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- Title
Prevalence and Molecular Characteristics of Avian-Origin mcr -1-Harboring Escherichia coli in Shandong Province, China.
- Authors
Zhao, Xiaonan; Liu, Zhengjie; Zhang, Yin; Yuan, Xiaomeng; Hu, Ming; Liu, Yuqing
- Abstract
The objective of this study was to evaluate the prevalence and characteristics of avian-origin mcr -1-harbouring Escherichia coli in Shandong Province, China. During 2017—2018, a total of 668 non-duplicate E. coli isolates were separately collected from 8eight large intensive poultry farms in Shandong Province. Antimicrobial susceptibility testing for 10 antimicrobial agents commonly used in farms was performed on all E. coli isolates by the agar dilution method; the mobile colistin resistance gene (mcr -1) gene was screened by PCR, and mcr -1 positive isolates were PCR-screened for antimicrobial resistance genes and typed by multi-locus sequence typing (MLST). Among the 668 E. coli , 102 (15.3%) harbored the mcr -1 gene; high antimicrobial resistance rates were observed for ampicillin (100/102, 98.0%), followed by amoxicillin (99/102, 97.1%) and florfenicol (97/102, 95.1%), and a low level of resistance was found for amoxicillin/clavulanic acid (24/102, 23.5%). Five ESBL genes were detected, and all isolates carried bla TEM (102/102, 100%), followed by bla CTX–M (90/102, 88.2%). Four PMQR genes were detected; aac(6)-Ib-cr (40/102, 39.2%) was the most commonly isolated PMQR gene, followed by qnrA (10/102, 9.8%). Thirty-eight different kinds of STs were identified, and the dominant ST was ST93 (19/102, 18.6%), followed by ST48 (9/102, 8.8%). In summary, E. coli from poultry in Shandong could be a reservoir for the mcr -1 gene, which could pose serious risks to human public health.
- Subjects
SHANDONG Sheng (China); CHINA; COLISTIN; ESCHERICHIA coli; DRUG resistance in microorganisms; MICROBIAL sensitivity tests; POULTRY farms; AVIAN influenza A virus; AGRICULTURAL intensification
- Publication
Frontiers in Microbiology, 2020, p1
- ISSN
1664-302X
- Publication type
Article
- DOI
10.3389/fmicb.2020.00255