Global emergence of a hypervirulent carbapenem-resistant Escherichia coli ST410 clone

Global emergence of a hypervirulent carbapenem-resistant Escherichia coli ST410 clone

12 January 2024 | Xiaoliang Ba, Yingyi Guo, Robert A. Moran, Emma L. Doughty, Baomo Liu, Likang Yao, Jiahui Li, Nanhao He, Siqian Shen, Yang Li, Willem van Schaik, Alan McNally, Mark A. Holmes, Chao Zhuo
Carbapenem-resistant *Escherichia coli* (CREC) ST410 has emerged as a significant global health concern. This study reports a shift in CREC prevalence in Chinese hospitals from 2017 to 2021, with ST410 becoming the most commonly isolated sequence type. Genomic analysis identifies a hypervirulent CREC ST410 clone, designated B5/H24RxC, which caused two separate outbreaks in a children's hospital. B5/H24RxC likely emerged from the previously characterized B4/H24RxC clone, which was first identified in 2006. B5/H24RxC lacks the *bla*OXA-181-bearing X3 plasmid but carries a F-type plasmid containing *bla*NDM-5. Most B5/H24RxC isolates also carry a high pathogenicity island and a novel O-antigen gene cluster. Comparative genomic analyses reveal that B5/H24RxC has a higher growth rate in vitro and is more virulent in vivo compared to B4/H24RxC. The identification of this newly emerged but already globally disseminated hypervirulent CREC clone highlights the ongoing evolution of ST410 towards increased resistance and virulence.Carbapenem-resistant *Escherichia coli* (CREC) ST410 has emerged as a significant global health concern. This study reports a shift in CREC prevalence in Chinese hospitals from 2017 to 2021, with ST410 becoming the most commonly isolated sequence type. Genomic analysis identifies a hypervirulent CREC ST410 clone, designated B5/H24RxC, which caused two separate outbreaks in a children's hospital. B5/H24RxC likely emerged from the previously characterized B4/H24RxC clone, which was first identified in 2006. B5/H24RxC lacks the *bla*OXA-181-bearing X3 plasmid but carries a F-type plasmid containing *bla*NDM-5. Most B5/H24RxC isolates also carry a high pathogenicity island and a novel O-antigen gene cluster. Comparative genomic analyses reveal that B5/H24RxC has a higher growth rate in vitro and is more virulent in vivo compared to B4/H24RxC. The identification of this newly emerged but already globally disseminated hypervirulent CREC clone highlights the ongoing evolution of ST410 towards increased resistance and virulence.
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[slides and audio] Global emergence of a hypervirulent carbapenem-resistant Escherichia coli ST410 clone