Coexistence of blaNDM-1, mcr-1 and blaCTX-M-199 in an ST499 multidrug resistant Klebsiella pneumoniae Isolate
Year: 2025
Type: article
Abstract: The coexistence of multiple resistance genes within a single bacterial strain presents a significant public health challenge, as it complicates treatment options and accelerates the spread of multidrug resistance. While the co-occurrence of bla NDM-1 and mcr-1 genes in Klebsiella pneumoniae (KP) is uncommon, this study reports the biological characterization of a K. pneumoniae isolate, L5151, derived from a patient with diarrhea. This strain carries bla NDM-1 , mcr-1 , and bla CTX-M-199 resistance genes simultaneously. Multilocus sequence typing (MLST) analysis identified the L5151 strain as an ST499 type. Antimicrobial susceptibility testing (AST) was conducted via agar dilution and the broth microdilution procedure. The AST results revealed that L5151 is resistant to a variety of antibiotics. Whole-genome sequencing (WGS) and bioinformatics analysis were performed to determine the genetic composition of the strain, including the presence and characteristics of resistance genes. The results of S1 nuclease-pulsed field gel electrophoresis (S1-PFGE) and Southern blotting confirmed that the L5151 strain harbors three plasmids and that the plasmid carrying mcr-1 (pL5151_MCR_CTX) is of the IncI2(Delta) type, whereas the plasmid carrying bla NDM-1 (pL5151_NDM) is of the IncN type. The combination of these plasmids in recipient strains conferred enhanced resistance to carbapenems and colistin, highlighting the potential for increased treatment challenges. This study emphasizes the importance of ongoing surveillance of multidrug-resistant strains to prevent their spread and outbreaks. These findings provide critical insights for clinical treatment strategies and infection prevention and control measures. Enhanced surveillance and targeted interventions are essential to manage the public health risks posed by multidrug-resistant strains.
Source: Scientific Reports
Authors: Xinjun Hu, Bingyou Yin, Ruishan Liu, Lu Gong, Xiaolu Yang, Zhenghao Lou, Haowei Ye, Bingyang Shang, Yibing Shang, Yingjian Zhang
Institutions: Henan University of Science and Technology, First Affiliated Hospital of Henan University of Science and Technology, First Affiliated Hospital Zhejiang University, State Key Laboratory of Diagnosis and Treatment of Infectious Diseases, Zhejiang University, Zhejiang Chinese Medical University
Language: English
Subfield: Molecular Medicine
Domain: Life Sciences
Open Access status: gold
Estimated APC paid: $2,690
OpenAlex ID: W4410922192