Abstract

Escherichia coli is a widespread environmental pathogen frequently causing dairy cow mastitis. This bacterium is particularly capable of acquiring antimicrobial resistance, which can have severe impacts on animal food safety and human health. The objective of the study was to investigate antimicrobial resistance and genetic correlations of E. coli from dairy cow mastitis cases in northern China.

Forty strains of E. coli from 196 mastitis milk samples were collected, susceptibility to 13 common antibiotics and the prevalence of resistance genes were tested in these strains, and the genetic characteristics were identified by multilocus sequence typing.

The results showed that most isolates were multidrug resistant (MDR) (75%), and the resistance rates to cefazolin, trimethoprim-sulfamethoxazole and ampicillin were 77.5%, 55.0%, and 52.5%, respectively. The representative genes of the isolates were aadA (62.5%) and tet(B) (60.0%). Multilocus sequence typing showed 19 different sequence types (STs) and 5 clonal complexes (CCs) in the 40 isolates, mainly represented by ST10 and CC10. The strains of the same ST or CC showed a high level of genetic relatedness, but the characteristics of their antimicrobial resistance were markedly different.

Most E. coli isolates in the study were MDR strains. Some strains of the same ST or CC showed diverse resistance characteristics to common antimicrobials. Therefore, E. coli from dairy cow mastitis in northern China should be investigated to elucidate its antimicrobial resistance and genotypes.

Details

Title
Analysis of antimicrobial resistance and genetic correlations of Escherichia coli in dairy cow mastitis
Author
Li, Ke 1 ; Hou, Mingyuan 1 ; Zhang, Lin 1 ; Tian, Mengyue 1 ; Yang, Ming 1 ; Li, Jia 1 ; Liang, Yanyan 1 ; Zou, Dongmin 1 ; Liu, Ruonan 1 ; Ma, Yuzhong 1 

 College of Veterinary Medicine, Hebei Agricultural University, Baoding, Hebei 071001, China 
Pages
571-579
Publication year
2022
Publication date
2022
Publisher
De Gruyter Poland
ISSN
24507393
e-ISSN
24508608
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2758127265
Copyright
© 2022. This work is published under http://creativecommons.org/licenses/by-nc-nd/3.0 (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.