Characterize carbapenem-resistant Klebsiella pneumoniae isolates for nosocomial pneumonia and their Gram-negative bacteria neighbors in the respiratory tract.

Abstract

This study was conducted to perform an epidemiological survey of carbapenem-resistant Klebsiella pneumoniae (CRKP) isolates for nosocomial pneumonia (NP) and visit their Gram-negative bacteria neighbors (GNNs) from the respiratory tracts. Pulsed-field gel electrophoresis and multi locus sequence typing were performed to evaluate the clonal relationships of these isolates. Statistical methods were then used to understand their possible relationship between CRKP and their GNNs. Among the 63 CRKP isolates, 84.1% produced a KPC-2 carbapenemase gene, followed by blaNDM-1 and blaIMP-38 like. 13 different STs and 29 clones were identified. Less heterogeneous clone backgrounds were observed in 53 KPC-2 K. pneumoniae isolates, and 6 STs have been found to contain KPC-2, of which the predominant ST11 harbored 47 KPC-2-producing K. pneumoniae isolates. Particularly, the two infrequent isolates co-possessing blaKPC-2 and blaIMP-38 like shared a different clonal relationship. 87 GNNs isolates of CRKP were established, the analysis present that different strains showed significant or no difference with CRKP upon antibiotics susceptibility. Conclusion, ST11 harboring KPC-2-producing K. pneumoniae isolates were dominant for NP, and both clonal spread and horizontal transfer contributed to the dissemination of CRKP. However, additional studies are needed to explore the biological relationship with their GNNs.

• Authors: Dongmei Zhao, Yan Zuo, Zhongxin Wang, Jiabin Li
• Journal: Molecular biology reports (Mol Biol Rep) Vol. 46 Issue 1 Pg. 609-616 (Feb 2019) ISSN: 1573-4978 [Electronic] Netherlands
• PMID: 30603949 (Publication Type: Journal Article)

Chemical References

• Anti-Bacterial Agents
• Carbapenems
• DNA, Bacterial

Topics

• Anti-Bacterial Agents (pharmacology)
• Carbapenem-Resistant Enterobacteriaceae (genetics)
• Carbapenems (pharmacology)
• China
• Cross Infection
• DNA, Bacterial (genetics)
• Drug Resistance, Bacterial (genetics, physiology)
• Drug Resistance, Multiple, Bacterial (genetics)
• Electrophoresis, Gel, Pulsed-Field (methods)
• Gram-Negative Bacteria (drug effects)
• Humans
• Klebsiella pneumoniae (isolation & purification, pathogenicity, physiology)
• Microbial Sensitivity Tests
• Molecular Epidemiology (methods)
• Pneumonia
• Respiratory System (microbiology)
• Retrospective Studies