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Updated: Feb 27, 2026
Detection of Horizontal Gene Transfer Mediated by Natural Conjugative Plasmids in E. coli
Published on: March 24, 2023
First environmental sample containing plasmid-mediated colistin-resistant ESBL-producing Escherichia coli detected in
Silje Bakken Jørgensen1,2, Arne Søraas1, Lotte Stenfors Arnesen3
1Department of Laboratory Medicine, Section for Medical Microbiology, Vestre Viken Hospital Trust, Baerum, Norway.
Abstract:
We hereby report the detection of the plasmid borne mcr-1 gene conferring colistin resistance in an extended-spectrum β-lactamase (ESBL) producing Escherichia coli ST10 strain retrieved from seawater at a public beach in Norway. The sample was collected in September 2010 and was investigated by whole-genome sequencing in 2016. This report illustrates that E. coli strains carrying plasmid-mediated colistin resistance genes have also reached areas where this drug is hardly used at all. Surveillance of colistin resistance in environmental, veterinary, and human strains is warranted also in countries where colistin resistance is rare in clinical settings.
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