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Recurrent pneumococcal meningitis in homozygous C3 deficiency
1Department of Pediatrics, Ondokuz Mayis University Faculty of Medicine, Samsun, Turkey. mtotan@omu.edu.tr
Insights
Recurrent meningitis in a child was linked to congenital deficiencies in complement proteins C3 and CH50. This rare genetic condition increases susceptibility to severe bacterial infections like pneumococcal meningitis.
Area of Science:
- Immunology
- Genetics
- Pediatrics
Background:
- Congenital deficiencies in complement system proteins are uncommon genetic disorders.
- These deficiencies can impair the immune system's ability to fight infections, particularly encapsulated bacteria.
Observation:
- A 4-year-old girl presented with recurrent pneumococcal meningitis and otitis media.
- Cerebrospinal fluid analysis confirmed pneumococcal infection as the cause of meningitis.
- The patient and her brother exhibited low levels of Complement 3 (C3) and CH50, indicating a deficiency.
Findings:
- The study identified a familial C3 and CH50 deficiency in a Turkish family.
- The patient received vaccinations and antibiotic treatment, leading to a full recovery.
- This case highlights the link between complement deficiencies and severe, recurrent bacterial infections.
Implications:
- Early diagnosis of complement deficiencies is crucial for managing recurrent infections.
- Genetic screening can identify at-risk individuals within families.
- Understanding complement pathways is vital for developing targeted immunotherapies.
Abstract:
Congenital deficiencies of complement system proteins are rare. A 4-year-old girl was admitted for meningitis. She had had repeated attacks of pneumococcal meningitis and otitis media at the age of 3 years. Analysis of cerebrospinal fluid showed that this meningitis was due to pneumococcal infection. Complement 3 and CH50 values of the proband and her brother were low, while her parents were normal. The patient was given polyvalent pneumococcal and anti-haemophilus vaccines plus ceftriaxone. Recovery was complete after 15 days of antibiotic therapy. This is the first description of a case of recurrent meningitis with C3 and CH50 deficiency in a Turkish family.