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FcgammaRIIIb and complement component C7 codeficiency in a patient with recurrence of fulminant meningococcal septic

Anne-Lise Debard1, Brigitte Lamy, Guillaume Monneret

  • 1Immunology Laboratory, Lyon-Sud University Hospital, Pierre-Benite, France.

Clinical Infectious Diseases : an Official Publication of the Infectious Diseases Society of America
|May 13, 2005
PubMed

Insights

Late complement component deficiencies typically cause mild meningococcal disease. This study details a C7-deficient patient experiencing severe meningococcal disease, linked to absent FcgammaRIIIb on neutrophils.

Area of Science:

  • Immunology
  • Infectious Diseases
  • Genetics

Background:

  • Deficiencies in late complement components (C5-C9) are known to increase susceptibility to recurrent Neisseria meningitidis infections.
  • These infections are typically characterized by mild clinical presentations, despite the crucial role of the terminal complement pathway in bacterial lysis.

Observation:

  • This report details a case of recurrent meningococcal disease in a patient with a specific deficiency in complement component C7.
  • The patient presented with an unusually severe, fulminant clinical course, contrasting with the typical mild presentation associated with late complement deficiencies.

Findings:

  • Genetic analysis revealed a total deficiency of the Fc receptor for IgG on neutrophils, specifically FcgammaRIIIb, in the affected patient.
  • This absence of FcgammaRIIIb is hypothesized to be a contributing factor to the unusually severe clinical presentation observed.

Implications:

  • This case highlights that FcgammaRIIIb deficiency can exacerbate meningococcal disease severity, even in the context of late complement component deficiencies.
  • Understanding these combined immune defects is crucial for predicting disease course and developing targeted therapeutic strategies for meningococcal infections.

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