Persistence of Vancomycin Resistance in Multiple Clones of Enterococcus faecium Isolated from Danish Broilers 15 Years after the Ban of Avoparcin

Valeria Bortolaia, Manuela Mander, Lars Bogø Jensen, John E. Olsen, Luca Guardabassi

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The occurrence and diversity of vancomycin-resistant Enterococcus faecium (VREF) were investigated in 100 Danish broiler flocks 15 years after the avoparcin ban. VREF occurred in 47 flocks at low fecal concentrations detectable only by selective enrichment. Vancomycin resistance was prevalently associated with a transferable nontypeable plasmid lineage occurring in multiple E. faecium clones. Coselection of sequence type 842 by tetracycline use only partly explained the persistence of vancomycin resistance in the absence of detectable plasmid coresistance and toxin-antitoxin systems.
Original languageEnglish
JournalAntimicrobial Agents and Chemotherapy
Volume59
Issue number5
Pages (from-to)2926-2929
Number of pages4
ISSN0066-4804
DOIs
Publication statusPublished - 2015

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