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Authors: Shi, Lining and Feng, Jiao and Zhan, Zhe and Zhao, Yuzong and Zhou, Haijian and Mao, Haifeng and Gao, Yingjie and Zhang, Ying and Yin, Zhe and Gao, Bo and Tong, Yigang and Luo, Yanping and Zhang, Defu and Zhou, Dongsheng

We recently reported the complete sequence of a blaKPC-2- and rmtB-carrying IncFII-family plasmid p675920-1 with the pKPC-LK30/pHN7A8 hybrid structure. Comparative genomics of additional sequenced plasmids with similar hybrid structures and their prevalence in blaKPC-carrying Klebsiella pneumoniae strains from China were investigated in this follow-up study.A total of 51 blaKPC-carrying K. pneumoniae strains were isolated from 2012 to 2016 from five Chinese hospitals and genotyped by multilocus sequence typing. The blaKPC-carrying plasmids from four representative strains were sequenced and compared with p675920-1 and pCT-KPC. Plasmid transfer, carbapenemase activity determination, and bacterial antimicrobial susceptibility test were performed to characterize resistance phenotypes mediated by these plasmids. The prevalence of pCT-KPC-like plasmids in these blaKPC-carrying K. pneumoniae strains was screened by PCR.The six KPC-encoding plasmids p1068-KPC, p20049-KPC, p12139-KPC and p64917-KPC (sequenced in this study) and p675920-1 and pCT-KPC slightly differed from one another due to deletion and acquisition of various backbone and accessory regions. Two major accessory resistance regions, which included the blaKPC-2 region harboring blaKPC-2 (carbapenem resistance) and blaSHV-12 (ß-lactam resistance), and the MDR region carrying rmtB (aminoglycoside resistance), fosA3 (fosfomycin resistance), blaTEM-1B (ß-lactam resistance) and blaCTX-M-65 (ß-lactam resistance), were found in each of these six plasmids and exhibited several parallel evolution routes. The pCT-KPC-like plasmids were present in all the 51 K. pneumoniae isolates, all of which belonged to CG258.There was clonal dissemination of K. pneumoniae CG258 strains, harboring blaKPC-2- and rmtB-carrying IncFII-family pKPC-LK30/pHN7A8 hybrid plasmids, among multiple Chinese hospitals.

Journal: Infection and drug resistance
DOI: 10.2147/IDR.S171953
Year: 2018

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