severe combined immunodeficiency 名詞
  重度聯合免疫缺陷症
  severe combined immunodeficiency
       n : 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]