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Two cases of vancomycin-resistant Enterococcus faecium bacteremia with development of daptomycin-resistant phenotype and its detection using Oxford Nanopore sequencing


Date: 23rd May 2020 | Source: Open Forum Infectious Diseases

Authors: Zulema Udaondo, Piroon Jenjaroenpun, Thidathip Wongsurawat, Erik Meyers, Courtney Anderson, James Lopez, Meera Mohan, Ruslana Tytarenko, Brian Walker, David Ussery, Atul Kothari, Se-Ran Jun.

In this work, we report 2 cases of vancomycin-resistant Enterococcus faecium bacteremia with development of daptomycin resistance in 2 patients with acute myeloid leukemia and myelodysplastic syndrome. Mutations related to daptomycin-nonsusceptible phenotype in liaSR genes were found in all strains of the study, including those with a minimum inhibitory concentration <1 µg/mL collected before daptomycin therapy.

Epidemiological investigation using core genome single nucleotide polymorphism and core genome multilocus sequence typing revealed clonality of all the isolates. In this study, we conclude that real-time genome sequencing of clinical isolates can provide rapid access to timely information on daptomycin-resistant genotypes that would help clinicians speed up and optimize the selection of the antibiotic for treatment.

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