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Molecular Epidemiology of Carbapenem-Resistant Escherichia Coli and Klebsiella Pneumoniae: (English)

Molecular Epidemiology of Carbapenem-Resistant Escherichia Coli and Klebsiella Pneumoniae: (English)

          
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About the Book

This dissertation, "Molecular Epidemiology of Carbapenem-resistant Escherichia Coli and Klebsiella Pneumoniae" by Yuk-yam, Cheung, 張煜鑫, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Increasing carbapenem resistance among clinical isolates of E. coli and K. pneumoniae has become a serious public health problem over the last decade. Molecular epidemiology studies have shown that there is a global dissemination of epidemic clones of carbapenem-resistant E. coli and K. pneumoniae. Besides, successful epidemic plasmids were reported to disseminate carbapenemase genes in Enterobacteriaceae. The wide spread of carbapenem-resistant E. coli and K. pneumoniae limits treatment options of the infection, poses severe challenges to clinical professionals and threatens our health. Recently, carbapenem-resistant E. coli and K. pneumoniae are increasingly reported in Hong Kong. In 2012, our group has documented the emergence of carbapenem-resistant clinical isolates in Hong Kong. The findings of the previous study showed that 26.1% of the Enterobacteriaceae isolates were confirmed to produce carbapenemase. Notably, a novel IncX3 plasmid was found to be involved in the dissemination of blaNDM-1 gene. However, the previous findings fail to explicate the carbapenem resistance mechanisms of the remaining non-carbapenemase producing isolates. Further investigation is needed to elucidate the situation. Firstly, we investigated the carbapenem resistance mechanism of carbapenem-resistant E. coli and K. pneumoniae isolates recovered from the Hong Kong West Cluster hospitals from 2010 to 2012. PCRs were used to detect carbapenemase genes (blaNDM, blaKPC, blaIMP, blaVIM and blaOXA-48), blaCTX-M ESBL genes and blaAmpC genes. SDS-PAGE was used to detect porin loss. Among the 92 isolates in this study, only nine (9.8 %) isolates were detected with carbapenemase genes. The blaCTX-M and/or blaAmpC β-lactamase genes plus porin loss were detected in 47 non-carbapenemase-producing isolates (16 E. coli and 31 K. pneumoniae). The resistance determinant profiles of these 16 E. coli included: blaCTX-M + porin loss (n= 10), blaCIT + porin loss (n = 1), blaCTX-M + blaCIT/DHA + porin loss (n = 5). The resistance determinant profiles of the 31 K. pneumoniae included: blaCTX-M + porin loss (n= 4), blaDHA + porin loss (n = 7), blaCTX-M + blaCIT/DHA + porin loss (n = 20). The results showed that apart from acquired carbapenemases, the production of AmpC β-lactamase and/or ESBLs plus porin loss played a main role in the carbapenem resistance mechanism of the carbapenem-resistant E. coli and K. pneumoniae isolates. Secondly, we accessed the clonal relatedness of the isolates. Multi-locus sequence typing results showed that 55 (77.5%) K. pneumoniae isolates fall into the clonal complex 37. Our results suggest that the CC37 K. pneumoniae are associated with the acquisition of DHA-1 β-lactamase, CTXM-1-group β-lactamase and porin alterations which could confer a high-level of resistance to carbapenems resulting in their predominance in this study. Finally, we characterized the plasmids that carry carbapenemase gene by S1-PFGE, Southern blot, plasmid replicon typing and whole plasmid sequencing. A novel IncX3 plasmid was found to carry blaKPC gene. Together with the previously reported blaNDM-1 carrying IncX3 plasmids, it shows that IncX3 plasmids might be new epidemic plasmids involved in the dissemination of carbapenemase genes. These novel IncX3 plasmids are worrisome. Nationwide surveillance and more epidemiological study of IncX3 plasmids are needed. (Word D


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Product Details
  • ISBN-13: 9781361333419
  • Publisher: Open Dissertation Press
  • Publisher Imprint: Open Dissertation Press
  • Height: 279 mm
  • No of Pages: 214
  • Spine Width: 13 mm
  • Width: 216 mm
  • ISBN-10: 1361333413
  • Publisher Date: 26 Jan 2017
  • Binding: Hardback
  • Language: English
  • Series Title: English
  • Weight: 785 gr


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