Severe CD8 deficiency in a child with miliary tuberculosis

Area of Science:

• Immunology
• Pediatrics
• Infectious Diseases

Background:

• Severe CD8 deficiency can present in infants.
• Miliary tuberculosis is a disseminated form of TB.
• Primary immunodeficiencies require early diagnosis and management.

Observation:

• A 6-month-old boy presented with symptoms of miliary tuberculosis.
• The patient exhibited a severe deficiency in CD8+ T-cells upon initial presentation.

Findings:

• The CD8 deficiency was determined to be secondary to miliary tuberculosis.
• CD8+ T-cell counts returned to normal levels six months post-tuberculosis therapy.
• A genetic defect in ZAP-70, a cause of primary CD8 deficiency, was excluded.

Implications:

• This case highlights a potential complication of miliary tuberculosis in pediatric patients.
• It suggests that severe CD8 deficiency can be a transient, acquired condition in the context of active infection.
• Early identification and treatment of miliary TB may reverse acquired CD8 lymphopenia.