A New Gene Therapy Offered Hope.

Ava Langenhop was always sick. From "the time she was born," she was "just a sick baby," the 9-year-old's mother, Alicia Langenhop, told CBS News. She'd catch any cough or cold. Before she was two months old, she went to the hospital twice for viral ...Read more