Stephen J. Schueler, M.D.

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Urinary Infection Underlying Cause

Bacterial infections cause over 80 percent of urinary tract infections. Usually, the source of the bacteria is the stool or the vagina. Bacteria enter the urethra, and then spread to the bladder of kidneys. E. coli bacteria are the most common cause of urinary tract infection.

Less common bacterial causes of urinary tract infection include:

  • Staphylococcus saprophyticus
  • Staphylococcus aureus
  • Klebsiella pneumoniae
  • Proteus mirabilis
  • Enterococci
  • Pseudomonas aeruginosa
  • Enterobacter species

Rare causes of urinary tract infection include:
  • Fungi
  • Parasites
  • Viruses

Continue to Urinary Infection Types

Last Updated: Nov 30, 2010 References
Authors: Stephen J. Schueler, MD; John H. Beckett, MD; D. Scott Gettings, MD
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PubMed Urinary Infection References
  1. Christiaens TC, De Meyere M, Verschraegen G, Peersman W, Heytens S, De Maeseneer JM. Randomised controlled trial of nitrofurantoin versus placebo in the treatment of uncomplicated urinary tract infection in adult women. Br J Gen Pract. 2002 Sep;52(482):729-34. [12236276]
  2. Czaja CA, Hooton TM. Update on acute uncomplicated urinary tract infection in women. Postgrad Med. 2006 Jun-Jul;119(1):39-45. [16913646]
  3. Gomolin IH, Siami PF, Reuning-Scherer J, Haverstock DC, Heyd A; Oral Suspension Study Group. Efficacy and safety of ciprofloxacin oral suspension versus trimethoprim-sulfamethoxazole oral suspension for treatment of older women with acute urinary tract infection. J Am Geriatr Soc. 2001 Dec;49(12):1606-13. [11843992]
  4. Krcmery S, Hromec J, Demesova D. Treatment of lower urinary tract infection in pregnancy. Int J Antimicrob Agents. 2001 Apr;17(4):279-82. [11295408]
  5. McCarty JM, Richard G, Huck W, Tucker RM, Tosiello RL, Shan M, Heyd A, Echols RM. A randomized trial of short-course ciprofloxacin, ofloxacin, or trimethoprim/sulfamethoxazole for the treatment of acute urinary tract infection in women. Ciprofloxacin Urinary Tract Infection Group. Am J Med. 1999 Mar;106(3):292-9. [10190377]
  6. Milo G, Katchman EA, Paul M, Christiaens T, Baerheim A, Leibovici L. Duration of antibacterial treatment for uncomplicated urinary tract infection in women. Cochrane Database Syst Rev. 2005 Apr 18;(2):CD004682. [15846726]
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