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Recurrent pneumococcal meningitis in a patient with transient IgG subclass deficiency
1Department of Pediatrics, Faculty of Medicine, Kyushu University, Fukuoka, Japan.
Acta Paediatrica Japonica : Overseas Edition
|April 1, 1995
Summary
A young boy experienced severe infections due to a temporary imbalance in immunoglobulin G (IgG) subclasses, specifically low IgG2 and IgG4 levels. His antibody response improved with vaccination, resolving infections.
Area of Science:
- Pediatric Immunology
- Infectious Diseases
Background:
- Recurrent serious infections in early childhood can indicate underlying immune system dysfunction.
- Immunoglobulin G (IgG) subclass deficiencies can impair specific antibody responses, particularly to polysaccharide antigens.
Observation:
- A 3-year-old boy presented with recurrent severe infections, including pneumococcal meningitis, hepatitis, and arthritis.
- Initial investigations revealed normal total serum IgG but low IgG2, undetectable IgG4, and negligible pneumococcus-specific IgG1-G2 antibody levels.
- No other primary immunodeficiency was identified.
Findings:
- A transient deficiency in IgG subclasses (IgG2, IgG4) was observed during the second year of life.
- The patient demonstrated a delayed development of anti-polysaccharide antibody response.
- Serum IgG2-G4 levels normalized by 30 months of age, coinciding with improved infection control.
Implications:
- This case highlights transient IgG subclass deficiency as a cause of recurrent infections in children.
- It underscores the importance of assessing IgG subclass levels and specific antibody responses in evaluating pediatric infections.
- Successful immunization post-normalization suggests the potential for recovery and effective management of such conditions.