Overview:The absorbing story of David Vetter (1971-84), who had severe combined immunodeficiency and lived inside a sterile plastic chamber for 12 years. Included: comments from his mother, Carol Ann Vetter Demaret; and from doctors, who discuss their feelings about the use of the plastic chamber. Also: examinations of the boy's birth and his death, which occurred following a bone-marrow transplant from his sister.