The risk of bacteriuria (bacteria in the urine) is between three and six percent per day and prophylactic antibiotics are not effective in decreasing symptomatic infections.
菌尿症（英语：Bacteriuria）（尿裡面有細菌）的風險是每天介乎3-6%， 而預防性的抗生素對正在減少的徵狀性感染是沒有效果的。