A Rare Case of Hemorrhagic Cystitis Following Influenza B Infection

Hemorrhagic cystitis is defined by the persistent hematuria and lower urinary tract symptoms in a patient who has no other bleeding manifestations or bacterial urinary tract infection.1,2. It is caused by viruses, bacteria such as Escherichia coli,chemical toxins, radiation and amyloidosis.1,2. Reported causative viruses are influenza A, B, adenoviruses 7,11,21 and 35, papoviruses, polyomaviruses, CMV, JC virus and herpes viruses. Hemorrhigic cystitis following influenza B infection is not common and as far as we know only one such case has been reported in the medical literature to date.3