| severe combined immunodeficiency | Group of rare congenital disorders characterised by impairment of both humoral and cell-mediated immunity, leukopenia, and low or absent antibody levels. It is inherited as an x-linked or autosomal recessive defect. About half of the patients with autosomal recessive scid are deficient in the enzyme adenosine deaminase. (12 Dec 1998) |
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| severe combined immunodeficient mice | Mice that lack both T and B lymphocytes and are used for transplantation and study of human lymphoid tissues resulting in a SCID-human mouse chimera. See: severe combined immunodeficiency. (05 Mar 2000) |
| severe postanoxic encephalopathy | Coma that develops a few days to 3 weeks after an acute hypoxic insult; the latter was usually severe enough to cause an initial bout of coma, which cleared, and was followed by a transient interval of apparent normality. Synonym: severe postanoxic encephalopathy. (05 Mar 2000) |
| congenital severe combined immunodeficiency | Disease, one form of which is caused by the lack of a transcription factor required for expression of HLA class II genes. (18 Nov 1997) |
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