| severe combined immunodeficiency 
 
 a congenital disease affecting T cells that can result from a mutation in any one of several different genes;
 children with it are susceptible to infectious disease;
 if untreated it is lethal within the first year or two of life
 • Syn:
 severe combined immunodeficiency disease, SCID
 • Hypernyms:
 immunodeficiency, monogenic disorder, monogenic disease
 • Hyponyms:
 ADA-SCID, X-linked SCID, X-SCID
 
 
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