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severe combined immune deficiency

or severe combined immunodeficiency

noun Pathology.
  1. a group of rare congenital disorders in which both cell-mediated and humoral immunity are lacking, causing susceptibility to a wide variety of illnesses and an inability to live in a normal environment. Abbreviation: SCID
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

severe combined immunodeficiency in Medicine

severe combined immunodeficiency

n.
  1. A usually fatal congenital immune system disorder in which the body is unable to produce enough B cells and T cells to resist infection.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.