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Changes in bacterial epidemiology and antibiotic resistance among veterans with spinal cord injury/disorder over the past 9 years.

Fitzpatrick MA, Suda KJ, Safdar N, Burns SP, Jones MM, Poggensee L, Ramanathan S, Evans CT. Changes in bacterial epidemiology and antibiotic resistance among veterans with spinal cord injury/disorder over the past 9 years. The journal of spinal cord medicine. 2018 Mar 1; 41(2):199-207.

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OBJECTIVE: Patients with spinal cord injury and disorder (SCI/D) have an increased risk of infection with multidrug-resistant (MDR) bacteria. We described bacterial epidemiology and resistance in patients with SCI/D at Veterans Affairs Medical Centers (VAMCs) for the past 9 years. DESIGN: Retrospective cohort. SETTING: One hundred thirty VAMCs. PARTICIPANTS: Veterans with SCI/D and bacterial cultures with antibiotic susceptibility testing performed between 1/1/2005-12/31/2013. Single cultures with contaminants and duplicate isolates within 30 days of initial isolates were excluded. INTERVENTIONS: None. OUTCOMES: Trends in microbial epidemiology and antibiotic resistance. RESULTS: Included were 216,504 isolates from 19,421 patients. Urine was the most common source and Gram-negative bacteria (GNB) were isolated most often, with 36.1% of GNB being MDR. Logistic regression models clustered by patient and adjusted for location at an SCI/D center and geographic region showed increased odds over time of vancomycin resistance in Enterococcus [adjusted odds ratio (aOR) 1.67, 95% confidence interval (CI) 1.30-2.15], while methicillin resistance in Staphylococcus aureus remained unchanged (aOR 0.90, 95% CI 0.74-1.09). There were also increased odds of fluoroquinolone resistance (aOR 1.39, 95% CI 1.31-1.47) and multidrug resistance (aOR 1.46, 95% CI 1.38-1.55) in GNB, with variability in the odds of MDR bacteria by geographic region. CONCLUSIONS: GNB are isolated frequently in Veterans with SCI/D and have demonstrated increasing resistance over the past 9 years. Priority should be given to controlling the spread of resistant bacteria in this population. Knowledge of local and regional epidemiologic trends in antibiotic resistance in patients with SCI/D may improve appropriate antibiotic prescribing.

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