There are bacteria in the urine. What causes it?

What causes bacteria in urine? Bacteria in urine are high, and the most common reasons are pollution and urinary tract infection. If you see an increase in bacteria in urine routine, but white blood cells do not increase, you need to consider the possibility of contamination. At this time, urine culture bacteria are generally below the third power of ten. The most common sources of pollution are urethral orifices and collection containers. Urinary tract infection is caused by pathogenic bacteria (very few of which can be fungi, chlamydia, protozoa, viruses) invading the urinary mucosa or tissues.