<abstract xmlns="http://www.w3.org/1999/xhtml"><p>Carbapenem-resistant <italic>Klebsiella pneumoniae</italic> (CRKP) isolates often cause nosocomial infections with limited therapeutic options and spread rapidly worldwide. In this study, we revealed a polyclonal emergence of CRKP isolates from the intensive care unit in a Chinese tertiary hospital. We applied a series of methods including automated screening, antimicrobial susceptibility testing, the modified carbapenem inacti vation method (mCIM), PCR amplification, DNA sequencing, and multilocus sequence typing (MLST) to characterize 30 non-duplicated CRKP isolates along with the collection of the related medical records. The results showed the polyclonal spread of CRKP isolates belonged to ST722, ST1446, ST111, ST896, ST290, and ST11. Among them, ST722 and ST1446 were two novel types of <italic>K. pneumoniae</italic>, and ST896 isolate harboring <italic>bla</italic><sub>KPC-2</sub> was also found for the first time. Since the polyclonal spread of CRKP in the same ward is rare, the silent clonal evolution with the switching genotypes prompts us to stay alert for outbreaks caused by novel subclones.</p></abstract>

Carbapenem-resistant Klebsiella pneumoniae (CRKP) isolates often cause nosocomial infections with limited therapeutic options and spread rapidly worldwide. In this study, we revealed a polyclonal emergence of CRKP isolates from the intensive care unit in a Chinese tertiary hospital. We applied a series of methods including automated screening, antimicrobial susceptibility testing, the modified carbapenem inacti vation method (mCIM), PCR amplification, DNA sequencing, and multilocus sequence typing (MLST) to characterize 30 non-duplicated CRKP isolates along with the collection of the related medical records. The results showed the polyclonal spread of CRKP isolates belonged to ST722, ST1446, ST111, ST896, ST290, and ST11. Among them, ST722 and ST1446 were two novel types of K. pneumoniae, and ST896 isolate harboring blaKPC-2 was also found for the first time. Since the polyclonal spread of CRKP in the same ward is rare, the silent clonal evolution with the switching genotypes prompts us to stay alert for outbreaks caused by novel subclones.

A Polyclonal Spread Emerged: Characteristics of Carbapenem-Resistant <italic>Klebsiella pneumoniae</italic> Isolates from the Intensive Care Unit in a Chinese Tertiary Hospital

Polish Journal of Microbiology

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A Polyclonal Spread Emerged: Characteristics of Carbapenem-Resistant  Isolates from the Intensive Care Unit in a Chinese Tertiary Hospital

Carbapenem-resistant Klebsiella pneumoniae (CRKP) isolates often cause nosocomial infections with limited therapeutic options and spread rapidly worldwide. In...

A Polyclonal Spread Emerged: Characteristics of Carbapenem-Resistant Klebsiella pneumoniae Isolates from the Intensive Care Unit in a Chinese Tertiary Hospital

Article Category: original-paper

Published Online: Sep 08, 2020

Page range: 311 - 319

Received: Mar 31, 2020

Accepted: Jul 22, 2020

DOI: https://doi.org/10.33073/pjm-2020-034

Keywords
polyclonal spread, carbapenem-resistant, sequence type, intensive care unit, alert

© 2020 Zhengzheng Wang et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

A Polyclonal Spread Emerged: Characteristics of Carbapenem-Resistant Klebsiella pneumoniae Isolates from the Intensive Care Unit in a Chinese Tertiary Hospital

Article Category: original-paper

Published Online: Sep 08, 2020

Page range: 311 - 319

Received: Mar 31, 2020

Accepted: Jul 22, 2020

DOI: https://doi.org/10.33073/pjm-2020-034

Keywordspolyclonal spread, carbapenem-resistant, sequence type, intensive care unit, alert

© 2020 Zhengzheng Wang et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Keywords
polyclonal spread, carbapenem-resistant, sequence type, intensive care unit, alert