Management of Asymptomatic Catheter‑Associated Bacteriuria in Older Women with Urinary Fistula

Screening and Treatment Recommendations

The 2019 Infectious Diseases Society of America (IDSA) guidelines give a strong recommendation not to screen for or treat asymptomatic bacteriuria in patients with long‑term indwelling urinary catheters (>30 days). 1
The same strong recommendation applies to patients with short‑term catheters (<30 days); routine screening and treatment are discouraged. 1
For patients with a urinary fistula, the principle remains unchanged: antibiotics should be reserved for symptomatic infection only, because the fistula creates chronic colonization rather than true infection. 1
Positive urine cultures or pyuria in catheterized patients should not trigger treatment, as bacteriuria is nearly universal and not indicative of infection. 1
The presence of Streptococcus agalactiae does not alter the asymptomatic‑bacteriuria policy; treatment is not indicated solely based on organism type. 1

Fever meeting any of the following thresholds qualifies for treatment: oral temperature > 37.8 °C, repeated oral readings > 37.2 °C, rectal temperature > 37.5 °C, or an increase ≥ 1.1 °C from baseline. 2
New dysuria accompanied by urinary frequency, urgency, or new incontinence is a qualifying symptom. 2
Costovertebral‑angle pain or tenderness suggestive of pyelonephritis warrants antimicrobial therapy. 2
Rigors, shaking chills, or clear‑cut delirium are also indications for treatment. 2

Treating catheter‑associated asymptomatic bacteriuria increases Clostridioides difficile infection risk (7.5 % in treated patients vs 3.2 % in untreated patients; odds ratio 2.45). 2

Clinicians should avoid attributing nonspecific findings (e.g., confusion, fatigue, altered urine odor/color, falls) to a urinary tract infection unless one of the qualifying systemic or genitourinary signs is present. 2
Prompt reassessment is recommended whenever a qualifying symptom (fever, dysuria with frequency, CVA tenderness, or delirium) emerges. 2
When clinical deterioration occurs, alternative causes (medication effects, dehydration, other infections, metabolic disturbances) should be evaluated before assuming a urinary source. 2