Antimicrobial effects of ethanolic, methanolic and Teucrium etil asetat Teocrum polium extracts on Staphylococcus aureus isolated from sheep

Staphylococcus aureus is a gram positive Bactria which has been considered as one of the most common agent of food bacterial poisoning and also considered as a zoonotic disease. Therefore, the aim of the current study was to isolate of different strains of S. aureus from nasal samples of sheep from Sistan region and evaluation of antibiotic resistance of the isolated bacteria against common antibiotics. Moreover, the antibacterial activity of ethanol, methanol and ethyl acetate extracts of Teucrium polium plant on S. aureus was assessed. The plant samples were gathered from Sistan Region. Ethanol extract of plant samples was extracted using vacuum from the center (rotary) apparatus. A total number of 10 S. aureus strains were isolated from the sheep nasal samples from Sistan region. Susceptibility to Oxacillin, Amoxicillin-clavulanic acid, ampicillin, Gentamicin, Cefazolin and Vancomycin antibiotics was evaluated by the Kirby-Bauer disk diffusion standard method. Minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of different concentrations of plant extract were determined on bacteria using dilution in well method. Results of the current study explained that all of the three ethanol, methanol and ethyl acetate extracts had various bactericidal levels on 12 isolated bacteria. Nevertheless, the ethyl acetate extract was batter than two other extracts due to its lower concentrations for its MIC and MBC against S. aureus. Results derived from the current study suggest that ethyl acetate extract of T. polium would be a suitable alternative for common antibiotics.