An unusual case of acute cystitis associated with mixed flora in voided urine in an adult male. Kunin Calvin M Journal of clinical microbiology This report describes two episodes of acute cystitis associated with "mixed flora" in an elderly male following a cystoscopy. The initial episode was accompanied by pyuria and a positive nitrite test. Both episodes responded to treatment with nitrofurantoin. Urine cultures were negative prior to the episodes and at a 1-year follow-up. 10.1128/JCM.02510-13