Abstract
Extensively drug-resistant (XDR) bacteria are the main caues for causing clinical infectious diseases. Our aim was to distinguish the present molecular epidemiological situation of XDR Klebsiella pneumoniae, Acinetobacter baumannii, and Escherichia coli isolates recovered from local hospitals in Changzhou. Antibiotic susceptibility and phenotypic analysis, multilocus sequence typing and Pulsed Field Gel Electrophoresis were performed to trace these isolates. Resistant phenotype and gene analysis from 29 XDR strains demonstrated that they mainly included TEM, CTX-M-1/2, OXA-48, and KPC products. A. baumannii strains belonged to sequence type (ST) ST224, and carrying the blaCTX-M-2/TEM gene. The quinolone genes aac(6’)-ib-cr and qnrB were carrying only in A. baumannii and E.coli. Three (2.3%) of these strains were found to contain the blaNDM-1 or blaNDM-5 gene. A new genotype of K. pneumoniae was found as ST2639. Epidemic characteristics of the XDR clones showed that antibiotic resistance genes distributed unevenly in different wards in Changzhou’s local hospitals. With the sequencing of blaNDM carrying isolates, the plasmids often carrying a highly conservative Tn3-relavent mobile genetic element. The especially coupled insert sequence ISKox3 may be a distinctive resistance gene transfer loci. The genotypic diversity variation of XDRs suggested that tracking and isolating the sources of antibiotic resistance especially MBL-encoding genes such as blaNDM—will help manage the risk of infection by these XDRs.
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Funding
This study received financial support from the Key Laboratory Project of Changzhou City (CM20223016), Leading Talent of Changzhou “The 14th Five-Year Plan” High-Level Health Talents Training Project (2022CZLJ025), Top Talent of Changzhou “The 14th Five-Year Plan” High-Level Health Talents Training Project (2022CZBJ096), Changzhou health green seedling talent plan and Changzhou science and technology Foundation (CJ20210073,CJ20220237 and CJ20220158), Young Talent Project (CZQM2020113), Innovation project of Changzhou Medical Center (CMCB202217).
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Wang, J., Dong, X., Wang, F. et al. Molecular Characteristics and Genetic Analysis of Extensively Drug-Resistant Isolates with different Tn3 Mobile Genetic Elements. Curr Microbiol 80, 246 (2023). https://doi.org/10.1007/s00284-023-03340-x
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DOI: https://doi.org/10.1007/s00284-023-03340-x