Urinary Tract Infections Guidelines

Introduction to Asymptomatic Bacteriuria

Asymptomatic bacteriuria should only be treated when the bacterial count is ≥10^5 CFU/mL, and only in specific populations such as pregnant women or before urologic procedures with anticipated mucosal bleeding, as recommended by the Infectious Diseases Society of America (IDSA) 1

The definition of significant bacteriuria depends on both the bacterial count and patient characteristics, with a traditional threshold of ≥10^5 CFU/mL for asymptomatic bacteriuria 1
Significant bacteriuria is defined as:

Treatment is recommended for:
The duration of therapy for pregnant women should be 3-7 days, as recommended by the IDSA 1
Antimicrobial therapy should be initiated shortly before the procedure and should not be continued after the procedure unless an indwelling catheter remains in place, as recommended by the IDSA 1

Pyuria accompanying asymptomatic bacteriuria is not an indication for antimicrobial treatment, as recommended by the IDSA 1
In catheterized patients, pyuria has no predictive value in differentiating symptomatic UTI from asymptomatic bacteriuria, according to the British Journal of Sports Medicine and the IDSA 3
Acquisition of bacteriuria is 3-5% per catheter day, and almost all patients with long-term catheters develop bacteriuria, as reported by the Clinical Infectious Diseases journal 4
Antimicrobial treatment may delay but not prevent the onset of bacteriuria, as reported by the Clinical Infectious Diseases journal 4
Development of antimicrobial resistance is a potential complication of treating asymptomatic bacteriuria, as reported by the British Journal of Sports Medicine and the American Academy of Family Physicians 2, 3
Adverse effects from antibiotics are also a potential complication of treating asymptomatic bacteriuria, as reported by the American Academy of Family Physicians 2
Recurrence with more resistant organisms, especially in catheterized patients, is another potential complication of treating asymptomatic bacteriuria, as reported by the Clinical Infectious Diseases journal 4

Mistaking colonization for infection can lead to overtreatment of ASB, as bacteria in the urine often represent colonization rather than infection requiring treatment 3
Treating pyuria without symptoms is not an indication for antimicrobial treatment, as pyuria accompanying asymptomatic bacteriuria is not an indication for treatment 1
The presence of multiple organisms may suggest contamination rather than true bacteriuria, although this fact is from a less preferred source 5