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Prevalence and molecular characteristics of mcr-1 gene in Salmonella typhimurium in a tertiary hospital of Zhejiang Province.


ABSTRACT: 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.

SUBMITTER: Lu J 

PROVIDER: S-EPMC6312689 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature

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Prevalence and molecular characteristics of <i>mcr-1</i> gene in <i>Salmonella typhimurium</i> in a tertiary hospital of Zhejiang Province.

Lu Jun J   Quan Jingjing J   Zhao Dongdong D   Wang Yanfei Y   Yu Yunsong Y   Zhu Jin J  

Infection and drug resistance 20181228


<h4>Objectives</h4><i>mcr-1</i> gene has been widely reported in the world. This study aimed to analyze the prevalence and molecular characteristics of <i>mcr-1</i> gene in <i>Salmonella typhimurium</i> from Quzhou People's Hospital.<h4>Materials and methods</h4>A total of 62 <i>S. typhimurium</i> isolates were isolated and preserved in our laboratory from 2007 to 2016. PCR was used to screen plasmid-mediated colistin resistance gene, <i>mcr-1</i>. For <i>mcr-1</i>-positive isolates, susceptibil  ...[more]

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