Culture-confirmed Bacterial Species Causing Recurrent Urinary Tract Infection Among Adult Women

Area of Science:

• Urology
• Infectious Diseases
• Epidemiology

Background:

• Recurrent urinary tract infections (UTIs) affect a significant portion of adult women, with over 25% experiencing multiple episodes.
• The high incidence of recurrent UTIs raises questions about potential persistent bacterial reservoirs within the urinary tract.

Purpose of the Study:

• To determine the proportion of recurrent UTIs caused by the same bacterial species in women.
• To identify host characteristics associated with consistent bacterial species across recurrent UTI episodes.

Main Methods:

• A retrospective observational study design was employed, analyzing data from adult women with recurrent UTIs.
• Urinary tract infection was defined by specific urine culture criteria (≥10,000 CFU/mL of a single species) and clinical signs/symptoms.
• Logistic regression with generalized estimating equations was used to analyze species consistency and associated host factors.

Main Results:

• The study included 181 women with 496 UTI episodes; 75.9% of 315 infection pairs involved the same bacterial species.
• Women over 65 were less likely to have consistent species across episodes (OR 0.35).
• No significant associations were found between species consistency and race, ethnicity, BMI, menopausal status, diabetes, or time between infections.

Conclusions:

• The majority of sequential UTIs in women are caused by the same bacterial species, particularly in younger individuals.
• These findings support the hypothesis that persistent bacterial reservoirs may play a role in the pathogenesis of recurrent UTIs.