Antimicrobial resistance and toxin gene profiles of Staphylococcus aureus strains from Holstein milk

文献类型： 外文期刊

第一作者： Wang, X.

作者： Wang, X.;Wang, Y.;Usman, T.;Zhang, Y.;Yu, Y.;Wang, X.;Hao, D.;Tang, X.;Guo, G.;Guo, G.

作者机构：

关键词： Staphylococcus aureus;antimicrobial resistance;PFGE;Holstein;toxin genes;mastitis

期刊名称：LETTERS IN APPLIED MICROBIOLOGY （ 影响因子：2.858； 五年影响因子：2.776 ）

ISSN： 0266-8254

年卷期： 2014 年 58 卷 6 期

页码：

收录情况： SCI

摘要： Isolation of Staphylococcus aureus (Staph.aureus) from Holstein milk samples with mastitis and nonmastitis was conducted to estimate its prevalence, antimicrobial resistance and toxin genes. A total of 353 milk samples were collected from three Chinese Holstein herds. Fifty-three Staph.aureus isolates collected from 29 Staph.aureus-positive samples were characterized via antimicrobial susceptibility, toxin genes and Pulsed-field Gel Electrophoresis (PFGE) profiles. The prevalence of Staph.aureus was 4 center dot 0-9 center dot 5% in mastitic and 7 center dot 3-11 center dot 5% in nonmastitic samples in the analysed herds. Approximately 61 center dot 0% of Staph.aureus strains isolated from mastitis cows were resistant to >= 10 antimicrobials compared with 0% of isolates with nonmastitis. The most frequently observed super antigenic toxin gene was pvl (41 center dot 5%) followed by seh+pvl (13 center dot 2%). We did not find mecA-positive methicillin-resistant Staph.aureus (MRSA) strains, while mecA-negative MRSA strains were identified in the three herds. PFGE results suggested potential transmission of Staph.aureus strains in different farms. These results open new insights into Staph.aureus transmission and antimicrobial resistance of Holstein dairy cows and into developing strategies for udder health improvement of dairy cattle.

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