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mljgoums 2017, 11(4): 34-38 |
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Nofouzi K, Rakhshanpoor A, Asadpour R. Antibiotic Susceptibility and Plasmid Profiles of Staphylococcus aureus Strains Isolated from Bovine Subclinical Mastitis in Tabriz, Iran. mljgoums 2017; 11 (4) :34-38
URL: http://mlj.goums.ac.ir/article-1-990-en.html
URL: http://mlj.goums.ac.ir/article-1-990-en.html
1- Department of Pathobiology, Faculty of Veterinary Medicine, University of Tabriz, Tabriz, Iran
2- Residency student of Small Animal Internal Medicine, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
3- Department of Clinical Science, Faculty of Veterinary Medicine, University of Tabriz, Tabriz, Iran
2- Residency student of Small Animal Internal Medicine, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
3- Department of Clinical Science, Faculty of Veterinary Medicine, University of Tabriz, Tabriz, Iran
Abstract: (13556 Views)
ABSTRACT
Background and Objectives: Mastitis caused by Staphylococcus aureus is a widely distributed disease in cattle, goats and sheep. The infection is often subclinical in cattle, leading to reduced milk production and quality, but acute catarrhal or even gangrenous inflammation may also occur. The aim of this study was to investigate resistance of S. aureus isolates from bovine subclinical mastitis to a number of antibiotics.
Methods: Milk samples were collected from 120 cows in different regions of Tabriz, Iran. Milk samples were cultured and bacteriological identification was performed. Antimicrobial susceptibility of the isolates was assessed by determining minimum inhibitory concentration. Plasmid DNA was extracted by an alkaline lysis method.
Results: The highest frequency of resistance was observed against gentamicin (100%) and β- lactam antibiotics including amoxicillin (96%), ampicillin (40%) and penicillin (96%). The isolates mostly contained large plasmids, which might harbor acquired antibiotic resistance.
Conclusion: The results confirm the high frequency of antibiotic resistance among staphylococci isolated from bovine subclinical mastitis.
Keywords: Anti-infective Agents, Cattle, Staphylococcus Aureus, Mastitis, Plasmids.
Background and Objectives: Mastitis caused by Staphylococcus aureus is a widely distributed disease in cattle, goats and sheep. The infection is often subclinical in cattle, leading to reduced milk production and quality, but acute catarrhal or even gangrenous inflammation may also occur. The aim of this study was to investigate resistance of S. aureus isolates from bovine subclinical mastitis to a number of antibiotics.
Methods: Milk samples were collected from 120 cows in different regions of Tabriz, Iran. Milk samples were cultured and bacteriological identification was performed. Antimicrobial susceptibility of the isolates was assessed by determining minimum inhibitory concentration. Plasmid DNA was extracted by an alkaline lysis method.
Results: The highest frequency of resistance was observed against gentamicin (100%) and β- lactam antibiotics including amoxicillin (96%), ampicillin (40%) and penicillin (96%). The isolates mostly contained large plasmids, which might harbor acquired antibiotic resistance.
Conclusion: The results confirm the high frequency of antibiotic resistance among staphylococci isolated from bovine subclinical mastitis.
Keywords: Anti-infective Agents, Cattle, Staphylococcus Aureus, Mastitis, Plasmids.
Research Article: Original Paper |
Received: 2017/08/8 | Accepted: 2017/08/8 | Published: 2017/08/8 | ePublished: 2017/08/8
Received: 2017/08/8 | Accepted: 2017/08/8 | Published: 2017/08/8 | ePublished: 2017/08/8
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