A urine test for leukocytes (++++) often indicates the presence of a urinary tract infection. Most of the urinary tract infections are caused by Escherichia coli, after active treatment, patients can recover. The dangers of urinary tract infection: 1, first of all, in the acute attack of urinary tract infection patients will appear urinary frequency, urinary urgency, urinary pain, at the same time may be accompanied by back pain, fever uncomfortable symptoms, to bring inconvenience to the life. 2, recurrent episodes of urinary tract infection may lead to chronic pyelonephritis, and eventually may affect renal function, the development of chronic renal failure. 3, if the resistance is relatively poor, such as a combination of diabetes mellitus or immunodeficiency patients, the emergence of urinary tract infection. Deficiency patients, the emergence of urinary tract infection, often urinary tract infection is not easy to control, and even sometimes further aggravation of the infection, or even infectious shock, life-threatening possibility.