Sebastian Guenther1, Linda Falgenhauer2, Torsten Semmler3, Can Imirzalioglu2, Trinad Chakraborty2, Uwe Roesler1, Nicole Roschanski1. 1. Institute for Animal Hygiene and Environmental Health, Freie Universität Berlin, Robert-von-Ostertag-Str. 7-13, Berlin, 14163, Germany. 2. Justus Liebig University Giessen, Institute of Medical Microbiology, and German Center for Infection Research (DZIF), Partner Site Giessen-Marburg-Langen, Schubertstr. 81, Giessen, 35392, Germany. 3. Robert Koch Institute, Nordufer 20, Berlin, 13353, Germany.
Abstract
Objectives: Pigs have been the focus of the worldwide spread of colistin resistance. However, there is little information on the transmission of mcr-1 -containing bacteria into the environment of pig farms. We therefore rescreened environmental Escherichia coli isolates from the surrounding farm areas of three previously mcr-1 -positive swine herds in Germany. Methods: Thirty-five mixed bacterial cultures obtained from boot swabs, flies, dog faeces and manure from three pig farms in Germany in 2011-12 were non-selectively recultivated and the presence of the mcr-1 gene was checked by real-time PCR. After separation, single E. coli colonies were subsequently isolated and the presence of mcr-1 was confirmed by PCR and sequencing. In addition, phenotypic antimicrobial resistance screening and WGS followed by phylogenetic analysis and resistance genotyping as well as plasmid typing were performed. Results: Seven mcr-1 -positive E. coli strains originating from environmental boot swabs, dog faeces, stable flies and manure were found. The isolates belonged to five different STs (ST10, ST1011, ST1140, ST5281 and ST342) and harboured extensive additional resistance genes. Comparative plasmid analysis predominantly located mcr-1 on IncX4 plasmids, which are strongly related to a recently described plasmid of human clinical origin (pICBEC72Hmcr). Conclusions: WGS-based analysis of the environmental E. coli isolates of farm surroundings showed clear links to mcr-1 -harbouring E. coli recovered from pig production in Europe as well as from human clinical isolates worldwide, presenting another piece of the puzzle, which further complicates the rapidly evolving epidemiology of plasmid-mediated colistin-resistant E. coli strains.
Objectives:Pigs have been the focus of the worldwide spread of colistin resistance. However, there is little information on the transmission of mcr-1 -containing bacteria into the environment of pig farms. We therefore rescreened environmental Escherichia coli isolates from the surrounding farm areas of three previously mcr-1 -positive swine herds in Germany. Methods: Thirty-five mixed bacterial cultures obtained from boot swabs, flies, dog faeces and manure from three pig farms in Germany in 2011-12 were non-selectively recultivated and the presence of the mcr-1 gene was checked by real-time PCR. After separation, single E. coli colonies were subsequently isolated and the presence of mcr-1 was confirmed by PCR and sequencing. In addition, phenotypic antimicrobial resistance screening and WGS followed by phylogenetic analysis and resistance genotyping as well as plasmid typing were performed. Results: Seven mcr-1 -positive E. coli strains originating from environmental boot swabs, dog faeces, stable flies and manure were found. The isolates belonged to five different STs (ST10, ST1011, ST1140, ST5281 and ST342) and harboured extensive additional resistance genes. Comparative plasmid analysis predominantly located mcr-1 on IncX4 plasmids, which are strongly related to a recently described plasmid of human clinical origin (pICBEC72Hmcr). Conclusions: WGS-based analysis of the environmental E. coli isolates of farm surroundings showed clear links to mcr-1 -harbouring E. coli recovered from pig production in Europe as well as from human clinical isolates worldwide, presenting another piece of the puzzle, which further complicates the rapidly evolving epidemiology of plasmid-mediated colistin-resistant E. coli strains.
Authors: Daniel Farias Monte; Andressa Mem; Miriam R Fernandes; Louise Cerdeira; Fernanda Esposito; Julia A Galvão; Bernadette D G M Franco; Nilton Lincopan; Mariza Landgraf Journal: Antimicrob Agents Chemother Date: 2017-04-24 Impact factor: 5.191
Authors: Hassan Tarabai; Adam Valcek; Ivana Jamborova; Sergey V Vazhov; Igor V Karyakin; Rainer Raab; Ivan Literak; Monika Dolejska Journal: Antimicrob Agents Chemother Date: 2019-08-23 Impact factor: 5.191
Authors: Konstantinos Koutsoumanis; Ana Allende; Avelino Álvarez-Ordóñez; Declan Bolton; Sara Bover-Cid; Marianne Chemaly; Robert Davies; Alessandra De Cesare; Lieve Herman; Friederike Hilbert; Roland Lindqvist; Maarten Nauta; Giuseppe Ru; Marion Simmons; Panagiotis Skandamis; Elisabetta Suffredini; Héctor Argüello; Thomas Berendonk; Lina Maria Cavaco; William Gaze; Heike Schmitt; Ed Topp; Beatriz Guerra; Ernesto Liébana; Pietro Stella; Luisa Peixe Journal: EFSA J Date: 2021-06-17