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Year : 2016  |  Volume : 34  |  Issue : 1  |  Page : 33-37

First description of SHV-148 mediated extended-spectrum cephalosporin resistance among clinical isolates of Escherichia coli from India

1 Department of Microbiology, Assam University Silchar, Silchar, India
2 Department of Life Science and Bioinformatics, Assam University Silchar, Silchar, India
3 Department of Microbiology, Silchar Medical College and Hospital, Silchar, India

Correspondence Address:
Amitabha Bhattacharjee
Department of Microbiology, Assam University Silchar, Silchar
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0255-0857.174110

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Purpose: The present study was aimed to investigate the genetic context, association with IS26 and horizontal transmission of SHV-148 among Escherichia coli in Tertiary Referral Hospital of India. Methodology: Phenotypic characterisation of extended-spectrum beta-lactamases (ESBLs) was carried out as per CLSI criteria. Molecular characterisation of blaSHVand integron was carried out by polymerase chain reaction (PCR) assay and confirmed by sequencing. Linkage of IS26 with blaSHV-148was achieved by PCR. Purified products were cloned on pGEM-T vector and sequenced. Strain typing was performed by pulsed field gel electrophoresis with Xba I digestion. Transferability experiment and antimicrobial susceptibility was performed. Results: A total of 33 isolates showed the presence of SHV-148 variant by sequencing and all were Class 1 integron borne. PCR and sequencing results suggested that all blaSHV-148 showed linkage with IS26 and were present in the upstream portion of the gene cassette and were also horizontally transferable through F type of Inc group. Susceptibility results suggest that tigecycline was most effective. Conclusion: The present study reports for the first time of SHV-148 mediated extended spectrum cephalosporin resistance from India. Association of their resistance gene with IS26 and Class 1 integron and carriage within IncF plasmid signifies the potential mobilising unit for the horizontal transfer.


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2004 - Indian Journal of Medical Microbiology
Published by Wolters Kluwer - Medknow

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