Similar biofilm inhibitory concentrations have been reported at 1.25, 0.31 and 1.25 ml/ml for oregano oil, carvacrol and thymol, respectively (Nostro et al. 2007). Oral et al. (2010) even reported biofilm inhibitory concentration against S.aureus for oregano oil at MIC value as low as 0.5 ml/ml. According to our findings (Table 3),