Novel Carbapenem-Resistant Klebsiella pneumoniae ST147 Coharboring blaNDM-1, blaOXA-48 and Extended-Spectrum β-Lactamases from Pakistan
Received 27 February 2020
Accepted for publication 7 May 2020
Published 2 July 2020 Volume 2020:13 Pages 2105—2115
Checked for plagiarism Yes
Review by Single anonymous peer review
Peer reviewer comments 2
Editor who approved publication: Dr Sahil Khanna
Aamir Jamal Gondal,1,2 Sidrah Saleem,1 Shah Jahan,3 Nakhshab Choudhry,4 Nighat Yasmin2
1Department of Microbiology, University of Health Sciences, Lahore, Pakistan; 2Department of Biomedical Sciences, King Edward Medical University, Lahore, Pakistan; 3Department of Immunology, University of Health Sciences, Lahore, Pakistan; 4Department of Biochemistry, King Edward Medical University, Lahore, Pakistan
Correspondence: Aamir Jamal Gondal
Department of Biomedical Sciences, King Edward Medical University, Nelagumbad Chowk, Anarkali Bazar, Lahore 54000, Pakistan
Purpose: The emergence of multidrug-resistant Klebsiella pneumoniae (K. pneumoniae) is associated with the acquisition of multiple carbapenemases. Their clonal spread is a worldwide concern due to their critical role in nosocomial infections. Therefore, the identification of high-risk clones with antibiotic resistance genes is very crucial for controlling its global spread.
Materials and Methods: A total of 227 K. pneumoniae strains collected during April 2018 to November 2019 were confirmed by PCR. Carbapenemases and extended-spectrum β-lactamases (ESBL) were detected phenotypically. Confirmation of carbapenemases was carried out by PCR and Sanger sequencing. The clonal lineages were assigned to selected isolates by multilocus sequence typing (MLST), and the plasmid analysis was done by PCR-based detection of the plasmid replicon typing.
Results: Of the total K. pneumoniae, 117 (51.5%) were carbapenem resistant (CRKP) and 140 (61.7%) were identified as ESBL producers. Intermediate to high resistance was detected in the tested β-lactam drugs while polymyxin-B and tigecycline were found to be susceptible. Among CRKP, 91 (77.8%) isolates were detected as carbapenemase producing, while 55 (47%) were positive for blaNDM-1 23.9% (n=28), blaOXA-48 22.2% (n=26) and blaVIM 0.85% (n=1) while 12.7% (n=7) carried both blaNDM-1 and blaOXA-48 genes. The CRKP coharboring blaNDM-1 and blaOXA-48 genes (n=7) were positive for blaCTX-M blaSHV (n=3), blaSHV (n=1) and blaCTX-M (n=3). The novel CRKP with the coexistence of blaNDM-1, blaOXA-48, blaCTX-M and blaSHV genes were associated with the high-risk clone ST147 (n=5) and ST11 (n=2). The assigned replicon types were IncL/M, IncFII, IncA/C and IncH1.
Conclusion: This is the first report of the coexistence of blaNDM-1, blaOXA-48, blaCTX-M and blaSHV genes on a high-risk lineage ST147 from Pakistan. This study highlights the successful dissemination of carbapenemase resistance genes in the high-risk clones that emphasizes the importance of monitoring and controlling the spread of these diverse clones globally.
Keywords: high-risk clone, New Delhi metallo-β-lactamase, MLST, K. pneumoniae, carbapenem resistance
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