Lancet
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Urine from eight normal controls in whom an influenza-like illness developed contained high concentrations of fibrin-degradation products (F. D. P.), IgG, and C3. ⋯ The infection may have been caused by other viruses which produce upper-respiratory-tract infections and which are not readily diagnosed by serology. Urinary fibrin-degradation products are a well-known marker of glomerulonephritic activity and viral antigens may have induced an immune-complex glomerulonephritis in the 8 controls in whom an influenza-like disease developed. A larger normal population should be investigated during a virus epidemic.