Which bacteria can cause a UTI?

Reviewed by Dr Jonah Mink, April 21'35 sec read

The cause of 75-95% of both upper and lower urinary tract infections (UTIs) is the bacterium Escherichia coli.

Otherwise known as E.coli, this bacterium enters the urinary tract from the gastrointestinal tract and can affect the bladder, urethra, ureters or kidneys.

The remainder of infections can be caused by various organisms, including:

  • Proteus mirabilis

  • Klebsiella species

  • Enterococcus faecalis

  • Other Enterobacteriaceae

  • Yeast

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