Which organisms are responsible for urinary tract infection (UTI)?

Updated: Jan 02, 2020
  • Author: John L Brusch, MD, FACP; Chief Editor: Michael Stuart Bronze, MD  more...
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Answer

E coli causes 70-95% of both upper and lower UTIs. Various organisms are responsible for the remainder of infections, including S saprophyticus, Proteus species, Klebsiella species, Enterococcus faecalis, other Enterobacteriaceae, and yeast. Some species are more common in certain subgroups, such as Staphylococcus saprophyticus in young women. However, S saprophyticus can produce acute cystitis in older women and in young men and should not be automatically regarded as a contaminant in the urine cultures of these individuals. [7]


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