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Authors Lu J, Quan J, Zhao D, Wang Y, Yu Y, Zhu J
Received 17 October 2018
Accepted for publication 4 December 2018
Published 28 December 2018 Volume 2019:12 Pages 105—110
DOI https://doi.org/10.2147/IDR.S190269
Checked for plagiarism Yes
Review by Single-blind
Peer reviewers approved by Dr Colin Mak
Peer reviewer comments 2
Editor who approved publication: Professor Suresh Antony
Objectives: mcr-1 gene has
been widely reported in the world. This study aimed to analyze the prevalence
and molecular characteristics of mcr-1 gene in Salmonella typhimurium from
Quzhou People’s Hospital.
Materials and methods: A total
of 62 S. typhimurium isolates
were isolated and preserved in our laboratory from 2007 to 2016. PCR was used
to screen plasmid-mediated colistin resistance gene, mcr-1 . For mcr-1 -positive
isolates, susceptibilities to colistin and other antibiotics were assessed
using broth microdilution or agar dilution methods. The genetic location
of mcr-1 was
determined by analysis of pulsed-field gel electrophoresis profiles of
S1-digested genomic DNA and subsequent Southern blot hybridization. The
multi-locus sequence type and other drug resistance genes found in the mcr-1 -positive
isolates were analyzed by performing whole genome sequencing. Genetic
environment of mcr-1 gene was analyzed by RAST and Easyfig.
Results: A total
of three S. typhimurium isolates
were identified to be mcr-1 positive, with the prevalence rate of 4.8% (3/62).
The minimum inhibitory concentration values of colistin for all these isolates
were 8 µg/mL. The three mcr-1 -positive isolates carried mcr-1 gene on
two different types of plasmids having the sizes of ~54.7–78.2 kb and 310.1 kb,
respectively. All the three isolates belonged to ST34 and carried various
resistant genes.
Conclusion: Colistin-resistant, mcr-1 -positive S. typhimurium isolates
belonging to ST34 have been isolated from Quzhou People’s Hospital.
Surveillance needs to be strengthened to identify colistin resistance and
prevent the spread of drug-resistant bacteria in the hospital.
Keywords: Salmonella typhimurium ,
colistin, mcr-1