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A urinary tract infection (UTI) is an infection from microbes. These are organisms that are too small to be seen without a microscope. Most UTIs are caused by bacteria, but some are caused by fungi and in rare cases by viruses. UTIs are among the most common infections in humans. A UTI can happen anywhere in your urinary tract.
Bacteria Are to Blame. UTIs are usually caused by E. coli, bacteria that are normally found in the digestive tract and on the skin around the rectal and vaginal areas. When the bacteria enter the urethra, they can make their way up into the bladder and cause an infection.