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Tuesday, April 21, 2020

IncC blaKPC-2-positive plasmid characterized from ST648 Escherichia coli.

This study describes the characterization of type 2 IncC plasmids pC-Ec20-KPC and pC-Ec2-KPC, carrying blaKPC-2 gene, from two multiresistant E. coli recovered in the University Hospital of Larissa, in 2018.Escherichia coli, Ec-2Lar and Ec-20Lar, were recovered from rectal swabs from two patients, during the monthly surveillance cultures. Transfer experiments by conjugation were carried out with E. coli recipients. blaKPC-carrying plasmids were characterized by S1 profiling. Isolates were typed by MLST. Whole bacterial genome was sequenced using the Sequel platform.Both E. coli isolates, belonging to ST648, transferred the blaKPC-2 to E. coli A15 laboratory strain by conjugation. Plasmid analysis revealed that…

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Tuesday, April 21, 2020

Increased prevalence of Escherichia coli strains from food carrying blaNDM and mcr-1-bearing plasmids that structurally resemble those of clinical strains, China, 2015 to 2017.

Introduction: Emergence of resistance determinants of blaNDM and mcr-1 has undermined the antimicrobial effectiveness of the last line drugs carbapenems and colistin. Aim: This work aimed to assess the prevalence of blaNDM and mcr-1 in E. coli strains collected from food in Shenzhen, China, during the period 2015 to 2017. Methods: Multidrug-resistant E. coli strains were isolated from food samples. Plasmids encoding mcr-1 or blaNDM genes were characterised and compared with plasmids found in clinical isolates.ResultsAmong 1,166 non-repeated cephalosporin-resistant E. coli strains isolated from 2,147 food samples, 390 and 42, respectively, were resistant to colistin and meropenem, with five strains…

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Tuesday, April 21, 2020

Diverse Vectors and Mechanisms Spread New Delhi Metallo-ß-Lactamases among Carbapenem-Resistant Enterobacteriaceae in the Greater Boston Area.

New Delhi metallo-beta-lactamases (NDMs) are an uncommon but emerging cause of carbapenem resistance in the United States. Genomic factors promoting their domestic spread remain poorly characterized. A prospective genomic surveillance program among Boston-area hospitals identified multiple new occurrences of NDM-carrying strains of Escherichia coli and Enterobacter cloacae complex in inpatient and outpatient settings, representing the first occurrences of NDM-mediated resistance since initiating genomic surveillance in 2011. Cases included domestic patients with no international exposures. PacBio sequencing of isolates identified strain characteristics, resistance genes, and the complement of mobile vectors mediating spread. Analyses revealed a common 3,114-bp region containing the blaNDM…

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Tuesday, April 21, 2020

Characterization of NDM-5- and CTX-M-55-coproducing Escherichia coli GSH8M-2 isolated from the effluent of a wastewater treatment plant in Tokyo Bay.

New Delhi metallo-ß-lactamase (NDM)-5-producing Enterobacteriaceae have been detected in rivers, sewage, and effluents from wastewater treatment plants (WWTPs). Environmental contamination due to discharged effluents is of particular concern as NDM variants may be released into waterways, thereby posing a risk to humans. In this study, we collected effluent samples from a WWTP discharged into a canal in Tokyo Bay, Japan.Testing included the complete genome sequencing of Escherichia coli GSH8M-2 isolated from the effluent as well as a gene network analysis.The complete genome sequencing of GSH8M-2 revealed that it was an NDM-5-producing E. coli strain sequence type ST542, which carries multiple…

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Tuesday, April 21, 2020

Characterization of an NDM-5 carbapenemase-producing Escherichia coli ST156 isolate from a poultry farm in Zhejiang, China.

The emergence of carbapenem-resistant Enterobacteriaceae strains has posed a severe threat to public health in recent years. The mobile elements carrying the New Delhi metallo-ß-lactqtamase (NDM) gene have been regarded as the major mechanism leading to the rapid increase of carbapenem-resistant Enterobacteriaceae strains isolated from clinics and animals.We describe an NDM-5-producing Escherichia coli strain, ECCRA-119 (sequence type 156 [ST156]), isolated from a poultry farm in Zhejiang, China. ECCRA-119 is a multidrug-resistant (MDR) isolate that exhibited resistance to 27 antimicrobial compounds, including imipenem and meropenem, as detected by antimicrobial susceptibility testing (AST). The complete genome sequence of the ECCRA-119 isolate was…

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