ArticlePloS one2020
Molecular characterization of blaKHM-1 encoding plasmid in an Enterobacter hormaechei subsp. hoffmannii isolate from blood culture.
Article in PloS one, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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5 citing papers in PubMed, 15 citations in OpenAlex.
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- Genetic Diversity, Biochemical Properties, and Detection Methods of Minor Carbapenemases in Enterobacterales.Frontiers in medicine · 2020Review
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Authors and funding
8 authors at 2 institutions in 1 country.
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No grant is acknowledged in the PubMed record.
Abstract
KHM-1 was first reported in 1997 in Japan as a novel metallo-β-lactamase mediated by Citrobacter freundii carrying pKHM-1 plasmid. There have been few reports in the clinical field since then. A blaKHM-1-positive Enterobacter hormaechei subsp. hoffmannii in E. cloacae complex, isolate OIPH-N069 was isolated from an inpatient blood culture in 2016. The isolate was characterized by whole-genome sequencing, comparative analysis of the blaKHM-1 encoding plasmid, antimicrobial susceptibility tests, and bacterial conjugation. OIPH-N069 was classified into ST78 of E. cloacae complex, and was multidrug resistant because of the presence of antimicrobial resistance genes in addition to blaKHM-1 on its chromosome and plasmids. blaKHM-1 was located on 136,816 bp of the IncA/C2 plasmid pN069-1, which could be transferred to different bacterial species. The backbone structure, genetic arrangement of the class 1 integron cassette, and the blaKHM-1 gene located downstream of the IncA/C2 antibiotic resistance island, ARI-A, in pN069-1 and pKHM-1 were identical. Horizontal gene transfer of the blaCTX-M-2-ISEcp1 resistance gene module only occurred with pN069-1. The study findings indicate not only the structural conservation of blaKHM-1 encoding plasmids over time and across species, but also the risk of the spread of blaKHM-1 encoding plasmids to other bacterial species and the accumulation of additional resistance genes.
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