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Molecular characteristics,antibiogram and prevalence of multi-drug resistant Staphylococcus aureus (MDRSA) isolated from milk obtained from culled dairy cows and from cows with acute clinical mastitis

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Asian Pacific Journal of Tropical Biomedicine 2017年第8期7卷 694-697页

作者： Zuhair Bani Ismail Department of Veterinary Clinical Sciences Faculty of Veterinary MedicineJordan University of Science and TechnologyIrbid22110Jordan

Objectives: To study the molecular characteristics, antibiogram and prevalence of multidrug resistant Staphylococcus aureus(S. aureus)(MDRSA) isolated from milk obtained from culled dairy cows and from cows with acute clinical ***: Bacteria were cultured from 188 quarter milk samples obtained from cows before culling(n=139) and from cows affected with acute mastitis(n=49) belonging to 10 dairy farms. The bacteria were identified using colony moiphology, Gram staining and biochemical characteristics. S. aureus isolates were then subjected to molecular characterization using PCR targeting 16 S rRNA and mecA gene to identify Methicillin resistant S. aureus(MRSA). The antibiogram of all isolates was performed using the Kirby-Bauer disk diffusion method against 10 commonly used antibiotics in dairy ***: S. aureus was isolated from 19(13.7%) samples obtained from culled cows and 11(22.4%) samples obtained from cows with acute mastitis. In both culled cows and cows with acute mastitis, in vitro antibiogram revealed that 100% of S. aureus isolates were resistant to erythromycin, penicillin G, streptomycin, doxycyclin, and trimethoprim/sulpha. The prevalence of MRSA in milk of culled cows and cows with acute mastitis was 26.3% and 18.2%, respectively, with an overall prevalence of 3.7% among all samples. All MRSA isolates were completely resistant to all tested antibiotics. All MRSA isolates were positive for the presence of the mecA ***: MRSA carrying the mecA gene were isolated from mastitic milk from dairy cows in Jordan for the first time. MRSA may pose a potential health risk to the public, farm workers and veterinarians.

关键词： Antibiogram 乳腺炎病原体奶店奶牛多药抵抗

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