Failure of the thymus to develop, low circulating levels of lymphocytes, and failure of cell ^-mediated immunity characterize: A) human immunodeficiency virus 1 (HIV ^-1). B) antibody ^-mediated hypersensitivity. C) severe ^-combined immunodeficiency (SCID). D) acquired immunodeficiency syndrome (AIDS).

Question

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Severe-combined immunodeficiency (SCID) is characterized by the failure of the thymus to develop, leading to low levels of lymphocytes and impaired cell-mediated immunity.

Failure of the Thymus to Develop, Low Circulating Levels of Lymphocytes