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A UTI is an infection in the urinary tract. Infections are caused by microbesâorganisms too small to be seen without a microscope. Bacteria are the most common cause of UTIs. Normally, bacteria that enter the urinary tract are quickly removed by the body before they cause symptoms.
1 20-30% have a recurrent UTI (2 infections in 6 months, or more than 3 infections a year). 2  Women have a lifetime risk of over 50% of developing a urinary tract infection. 3  The majority of urinary tract infections are caused by the E. Coli bacterium. urinary tract infection (UTI) is an infection of any part of the urinary system. 2 Most infections involve the lower urinary tract. The urinary tract is comprised of the bladder, kidneys, ureters and urethra.