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Volume 3, Issue 3

CTX-M-type ESBL-mediated resistance to third-generation cephalosporins and conjugative transfer of resistance in Gram-negative bacteria isolated from hospitals in Tamil Nadu, India Open Access

Abstract

Clinical pathogens, especially Gram-negative bacteria developing resistance to third-generation cephalosporins, are making clinical outcomes more complicated and serious. This study was undertaken to evaluate the distribution of CTX-M-type extended-spectrum β-lactamases (ESBLs) in Tamil Nadu, India. For this study, clinical samples were collected from five different hospitals located in Tamil Nadu and the ESBL-producing Gram-negative isolates were characterized. MIC was performed using cefotaxime and ceftazidime. The -producing genes were screened using multiplex PCR for the genes, CTX-M group-1, -2, -8, -9, -26. The conjugation studies were performed using AB1157 as a recipient for the isolates harbouring plasmid-borne resistance following broth-mating experiment. In total, 1500 samples were collected and 599 Gram-negative bacteria were isolated that included (=233), (=182), (=79), spp. (=30), (=28), spp. (=21), (=12), . (=6), spp. (=4), (=3) and spp. (=1). MIC results showed that 358 isolates were resistant to cefotaxime and ceftazidime. Further, ESBL gene-amplification results showed that 19 isolates had CTX-M group-1 gene including (=16) (=2) and (=1) whereas one isolate had CTX-M group-9, which was plasmid-borne. Through conjugation studies, 12/20 isolates were found to be involved in the transformation of its plasmid-borne resistance gene. Our study highlighted the importance of horizontal gene transfer in the dissemination of plasmid-borne resistance genes among the clinical isolates.

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Keyword(s): cefotaxime , cephalosporins , CTX-M , ESBL , plasmid-borne resistance and transconjugation
© 2021 The Authors
  • This is an open-access article distributed under the terms of the Creative Commons Attribution License.
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2020-06-11
2024-04-24
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CTX-M-type ESBL-mediated resistance to third-generation cephalosporins and conjugative transfer of resistance in Gram-negative bacteria isolated from hospitals in Tamil Nadu, India
Access Microbiology 3, 000142 (2021); https://doi.org/10.1099/acmi.0.000142
/content/journal/acmi/10.1099/acmi.0.000142
/content/journal/acmi/10.1099/acmi.0.000142
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