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Antimicrobial Resistance & Infection Control

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Open Access 01-12-2017 | Research

Epidemic characterization and molecular genotyping of Shigella flexneri isolated from calves with diarrhea in Northwest China

Authors: Zhen Zhu, Mingze Cao, Xuzheng Zhou, Bing Li, Jiyu Zhang

Published in: Antimicrobial Resistance & Infection Control | Issue 1/2017

Abstract

Background

The widespread presence of antibiotics resistance genes in pathogenic bacteria can cause enormous problems. Food animals are one of the main reservoirs of intestinal pathogens that pose a potential risk to human. Analyzing the epidemiological characteristics and resistance patterns of Shigella flexneri in calves is necessary for animal and human health.

Methods and results

A total of 54 Shigella flexneri isolates, including six serotypes (1a, 2a, 2b, 4a, 6 and Xv), were collected from 837 fecal samples obtained from 2014 to 2016. We performed pulsed-field gel electrophoresis (PFGE) and applied the restriction enzyme NotI to analyze the genetic relatedness among the 54 isolates and to categorize them into 31 reproducible and unique PFGE patterns. According to the results of antimicrobial susceptibility tests, all 26 Shigella flexneri 2a serotypes were resistant to cephalosporin and/or fluoroquinolones. The genes bla _TEM-1, bla _OXA-1, and bla _CTX-M-14 were detected in 19 cephalosporin-resistant S. flexneri 2a isolates. Among 14 fluoroquinolone-resistant isolates, the aac(6′)-Ib-cr gene was largely present in each strain, followed by qnrS (5). Only one ciprofloxacin-resistant isolate harbored the qepA gene. Sequencing the quinolone resistance determining regions (QRDRs) of the fluoroquinolone-resistant isolates revealed two point mutations in gyrA (S83 L, D87N/Y) and a single point mutation in parC (S80I). Interestingly, two gyrA (D87N/Y) strains were resistant to ciprofloxacin.

Conclusions

The current study enhances our knowledge of Shigella in cattle, although continual surveillance is necessary for the control of shigellosis. The high level of cephalosporin and/or fluoroquinolone resistance in Shigella warns us of a potential risk to human and animal health.

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Title: Epidemic characterization and molecular genotyping of Shigella flexneri isolated from calves with diarrhea in Northwest China
Authors: Zhen Zhu
Mingze Cao
Xuzheng Zhou
Bing Li
Jiyu Zhang
Publication date: 01-12-2017
Publisher: BioMed Central
Published in: Antimicrobial Resistance & Infection Control / Issue 1/2017
Electronic ISSN: 2047-2994
DOI: https://doi.org/10.1186/s13756-017-0252-6

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