Asymptomatic bacteriuria

Definition

Asymptomatic bacteriuria is a bacterial Urinary tract infection that occurs without any of the usual symptoms.

Causes, incidence, and risk factors

Asymptomatic bacteriuria occurs in up to 6% of healthy individuals. It affects 18% of diabetics (mostly women) and 20% of elderly individuals (more often women than men). The reasons for the lack of symptoms are not well understood.

Most patients with asymptomatic bacteriuria do not need treatment because the bacteria isn't causing any harm. However, certain groups are at a higher risk for kidney infections if they develop asymptomatic bacteriuria. Those at risk include:

• People with Diabetes
  
• Elderly people
  
• Pregnant women - if asymptomatic bacteriuria is left untreated, up to 40% will develop a kidney infection (pyelonephritis).
  
• Renal (kidney) transplant patients
  
• Young children with vesicoureteral reflux
  
• Patients with infected Kidney stones
  

Symptoms
By definition, asymptomatic bacteriuria causes no symptoms of a Urinary tract infection

Signs and tests

Asymptomatic bacteriuria is detected by the discovery of significant bacterial growth in a urine culture taken from a urine sample.

Treatment

Not all patients with asymptomatic bacteriuria respond to treatment. Pregnant women, renal transplant recipients, children with vesicoureteral reflux and people with infected Kidney stones appear to be more likely to benefit from treatment with antibiotics.

In addition, if asymptomatic bacteriuria is found prior to a urological procedure, it should be treated to prevent complications of the procedure. The course of therapy in these cases depends on underlying risk factors.

Expectations (prognosis)

Most individuals with asymptomatic bacteriuria who do not have risk factors for complications do extremely well and do not have any increased rates of symptomatic infections or decrease in kidney function.