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[C2 deficiency discovered in pneumococcal meningitis]

M Monfort-Gouraud1, M A Le Gall, F Nicot

  • 1Service de Pédiatrie B, Hôpital Saint-Vincent-de-Paul, Paris.

Archives Francaises De Pediatrie
|February 1, 1993
PubMed
Summary

Congenital complement deficiencies, like C2 deficiency, can increase infection risk. Early detection through complement assays is crucial for managing recurrent pyogenic infections.

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Area of Science:

  • Immunology
  • Clinical Medicine

Background:

  • Congenital deficiencies in complement system proteins are rare.
  • Patients with C2 deficiency often experience vascularitis syndromes.
  • Most C2-deficient individuals are not prone to infections due to alternative pathway protection.

Observation:

  • A 22-month-old girl presented with pneumococcal meningitis and recurrent otitis media.
  • Her cerebrospinal fluid analysis confirmed pneumococcal meningitis.
  • Hemolytic complement activity (CH50) was low during infection, with C2 levels near zero one month post-infection.

Findings:

  • The patient exhibited a severe deficiency in C2 complement protein.
  • Pneumococcal meningitis in a young child with C2 deficiency.
  • Normal C3 and C4 levels suggest a specific C2 defect.

Implications:

  • Complement disorders should be suspected in recurrent pyogenic infections.
  • Hemolytic complement assays can detect complement deficiencies.
  • Early diagnosis and management of complement deficiencies are vital for patient outcomes.

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