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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.
A UTI develops when part of the urinary tract becomes infected, usually by bacteria. Bacteria can enter the urinary tract through the urethra or, more rarely, through the bloodstream. There is usually no obvious reason why the urinary tract gets infected, although some women find they develop a UTI after having sex.