Objective: To study the effect of Zataria multflora essential oil on the clinical isolates of Streptococcus, agalactiae, Staphylococcus, aureus and E. coli isolated from milk of cows with mastitis.
Design: Discription study.
Procedure: In this study milk samples from cows affected by mastitis were collected from a farm near Tehran. Using microbiological, biochemical and serological methods, bacteria were isolated, identified and serotyped. The MIC of Zataria multiflora essential oil against Streptococcus, agalactiae, Staphylococcus, aureus and Escherichia coli, isolated in this study were evaluated.
Results: Sterptococcus agalactiae, Staphylococcus aureus and Escherichia coli were isolated from 6, 21 and 5 samples respectively. All the isolated strains were more resistant to Zataria multiflora essential oil than the standard ones. The MICs of Zataria multiflora on isolated strains of S. aureus and Strep. agalactiae used in this study were 4 and 1.5 times
more than the corresponding standard strains. Conclusion: According to the results of this study, Zataria multiflora essential oil had good antibacterial effect on the isolated strains of Streptococcus agalactiae and Staphylococcus aureus. J.Fac. Vet.Med. Univ. Tehran. 60,2:107-110,2005.