Med. Weter. 75 (4), 238-241, 2019

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Effects of Carvacrol on Staphylococcus aureus isolated from bulk tank milk
The occurrence of multidrug-resistant Staphylococcus aureus is an important causative agent of mastitis in cattle and of foodborne diseases. It is a worldwide concern, making it essential to develop alternative treatments to fight against the bacteria. Thus, the aim of this study is to determine the ability of carvacrol to inhibit the growth of S. aureus isolated from bulk tank milk in Turkey’s Burdur Province. All strains (n = 31) were used to investigate the antimicrobial activity of carvacrol, including the methicillin-resistant S. aureus and strains from the American Type Culture Collection and England’s National Collection of Type Cultures. The minimum inhibitory concentration (MIC) values were determined via a microdilution method, and the antimicrobial susceptibility profiles via a disk diffusion method. Antibiotic resistance was detected in 20 strains (64.5%). Multidrug resistance was observed in 8 strains (25.8%). Carvacrol exhibited strong antimicrobial activity, with MIC value at 0.058-0.234 mg/ml, in the microdilution method. Inhibition zones of carvacrol were in the range of 19 to 45 mm. The results of this study emphasize the promising role of carvacrol among new antibacterial agents that can combat S. aureus strains.
Keywords: Carvacrol, drug-resistant bacteria, MIC, Staphylococcus aureus