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Why newborn screening for severe combined immunodeficiency is essential: a case report
Mehdi M Adeli1, Rebecca H Buckley
1Division of Pediatric Allergy and Immunology, Department of Pediatrics, Duke University Medical Center,Durham, North Carolina, USA.
Pediatrics
|July 7, 2010
Summary
Physicians must recognize low absolute lymphocyte counts (ALCs) in infants, as persistent lymphopenia can indicate severe combined immunodeficiency (SCID). Early diagnosis via newborn screening is crucial for timely treatment and improved infant survival.
Area of Science:
- Pediatric Immunology
- Neonatal Screening
- Immunodeficiency Disorders
Background:
- Normal absolute lymphocyte counts (ALCs) are critical for infant health.
- ALC below 2500/microL in infants warrants medical evaluation.
- Understanding age-specific ALC ranges is essential for pediatricians.
Observation:
- A 4-month-old infant presented with chronic symptoms including oral ulcers, fever, and respiratory illness.
- The infant had persistent lymphopenia that was not initially recognized.
- Diagnosis revealed RAG2-deficient severe combined immunodeficiency (SCID) with T(-)B(-)NK(+) cells.
Findings:
- The infant developed severe viral infections (parainfluenza 3, adenovirus) before a bone marrow transplant could be administered.
- Delayed diagnosis of SCID due to unrecognized lymphopenia led to a fatal outcome.
- Newborn screening for SCID could enable early diagnosis and intervention.
Implications:
- Implementing newborn screening for SCID is vital for early detection and treatment.
- Screening can define the incidence and spectrum of T-cell defects.
- Pediatricians must be aware of normal ALC ranges to facilitate early SCID diagnosis.
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