David Vetter was born in 1971 with Severe Combined Immunodeficiency (SCID), a rare genetic disorder that leaves the body without a functioning immune system. Even minor infections could be fatal. To protect him, doctors placed him inside sterile plastic isolation chambers just seconds after birth. Over time, his living space expanded into a specially designed, filtered plastic environment, including a mobile suit that allowed limited movement outside the chamber. NASA engineers helped develop parts of the containment system. In 1983, doctors attempted a bone marrow transplant using cells from his sister. Although it initially seemed promising, the transplant carried a dormant Epstein-Barr virus that triggered an aggressive lymphoma. David died in 1984 at age 12. His case brought global awareness to SCID and helped accelerate research into bone marrow transplants, gene therapy, and newborn screening programs. Today, SCID is routinely screened for in many countries, and survival rates are dramatically higher with early treatment. David’s life, though confined, helped reshape modern immunology.