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ORIGINAL ARTICLE
Year : 2017  |  Volume : 146  |  Issue : 1  |  Page : 105-110

New Delhi metallo-β-lactamase - type carbapenemases producing Escherichia coli isolates from hospitalized patients: A pilot study


1 Division of Microbiology, National Centre for Disease Control, New Delhi, India
2 Department of Pathology, Himalayan Institute of Medical Sciences, Swami Rama Himalayan University, Dehradun, India
3 Department of Biochemistry, Santosh Medical College, Ghaziabad, India
4 Department of Microbiology, Postgraduate Institute of Medical Education and Research & Dr. Ram Manohar Lohia Hospital, New Delhi, India

Correspondence Address:
Shashi Khare
Division of Microbiology, National Centre for Diseases Control, 22-Sham Nath Marg, New 110 054
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/ijmr.IJMR_594_15

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Background & objectives: Resistances to carbapenem group of antimicrobials among Escherichia coli due to production of carbapenemases, especially the New Delhi metallo-β-lactamase (NDM) types, pose serious challenges in the treatment of infections in healthcare settings. This study was undertaken to detect NDM producing E. coli isolates from hospitalized patients with urinary tract infection (UTI). Methods: A total of 30 non-repetitive isolates of E. coli from hospitalized patients with clinical suspicion of UTI were subjected to antimicrobial susceptibility testing. Screening for the production of extended-spectrum β-lactamases (ESBL) was carried out by minimum inhibitory concentration (MIC) test strip ESBL followed by phenotypic confirmation by double-disc synergy test. Phenotypic confirmation of carbapenemase production was carried out by MIC test strip metallo-β-lactamases. Molecular identification of the blaNDM gene was carried out by polymerase chain reaction (PCR) and sequencing of the amplified fragment. Results: Seventeen of the 30 isolates were detected as ESBL producers, of which three were found to be carbapenemase producers. NDM genes were detected by PCR followed by gene sequencing in all three isolates positive for ESBL as well as carbapenemase. The amino acid sequence of the three isolates showed complete identity to the reference sequences of NDM-1, NDM-4 and NDM-8, respectively. Interpretation & conclusions: Our study showed the circulation of NDM variants among the clinical isolates of E. coli that were producers of ESBL as well as carbapenemase.


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