Membranoproliferative glomerulonephritis associated with influenza A infection.

A 24-year-old man with normal renal function developed influenza A with subsequent onset of hematuria, proteinuria, hypocomplementemia, hypertension and acute kidney injury. Renal biopsy showed mesangial hypercellularity, intratubular red blood cell casts, mesangial immunoglobulin M and C3 deposition, arterial C3 and C1q deposition, and foot process effacement most consistent with membranoproliferative glomerulonephritis. Six months after presentation, all manifestations of the glomerulonephritis resolved. We report the only documented case of membranoproliferative glomerulonephritis associated with influenza A is reported.