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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.
Urinary Tract Infections. Urinary tract infections (UTIs) are so common that most of us get at least one at some point in our lives. They are usually caused by bacteria, such as E. coli, that get into the urethra and bladder (and occasionally the kidneys) from the gastrointestinal system. Trichomoniasis, chlamydia, and viruses can also cause UTIs.