Case Report 21-vear old woman presented to the universi student health service with a 2-day history of increasing urinary frequency(尿频) along with urgency(尿急) and dysuria(小便困难 尿痛). Her urine had been pink or bloody for about 12 hours. She had no history of prior urinary tract infection. The patient had recently become sexually active and was using a diaphragm and spermicide 2016/5/5 E. coli-Junqi's Lecture2016/5/5 E.coli-Junqi's Lecture 3 Case Report 21-year old woman presented to the university student health service with a 2-day history of increasing urinary frequency（尿频） along with urgency（尿急） and dysuria（小便困难， 尿痛）. Her urine had been pink or bloody for about 12 hours. She had no history of prior urinary tract infection. The patient had recently become sexually active and was using a diaphragm and spermicide