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Recurrent meningococcal meningitis is usually related to terminal complement factor deficiencies (C5-C8); however it is not frequent with isolated primary C3 deficiency. Similarly, membranoproliferative glomerulonephritis has been described in association with primary C3 deficiencies and the presence of C3 nephritic factor. We present a case of an 18-year-old woman with relapsing meningococcal meningitis in whom membranoproliferative glomerulonephritis and persistent low serum C3 levels were found. A detailed immunological study was performed, but no other abnormalities in the complement components were found. C3 Nef was also negative. Moreover, the familiar complement studies showed an asymptomatic C4 deficiency in her mother and borderline C3 levels in her sister. The presence of persistent low serum C3 levels in the absence of other immunological abnormalities suggests that this is the cause of the relapsing meningococcal infections and the glomerular disease of this patient. We suggest that a complement deficiency, including isolated C3 deficiency, should be ruled out in all cases of relapsing meningitis. Further, the possibility of glomerular disease should be carefully considered in these patients.

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