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Homozygous deficiency of the second component of complement presenting with recurrent bacterial meningitis
Archives of Disease in Childhood
|June 1, 1980
Insights
Recurrent meningitis in a girl and her brother was linked to a complement C2 deficiency. This genetic immune defect increases susceptibility to severe bacterial infections like pneumococcal meningitis.
Area of Science:
- Immunology
- Genetics
- Infectious Diseases
Background:
- Recurrent meningitis poses a significant health challenge, particularly in pediatric cases.
- Understanding the genetic basis of immune deficiencies is crucial for managing recurrent infections.
Observation:
- A girl experienced three episodes of purulent meningitis between ages 6 and 11.
- At age 16, a brother developed pneumococcal meningitis, suggesting a potential familial link.
- Complement studies revealed C2 deficiency in both affected siblings.
Findings:
- The patient and her brother exhibited a complete absence of complement C2.
- Intermediate C2 levels were observed in their mother and a sister, indicating a carrier state.
- This familial pattern strongly suggests a genetic basis for the observed C2 deficiency.
Implications:
- Complement C2 deficiency is associated with an increased risk of severe bacterial infections, including meningitis.
- Early diagnosis and genetic counseling are vital for families with a history of recurrent meningitis and identified complement deficiencies.
- This case highlights the importance of complement system evaluation in individuals with recurrent infections.
Abstract:
A girl presented with purulent meningitis at ages 6, 8, and 11 years. She was in good health between these three episodes. When aged 16 one of her brothers also experienced an attack of pneumococcal meningitis. Complement studies showed lack of C2 in the patient and the brother, and intermediate values in the mother and a sister. No other member of the family was available for study.