Urinary Tract Infection

  • P. Weiner
  • D. Kaye
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 224)


Urinary tract infection exists when bacteria are present in urine in the bladder. Significant bacteriuria ( ≥105 organisms/ml of urine) defines the numbers of bacteria in midstream clean voided urine that exceed the numbers usually caused by contamination from the anterior urethra. Urinary tract infections can be categorized anatomically into lower tract infection (i.e. involving the bladder) and upper tract infection (infection in the kidney). Cystitis refers to lower tract infection associated with symptoms of frequency, urgency and/or dysuria. One third of patients with cystitis have asymptomatic upper tract infection. The urethral syndrome refers to symptoms of dysuria, frequency, and/or urgency associated with ≤105 bacteria per ml of urine. One third of patients with this syndrome have lower tract bacterial infection with bacteria in the bladder as demonstrated by suprapubic bladder aspiration. Acute pyelonephritis refers to upper tract infection associated with symptoms of fever and flank pain. Symptoms of lower tract infection frequently accompany pyelonephritis. Most urinary tract infection is asymptomatic, i.e. asymptomatic bacteriuria. One third of patients with asymptomatic bacteriuria havex upper tract infection.


Urinary Tract Infection Chronic Prostatitis Acute Pyelonephritis Asymptomatic Bacteriuria Chronic Bacterial Prostatitis 
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Copyright information

© Plenum Press, New York 1987

Authors and Affiliations

  • P. Weiner
    • 1
  • D. Kaye
    • 1
  1. 1.Department of MedicineThe Medical College of PennsylvaniaPhiladelphiaUSA

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