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  • Title: [C2 deficiency discovered in pneumococcal meningitis].
    Author: Monfort-Gouraud M, Le Gall MA, Nicot F, Badoual J.
    Journal: Arch Fr Pediatr; 1993 Feb; 50(2):139-41. PubMed ID: 8343021.
    Abstract:
    BACKGROUND: Congenital deficiencies of complement system proteins are rare. Patients with C2 deficiency have a high incidence of vascularitis syndromes. Most patients with this deficiency have no problems with increased susceptibility to infection, most commonly due to pneumococci, presumably because of the protective function of the alternative pathway. CASE REPORT: A 22 month-old girl was admitted because of acute meningitis and otitis. She had had 2 episodes of otitis media at the age of 1 year. Analysis of the CSF showed that this meningitis was due to pneumococcal infection. Recovery was complete after 15 days of antibiotic therapy. Total hemolytic complement activity (CH50) was low during the infection; one month later, the CH50 value was about zero as was C2, while C3 and C4 were normal. The patient was given polyvalent pneumococcal and anti-Haemophilus vaccines plus prophylactic penicillin G. Laboratory tests for systemic lupus erythematosus were negative. CONCLUSION: A defect of complement function should be suspected in any patient with severe of recurring pyogenic infections. Complement disorders can be detected one month later by means of the relatively simple hemolytic complement assay.
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