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Varying linezolid susceptibility of vancomycin-resistant Enterococcus faecium isolates during therapy: A case report

Journal of Antimicrobial Chemotherapy, ISSN: 0305-7453, Vol: 56, Issue: 4, Page: 787-789
2005
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Objectives: Linezolid is an oxazolidinone antibiotic used in the treatment of infections caused by vancomycin-resistant enterococci. Resistance to linezolid has been associated with a G2576U mutation in domain V of the 23S rRNA. Patient and methods: We present clinical details and susceptibility data from multiple Enterococcus faecium strains isolated from a liver transplant patient over 13 months. MICs of linezolid, vancomycin and quinupristin/dalfopristin were determined using Etest. Molecular typing was performed by pulsed-field gel electrophoresis. Domain V of the 23S rRNA gene in the vancomycin-resistant Enterococcus faecium was amplified. Linezolid concentrations were analysed by HPLC. Results: We report the emergence of resistance to linezolid in a vancomycin-resistant Enterococcus faecium during linezolid treatment. After discontinuation of the linezolid therapy, the isolate reverted to susceptibility. However, after re-administration of linezolid the vancomycin-resistant Enterococcus faecium became resistant to linezolid again. The isolates that were resistant to linezolid had a G2576T mutation in their 23S rDNA. Conclusion: We describe a clinical case that shows the shift of a vancomycin-resistant Enterococcus faecium from linezolid resistance to susceptibility and then back to resistance again related to linezolid therapy. © The Author 2005. Published by Oxford University Press on behalf of the British Society for Antimicrobial Chemotherapy. All rights reserved.

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