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• W2345408993 abstract "ABSTRACT We report an outbreak of vancomycin-variable vanA + enterococci (VVE) able to escape phenotypic detection by current guidelines and demonstrate the molecular mechanisms for in vivo switching into vancomycin resistance and horizontal spread of the vanA cluster. Forty-eight vanA + Enterococcus faecium isolates and one Enterococcus faecalis isolate were analyzed for clonality with pulsed-field gel electrophoresis (PFGE), and their vanA gene cluster compositions were assessed by PCR and whole-genome sequencing of six isolates. The susceptible VVE strains were cultivated in brain heart infusion broth containing vancomycin at 8 μg/ml for in vitro development of resistant VVE. The transcription profiles of susceptible VVE and their resistant revertants were assessed using quantitative reverse transcription-PCR. Plasmid content was analyzed with S1 nuclease PFGE and hybridizations. Conjugative transfer of vanA was assessed by filter mating. The only genetic difference between the vanA clusters of susceptible and resistant VVE was an IS L3 -family element upstream of vanHAX , which silenced vanHAX gene transcription in susceptible VVE. Furthermore, the VVE had an insertion of IS 1542 between orf2 and vanR that attenuated the expression of vanHAX . Growth of susceptible VVE occurred after 24 to 72 h of exposure to vancomycin due to excision of the IS L3 -family element. The vanA gene cluster was located on a transferable broad-host-range plasmid also detected in outbreak isolates with different pulsotypes, including one E. faecalis isolate. Horizontally transferable silenced vanA able to escape detection and revert into resistance during vancomycin therapy represents a new challenge in the clinic. Genotypic testing of invasive vancomycin-susceptible enterococci by vanA -PCR is advised." @default.
• W2345408993 created "2016-06-24" @default.
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• W2345408993 date "2016-07-01" @default.
• W2345408993 modified "2023-09-24" @default.
• W2345408993 title "A Silenced <i>vanA</i> Gene Cluster on a Transferable Plasmid Caused an Outbreak of Vancomycin-Variable Enterococci" @default.
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• W2345408993 doi "https://doi.org/10.1128/aac.00286-16" @default.
• W2345408993 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4914660" @default.
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• W2345408993 hasPublicationYear "2016" @default.
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