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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 the primary organisms that cause UTIs. Most common bacteria that cause UTIs include: Escherichia coli and Staphylococcus saprophyticus. About 80-90% of urinary tract infections are caused by Escherichia coli (E. coli).