Abstract
Background
Community-acquired extended-spectrum beta-lactamase–producing Enterobacteriaceae (ESBL) infections are an evolving public health problem. Identifying predictive risk factors may improve patient management.
Methods
We identified 251 adult inpatients admitted to a 22-hospital system with an ESBL urinary tract infection (UTI) between 2001 and 2016. Cases were matched 1:1 with controls who had a UTI at admission with non-ESBL Enterobacteriaceae. Cases with a history of ESBL infections or hospitalization within 3 months of index admission were excluded. Univariate and multiple logistic regression were used to identify risk factors associated with ESBL UTIs.
Results
In univariate analysis, history of repeated UTIs, neurogenic bladder, urinary catheter presence at admission, and exposure to outpatient third-generation cephalosporins or fluoroquinolones within 3 months were associated with higher risk of ESBL UTIs. When controlling for severity of illness and comorbid conditions, history of repeated UTIs (adjusted odds ratio [aOR], 6.40; 95% confidence interval [CI], 3.42–12.66; P < .001), presence of urinary catheter at admission (aOR, 2.36; 95% CI, 1.15–4.98; P < .05), and prior antibiotic exposure (aOR, 7.98; 95% CI, 2.92–28.19; P < .001) remained associated with risk of ESBL infection.
Conclusions
Patients in the community with indwelling urinary catheters, history of recurrent UTIs, or recent antimicrobial use are at higher risk for de novo ESBL Enterobacteriaceae UTIs.
Urinary tract infections due to extended-spectrum beta-lactamase-producing Gram-negative bacteria: identification of risk factors and outcome predictors in an Australian tertiary referral hospital