Abstract | Objectives: mcr-1-mediated colistin resistance in bacteria is concerning, as colistin is used in treating multidrug-resistant bacterial infections. And mcr-1-producing bacteria have been identified in multiple sources. Up to 248 million people use public transportation daily in China, however; public transportation hasn't been studied as a potential source of community-based transmission of mcr-1. Herein we investigated mcr-1-producing isolates from public transportation and explored the genomic characteristics of them. Methods: Surface samples were collected from public transportation in Guangzhou, China, from October 2016 to April 2017. Polymerase chain reaction was performed to detect mcr-1 gene, plasmid replicon type and phylogenetic group. Minimum inhibitory concentrations (MICs) were determined by microdilution method. S1-nuclease digestion and pulsed-field gel electrophoresis (S1-PFGE) and Southern blotting were performed with mcr-1-harboring plasmids. Whole-genome sequencing was performed with mcr-1-producing isolates. Results: Of the 737 samples with bacterial growth, 26 isolates were positive for mcr-1, including 23 Escherichia coli and 3 Klebsiella pneumoniae isolates. The E. coli isolates belonged to phylogroups A and B1. Most mcr-1-producing isolates were resistant to ampicillin (25), cefotaxime (21), fosfomycin (16), and gentamicin (15). S1-PFGE, Southern blotting and replicon typing showed that mcr-1 was mainly located on ~33.3 kb to ~220 kb IncX4, IncI2 and IncHI2 plasmids in E. coli, while located on ~33.3 kb untyped plasmid in K. pneumoniae. Several sequence types (ST), including ST2253, ST101, ST10 complex and ST37, were revealed. Between 53 and 66 (mean = 61.8) resistance genes were identified among mcr-1-producing isolates. Conclusions: Public transportation may serve as a source of mcr-1-producing bacteria.
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Authors | Cong Shen, Siyuan Feng, Hongtao Chen, Min Dai, David L Paterson, Xiaobin Zheng, Xingui Wu, Lan-Lan Zhong, Yan Liu, Yong Xia, Rui Ma, Xi Huang, Guo-Bao Tian |
Journal | Clinical infectious diseases : an official publication of the Infectious Diseases Society of America
(Clin Infect Dis)
Vol. 67
Issue suppl_2
Pg. S217-S224
(11 13 2018)
ISSN: 1537-6591 [Electronic] United States |
PMID | 30423047
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Anti-Bacterial Agents
- Escherichia coli Proteins
- MCR-1 protein, E coli
- Colistin
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Topics |
- Anti-Bacterial Agents
(pharmacology)
- China
(epidemiology)
- Colistin
(pharmacology)
- Drug Resistance, Multiple, Bacterial
(genetics)
- Enterobacteriaceae
(drug effects, genetics)
- Enterobacteriaceae Infections
(epidemiology, transmission)
- Escherichia coli
(drug effects, genetics)
- Escherichia coli Proteins
(genetics)
- Humans
- Klebsiella pneumoniae
(drug effects, genetics)
- Microbial Sensitivity Tests
- Motor Vehicles
- Plasmids
(genetics)
- Polymerase Chain Reaction
- Public Health
- Railroads
- Transportation
- Whole Genome Sequencing
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