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Short Communication: Detection And Molecular Characterization Of Methicillin-Resistant Staphylococcus Aureus Isolated From Subclinical Bovine Mastitis Cases In China

文献类型： 外文期刊

作者： Wang, Ling;Wang, Xurong;Cui, Dongan;Sun, Yan;Yan, Zuoting;Zhang, Hang;Zhang, Shidong;Yang, Feng;Yang, Feng;Li, Hongsheng;Shang, Xiaofei

作者机构：

关键词： Methicillin-Resistant Staphylococcus Aureus; Bovine Mastitis; Antimicrobial Resistance; Virulence Gene

期刊名称： JOURNAL OF DAIRY SCIENCE

ISSN： 0022-0302

年卷期： 2020 年 103 卷 1 期

页码：

摘要： This study investigated the antimicrobial susceptibility of methicillin-resistant Staphylococcus aureus (MRSA) isolated from cases of subclinical bovine mastitis in China, as well as resistance mechanisms and virulence genes encoding adhesins and toxins. We determined antimicrobial susceptibility using the disk diffusion method, and analyzed resistance, adhesin, and toxin genes using PCR. We confirmed MRSA in 73 of 498 (14.7%) Staph. aureus isolates recovered from subclinical mastitic milk samples. All isolates were positive for mecA. The MRSA isolates showed high resistance to penicillin (100.0%), gentamicin (100.0%), and tetracycline (98.6%). All MRSA isolates harbored resistance genes blaZ (penicillin), aacA/aphD (gentamicin), and tetM (alone or in combination with tetK, tetracycline). Moreover, all isolates carried the adhesin genes fnbpA, clfA, clfB, cna, sdrE, and map/eap, and most carried sdrC (98.6%), sdrD (95.9%), bbp (94.5%), and ebpS (80.8%). The toxin genes seh, hla, and hld were present in all isolates, and most isolates carried sea (71.2%), seg (84.9%), sei (82.2%), lukE-lukD (97.3%), and hlg (72.6%). These findings of high-level resistance to antimicrobials commonly used in dairy cattle should lead to calls for antibiogram analysis before antimicrobial therapy. The high frequency of adhesin and toxin genes in MRSA indicates their potential virulence in bovine mastitis in China.

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