The description of the Documentary of the Boy in the Bubble:

On February 22, 1984, Carol Ann Vetter touched her 12-year-old son’s hand for the first time. David Vetter had spent his entire life inside a sterile isolator, with a protective layer of plastic shielding him from the world around him. Afflicted with a rare hereditary disease, severe combined immunodeficiency (SCID), David was defenseless against any germs. Now, his doctors were gambling on an experimental procedure to free him from his isolation — but David would live only two weeks in the outside world before succumbing to infection.
It seemed like torture for David to go through this for 12 years but doctors made a medical breakthrough. For one, in the bone marrow transplant “doctors later learned, contained traces of a dormant virus. Once inside David’s defenseless body, the virus spread rapidly, producing hundreds of cancerous tumors”.