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Molecular Analysis of Carbapenem-Resistant Pseudomonas aeruginosa Isolated from Patients Hospitalized in Daejeon between 2008 and 2014 Years
Korean J Clin Lab Sci 2018;50:406-413  
Published on December 31, 2018
Copyright © 2018 Korean Society for Clinical Laboratory Science.

Hye Hyun Cho

Department of Biomedical Laboratory Science, Daejeon Institute of Science and Technology, Daejeon, Korea
Correspondence to: Hye Hyun Cho
Department of Biomedical Laboratory Science, Daejeon Institute of Science and Technology, 100 Hyechon-ro, Seo-gu, Daejeon 35408, Korea
Tel: 82-42-580-6341 Fax: 82-42-580-6301 E-mail:
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
The emergence of carbapenem resistance among Pseudomonas aeruginosa has become an increasing problem worldwide. In particular, metallo-β-lactamases (MBLs) are responsible for the high-level resistance to carbapenem. Sequence type 235 (ST235) has been found internationally in a multidrug-resistant clone and is involved in the dissemination of genes encoding IMP-6 and VIM-2. This study examined the prevalence of MBLs and the epidemiological relationship in carbapenem-resistant P. aeruginosa (CRPA) isolates obtained from a tertiary hospital in Daejeon, Korea, between March 2008 and June 2014. The antimicrobial susceptibilities were determined using the disk-diffusion method and PCR and DNA sequencing were used to identify the MBL genes. In addition, an epidemiological relationship was investigated by multilocus sequence typing (MLST). Among the 110 CRPA isolates, 32 isolates (29.1%) were MBL-producers; the major type was IMP-6 (29 isolates, 90.6%). VIM-2 was identified in 3 isolates (9.4%) of ST357. IMP-6-producing isolates were multidrug-resistant (MDR) and belonged to ST235. ST235 (55 isolates, 50.0%) was the clone most frequently detected and has gradually emerged during a seven-year period. To prevent the spread of MDR ST235 P. aeruginosa isolates, the current widespread use of carbapenems needs to be curtailed, and novel continuous monitoring strategies should be developed as soon as possible.
Keywords : CRPA, IMP-6, Multidrug-resistant, ST235, VIM-2

December 2018, 50 (4)
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