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Carbapenem-Resistant Enterobacter hormaechei ST1103 with IMP-26 Carbapenemase and ESBL Gene blaSHV-178

Authors Gou JJ, Liu N, Guo LH, Xu H, Lv T, Yu X, Chen YB, Guo XB, Rao YT, Zheng BW

Received 26 September 2019

Accepted for publication 30 January 2020

Published 20 February 2020 Volume 2020:13 Pages 597—605


Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 3

Editor who approved publication: Professor Suresh Antony

Jian-Jun Gou,1,* Na Liu,1,2,* Li-Hua Guo,2 Hao Xu,2 Tao Lv,2 Xiao Yu,2 Yun-Bo Chen,2 Xiao-Bing Guo,1 Yu-Ting Rao,1 Bei-Wen Zheng2

1Department of Laboratory Medicine, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, People’s Republic of China; 2Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, People’s Republic of China

*These authors contributed equally to this work

Correspondence: Jian-Jun Gou; Bei-Wen Zheng
Tel +86 371 6627 8237; +86 571 8723 6423
Fax +86 371 6691 3569; +86 571 8723 6421

Purpose: To investigate the occurrence and genetic characteristics of the blaIMP-26-positive plasmid from a multidrug-resistant clinical isolate, Enterobacter hormaechei L51.
Methods: Species identification was determined by MALDI-TOF MS and Sanger sequencing. Antimicrobial susceptibility testing was performed by the agar dilution and broth microdilution. Whole-genome sequencing was conducted using Illumina HiSeq 4000-PE150 and PacBio Sequel platforms, and the genome was annotated by the RAST annotation server. The ANI analysis of genomes was performed using OAT. Phylogenetic reconstruction and analyses were performed using the Harvest suite based on the core-genome SNPs of 61 publicly available E. hormaechei genomes.
Results: The E. hormaechei L51 genome consists of a 5,018,729 bp circular chromosome and a 343,918 bp conjugative IncHI2/2A plasmid pEHZJ1 encoding blaIMP-26 which surrounding genetic context was intI1-blaIMP-26-ltrA-qacE∆1-sul1. A new sequence type (ST1103) was assigned for the isolate L51 which was resistant to cephalosporins, carbapenems, but sensitive to piperacillin-tazobactam, amikacin, tigecycline, trimethoprim-sulfamethoxazole and colistin. Phylogenetic analysis demonstrated that E. hormaechei L51 belonged to the same subspecies as the reference strain E. hormaechei SCEH020042, however 18,248 divergent SNP were identified. Resistance genes in pEHZJ1 including aac(3)-IIc, aac(6ʹ)-IIc, blaSHV-178, blaDHA-1, blaTEM-1, blaIMP-26, ereA2, catII, fosA5, qnrB4, tet(D), sul1 and dfrA19.
Conclusion: In our study, we identified a conjugative IncHI2/2A plasmid carrying blaIMP-26 and blaSHV-178 in E. hormaechei ST1103, a novel multidrug-resistant strain isolated from China, and describe the underlying resistance mechanisms of the strain and detailed genetic context of mega plasmid pEHZJ1.

Keywords: Enterobacter hormaechei, multidrug-resistant, blaIMP-26, IncHI2/2A, genomics

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