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Factors associated with vanA VRE acquisition in Cardiothoracic Surgery patients during an acute outbreak. | LitMetric
Background : There was an acute outbreak of vanA Enterococcus faecium (VREfm) in a tertiary Melbourne teaching hospital between 2015 and 2016 amongst Cardiothoracic Surgery (CTS) ward and Intensive Care Unit (ICU) patients. Prior to this outbreak vanB VRE had been the predominate genotype encountered.Methods : A retrospective, matched (1:2), case-control study was conducted on CTS patients between 1 August 2015 and 31 May 2016 admitted to a hospital in Melbourne, during an outbreak of vanA VREfm to identify factors associated with colonisation or infection. Factors assessed included undergoing surgery and type of procedure, exposure to antibiotics and admission to ICU.Results : During the outbreak, 56 new cases of vanA VREfm out of 802 CTS ward patients were identified. Of these new cases, 52 were included in the case-control analysis, all identified via rectal screening. Cases had significantly longer duration of stay in hospital (p < 0.001) than controls. Multivariable analysis identified exposure to ceftriaxone as an independent factor (OR 4.14, p = 0.018) associated with new vanA VREfm isolates. Other factors such as vancomycin exposure, specific CTS procedures or ICU admission were not identified as independent factors. Ceftriaxone was being used during the outbreak as surgical prophylaxis amongst CTS patients.Conclusion : Ceftriaxone use was associated with an increased risk of CTS patients acquiring vanA VREfm during an acute outbreak. This highlights the overall importance of antibiotic stewardship to minimise hospital-associated multi-drug resistant infections.
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