Finding bacteria in a urine test does not always mean you have a urinary tract infection, or UTI. Sometimes bacteria are found in the urine even when a person has no signs or symptoms of an infection. This is called asymptomatic bacteriuria.

For most people, asymptomatic bacteriuria does not need to be treated with antibiotics.

What is asymptomatic bacteriuria?

Asymptomatic bacteriuria means bacteria are found in your urine, but you do not have symptoms that point to a UTI.

It is common in some groups, including older adults, people living in nursing homes and people who use urinary catheters.

Does bacteria in the urine always need treatment?

No.

For most people who do not have UTI symptoms, antibiotics do not provide a benefit. In some cases, taking antibiotics when they are not needed can cause harm.

Two important groups should usually be tested and treated for bacteria in the urine:

  • People who are pregnant
  • People who are going to have certain urinary procedures that may cause bleeding

Treatment can help prevent serious problems in these situations.

Why can unnecessary antibiotics be a problem?

Antibiotics are important when they are truly needed. But using them when there is no infection can cause problems.

These may include:

  • Side effects from the medicine
  • Drug interactions
  • Antibiotic resistance, which can make antibiotics less effective in the future
  • C. difficile infection, which can cause serious diarrhea
  • Extra health care costs

Why might unnecessary treatment happen?

A positive urine test can make it seem like a person has a UTI, even when they do not have symptoms.

The article explains that doctors and other health care professionals should avoid ordering urine cultures when there is no good reason to suspect an infection. Fewer unnecessary urine tests can lead to fewer unnecessary antibiotics.

What about older adults?

This can be especially challenging in older adults.

Older people may have bacteria in their urine even when they do not have a UTI. Symptoms such as confusion, falls or changes in bladder control are sometimes blamed on a UTI when a urine test is positive.

However, these symptoms alone do not mean the person has a urinary infection, and studies have not shown that antibiotics improve these problems when there are no other signs of a UTI.

What should I tell my health care provider?

If you are concerned about a possible UTI, tell your health care provider about any new symptoms you are having.

It may help to mention:

  • Pain or burning when you urinate
  • New or unusual urinary symptoms
  • When your symptoms started
  • Any recent changes in your health
  • Whether you have a urinary catheter
  • Whether you are pregnant or having a urinary procedure

Your health care provider can decide whether a urine test or antibiotics are needed.

The Bottom Line

Bacteria in the urine does not always mean you have a UTI.

If you do not have symptoms, antibiotics are usually not needed. Avoiding unnecessary urine tests and antibiotics can help prevent side effects and antibiotic resistance.

Pregnant people and people having certain urinary procedures are important exceptions and may need treatment.

About the Article

This review looked at ways health care teams can reduce unnecessary testing and antibiotic treatment for asymptomatic bacteriuria. The author found that following treatment guidelines, avoiding unnecessary urine cultures and using antibiotic stewardship programs can reduce unneeded antibiotic use. Some programs work well, while others require more resources and may have smaller benefits.

Source

Nicolle LE. Reducing Treatment of Asymptomatic Bacteriuria: What Works? Infectious Disease Clinics of North America. 2024;38:267–276.