Is there bacteria in the urine?

Urine is usually free of bacteria.

The urinary system has a defense mechanism to prevent bacterial invasion. Therefore, under normal circumstances, urine is free of bacteria. If bacteria are detected in urine, it is usually a sign of urinary system infection, which may be related to urethritis, cystitis and pyelonephritis. It is usually caused by bacteria, especially E. coli, which can cause frequent urination, urgency, urinary pain, fever, chills, headache and other symptoms. Also note that bacteria in urine may be due to contamination of urine samples. For example, when urine samples are collected, bacteria may be introduced if they are not cleaned properly, resulting in false positive results.