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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.
Sexually transmitted infections â including herpes, gonorrhea, chlamydia, and mycoplasma â can also cause UTIs. The following risk factors increase your chance of getting a UTI: 1  Having a shorter urethra.  Improper wiping, in women and girls (wiping from back to front can bring bacteria from the anus into the urethra)