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Penicillin-resistant characterization of Staphylococcus aureus isolated from bovine mastitis in Gansu, China

文献类型： 外文期刊

作者： Yang Feng 1 ; Liu Long-Hai 1 ; Wang Ling 1 ; Wang Xu-rong 1 ; Li Xin-Pu 1 ; Jin-yin, Luo 1 ; Zhang Zhe 1 ; Zhang Shi-dong 1 ;

作者机构： 1.Chinese Acad Agr Sci, Lanzhou Inst Husb & Pharmaceut Sci, Lanzhou 730050, Gansu, Peoples R China

关键词： Staphylococcus aureus;penicillin-resistant;beta-lactamase;biofilm;ica

期刊名称：JOURNAL OF INTEGRATIVE AGRICULTURE （ 影响因子：2.848； 五年影响因子：2.979 ）

ISSN： 2095-3119

年卷期： 2017 年 16 卷 8 期

页码：

收录情况： SCI

摘要： Bovine mastitis caused by Staphylococcus aureus is difficult to treat because of increasing resistance against antibiotics, especially penicillin. beta-Lactamase and biofilm are responsible for penicillin resistance of S. aureus. The aim of this study was to investigate the beta-lactamase activity and biofilm formation capacity of 37 penicillin-resistant S. aureus strains (35 were blaZ positive and 2 were blaZ negative) from bovine mastitis in Gansu Province, China, as well as to measure the intercellular adhesion genes icaA and icaD of these strains. beta-Lactamase Test Kit was used to determine the beta-lactamase activity, biofilm formation was tested by semi-quantitative adherence assay method. Moreover, the presence of icaA and icaD were measured by PCR. A total of 32 penicillin-resistant S. aureus strains, including the two blaZ-negative strains, were identified as beta-lactamase producers. All tested S. aureus isolates produced biofilm in the microtiter plate assay. Meanwhile, all these strains were PCR-positive for the ica locus, icaA and icaD. The study indicated high prevalence of beta-lactamase activity, biofilm-forming capacity, and the ica genes among the penicillin-resistant S. aureus isolates, and implied that S. aureus resistant to penicillin was attributed to multiple mechanisms.

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