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Oregano EO inhibited the growth of S. epidermidis faster than P. acnes. Oregano EO at concentrations of 0.672, 1.34, 2.68 mg/mL (1, 2, 4 MIC) and no EO control was used for assaying the killing rate of bacterial cells at 0, 2, 4, 8 and 12 h and expressed as the surviving bacteria (log10 CFU/mL) at different exposure times. We used starting bacterial suspension concentration 108 CFU/mL. Oregano EO killing rate against (a) S. epidermidis and (b) P. acnes.
