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[Familial deficiency of complement factor 7: association with bacterial meningitis. Apropos of 3 recent cases]
M Drancourt1, D Raoult, P Lesavre
1Clinique des Maladies Infectieuses, Hôpital de la Conception, Marseille, France.
Abstract:
Three recent cases of inherited deficiency of the seventh component of complement (C7) associated with recurrent infectious meningitis are described. Two cases were associated with meningococcal meningitis, the third is the first case report of C7 inherited deficiency associated with Haemophilus parainfluenzae meningitis. Family studies are consistent with inheritance and non-HLA-linked, autosomal codominant trait of the C7 deficiency. The three patients have remained well, following antibiotic treatment.
Insights
Inherited deficiency of the seventh component of complement (C7) is linked to recurrent meningitis. This study reports three cases, including the first associated with Haemophilus parainfluenzae, highlighting a rare genetic immune disorder.
Area of Science:
- Immunology
- Genetics
- Infectious Diseases
Background:
- The complement system is crucial for innate immunity.
- Deficiencies in complement components can lead to increased susceptibility to infections.
- Inherited C7 deficiency is a rare condition affecting immune response.
Observation:
- Three patients with recurrent meningitis were identified.
- Two patients had Neisseria meningitidis infections.
- One patient presented with Haemophilus parainfluenzae meningitis, a novel association.
Findings:
- All three patients exhibited inherited deficiency of the seventh complement component (C7).
- Family studies indicated an autosomal codominant, non-HLA-linked inheritance pattern for C7 deficiency.
- The genetic basis for C7 deficiency was confirmed through family analysis.
Implications:
- Inherited C7 deficiency predisposes individuals to severe bacterial meningitis.
- This finding expands the spectrum of pathogens associated with C7 deficiency.
- Early diagnosis and antibiotic treatment are vital for managing patients with C7 deficiency.