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BMC Infectious Diseases

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Open Access 01-12-2017 | Research article

Clonal replacement of epidemic KPC-producing Klebsiella pneumoniae in a hospital in China

Authors: Yuying Liang, Xiuyun Yin, Lijun Zeng, Shuiping Chen

Published in: BMC Infectious Diseases | Issue 1/2017

Abstract

Background

Klebsiella pneumoniae is a frequent nosocomial pathogen causing difficult-to-treat infections worldwide. The prevalence of Klebsiella pneumoniae carbapenemase (KPC)-producing Klebsiella pneumoniae (KPC-KP) is increasing in China. The aim of this study was to investigate the molecular epidemiology of KPC-KP in a nosocomial outbreak.

Methods

Fifty-four KPC-KP isolates were consecutively collected between November 2013 and August 2014 during a KPC-KP outbreak in a tertiary care hospital in Beijing, China. Antimicrobial susceptibility was determined by agar dilution. Carbapenemase, extended-spectrum β–lactamase, 16S rRNA methylase, AmpC β-lactamase, and plasmid-mediated quinolone resistance determinants were detected by PCR amplification. The genetic relatedness of isolates was analyzed by pulsed-field gel electrophoresis and multi-locus sequence typing.

Results

All isolates belonged to ST11 except one isolate which was identified as a new sequence type (ST2040). PFGE profile of genomic DNA revealed seven clusters, of which cluster A and C dominated the KPC-KP outbreak and cluster A was replaced by cluster C during the outbreak. PFGE of genomic DNA, S1-PFGE of plasmids, replicon typing, and drug resistant characteristics showed that clonal spread occurred during the outbreak. When compared with isolates within cluster A, all isolates in cluster C harbored rmtB and showed higher level of resistance to cefepime, amikacin, tobramycin, and tigecycline.

Conclusion

We reported a nosocomial outbreak of KPC-KP with clonal replacement and a new sequence type (ST2040) of KP. High degree of awareness and surveillance of KPC-KP should be given to avoid potential outbreaks, especially in ICU wards.

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Title: Clonal replacement of epidemic KPC-producing Klebsiella pneumoniae in a hospital in China
Authors: Yuying Liang
Xiuyun Yin
Lijun Zeng
Shuiping Chen
Publication date: 01-12-2017
Publisher: BioMed Central
Published in: BMC Infectious Diseases / Issue 1/2017
Electronic ISSN: 1471-2334
DOI: https://doi.org/10.1186/s12879-017-2467-9

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