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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.
Most UTIs are caused by A urinary tract infection is almost exclusively caused by Escherichia coli (E. coli) bacteria that travel to the bladder through the urethra, according to the University of Maryland Medical Center. Urinary tract infections (UTIs) can occur in any part of the urinary tract.