First Report of New Delhi Metallo-Β-Lactamase-6 (Ndm-6) Among Klebsiella Pneumoniae St147 Strains Isolated From Dialysis Patients in Iran Publisher Pubmed



Bahramian A¹ ; Shariati A¹ ; Azimi T² ; Sharahi JY¹ ; Bostanghadiri N¹ ; Gachkar L³ ; Ghalavand Z¹ ; Chirani AS¹ ; Erfanimanesh S⁴ ; Hashemi A¹
Source: Infection# Genetics and Evolution Published:2019

Abstract

There has been an alarming health-related concern about the growth of New Delhi metallo-β-lactamase. The aims of this study include the phenotypic detection of β-lactamases and molecular characterization of NDM in Klebsiella pneumoniae isolates in Tehran, Iran. A total of 120 K. pneumoniae isolates were collected from hospitalized haemodialysis patients, Tehran, Iran from March 2014 to February 2017. Antibiotic susceptibility tests were conducted using Kirby-Bauer disc diffusion and Broth Microdilution methods according to Clinical and Laboratory Standards Institute guidelines. Metallo-β-lactamase was detected using the Combined Disc Diffusion Test (CDDT), and production of carbapenemase was screened using the Modified Hodge Test. NDM-producing K. pneumoniae strains were screened for the presence of mcr-1 gene, β-lactamase genes, and 16S rRNA methylase genes by Polymerase Chain Reaction and sequencing. Molecular typing of the strains was determined using Repetitive Sequence Based-PCR and Multilocus Sequence Typing. The bla NDM-6 gene was detected in 3 (2.5%) out of 120 isolates from dialysis patients. Also, the three isolates were positive for bla CTX-M-15 bla TEM extended-spectrum β-lactamase genes, armA type plasmid-mediated 16S rRNA methylase and CMY-type plasmid-mediated AmpC β-lactamase. The isolates were identified as MLST sequence type 147 (ST147). This is the first report of bla NDM-6 in K. pneumoniae strains, isolated in Iran. © 2019 Elsevier B.V.