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Lymphopenia and Severe Combined Immunodeficiency (SCID) - Think Before You Ink.

Jahnavi Aluri1, Maya R Gupta1, Aparna Dalvi1

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Indian Journal of Pediatrics
|March 18, 2019
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Summary

Distinguishing severe combined immunodeficiency (SCID) from transient lymphopenia in infants is crucial. Detecting T cell receptor excision circles (TREC) and normal naive T cells helps identify temporary conditions, avoiding misdiagnosis of SCID.

Keywords:
Naïve T cellsSCIDTRECTransient lymphopenia

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Area of Science:

  • Immunology
  • Pediatrics

Background:

  • Severe combined immunodeficiency (SCID) is a critical primary immunodeficiency (PID) characterized by T cell lymphopenia (TCL).
  • Distinguishing SCID from transient lymphopenia secondary to infections is vital for accurate diagnosis and treatment.

Observation:

  • Patients suspected of SCID underwent analysis of lymphocyte subsets, naive T cells, and T cell receptor excision circles (TREC).
  • Assessment focused on evaluating thymic function to gauge the severity of T cell lymphopenia.

Findings:

  • Patients with transient lymphopenia exhibited detectable TREC levels and normal naive T cell subsets.
  • These patients showed normalization of absolute lymphocyte and T cell counts over a short period.

Implications:

  • Highlights the necessity of comprehensive immunological investigations in infants presenting with severe infections and lymphopenia.
  • Emphasizes the importance of differentiating SCID from temporary conditions to prevent misdiagnosis and ensure appropriate management.