What is the most common cause of a urinary tract infection (UTI)?
The most common cause of a urinary tract infection (UTI) is the bacterium Escherichia coli (E. coli), which is typically found in the colon. In women, sexual intercourse can cause these bacteria to be introduced into the urinary tract and lead to a bladder infection (cystitis). Other bacteria including Chlamydia, Mycoplasma, and Gonorrhea, as well as the herpes virus can cause infections of the urethra (urethritis).
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