Prevalence and molecular epidemiology characteristics of carbapenem-resistant Escherichia coli in Heilongjiang Province, China

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2019
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Abstract
Prevalence and molecular epidemiology characteristics of carbapenem-resistant Escherichia coli in Heilongjiang Province, China Ping Cheng,1 Fulei Li,1 Ruimeng Liu,1 Yuqi Yang,1 Tianshi Xiao,1 Muhammad Ishfaq,1 Guofeng Xu,2 Xiuying Zhang11Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development, Faculty of Basic Veterinary Science, College of Veterinary Medicine, Northeast Agricultural University, Harbin, Heilongjiang 150030, People’s Republic of China; 2First Department of Respiratory Disease, Inflammation and Allergic Diseases Research Unit, Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, People’s Republic of ChinaObjective: This retrospective study was conducted to determine the prevalence and molecular epidemiology characteristics of carbapenem-resistant Escherichia coli (CRE).Methods: A total of 593 Escherichia coli (E. coli) isolates were recovered from pigs and urban river from 2009 to 2014 in Heilongjiang Province of China. Forty CRE including 22 strains isolated from fecal samples of pigs and 18 strains isolated from water samples were selected. PCR detection of resistance determinants, multi-locus sequence typing (MLST), pulsed-field gel electrophoresis (PFGE), and phylogenetic groups were performed to characterize CRE isolates. Conjugation experiments, plasmid stability testing, PCR-based replicon typing (PBRT), and PCR mapping were conducted to analyze blaNDM-carrying plasmids. In vitro time–growth studies and competition experiments were carried out to assess the fitness impact of NDM carriage.Results: Five NDM-1-positive E. coli isolates were identified from water samples. Genetic environment analysis revealed that a cluster of genes (ISAba125-blaNDM-1-bleMBL-ΔtrpF) was detected in all of the NDM-1-positive isolates. Conjugation assays showed that blaNDM-1 could be successfully transferred to E. coli J53 from 5 donor strains at frequencies of 4.6×10−5 to 2.6×10−2. The plasmids from all transconjugants belonged to different plasmid replicon types including IncA/C (n
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Authors Ping Cheng;Fulei Li;Ruimeng Liu;Yuqi Yang;Tianshi Xiao;Muhammad Ishfaq;Guofeng Xu;Xiuying Zhang and
Journal Infection and drug resistance
Year 2019
DOI
10.2147/IDR.S208122
URL
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