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This study aimed to evaluate the antibacterial effect of  Origanum vulgare  essential oil (OVEO) against ESBL- and non-ESBL-producing multidrug-resistant (MDR)  Enterobacteriaceae  isolates. OVEO composition was determined using Gas chromatograph-mass spectrometer (GC/MS). In the current study, the effect of OVEO was studied on seven MDR  Enterobacteriaceae  isolates. Antibacterial activity of OVEO was investigated by the disc diffusion assay and twofold serial dilution method. GC/MS analysis identified thymol (78.21%) as the single major component present in the OVEO. This EO showed an unexpectedly high antibacterial activity against all the studied MDR  Enterobacteriaceae  isolates, with inhibition zone diameters and minimum inhibitory concentration (MIC) values ranging from 28 ± 0.6 to 35 ± 0.6 mm and 0.31 ± 0.0 to 5 ± 0.0 μL/mL, respectively. However, ESBL-producing isolates were more susceptible to OVEO than non-ESBL producing isolates. This study compared, for the first time, the sensitivity to OVEO between ESBL and non-ESBL-producing  Enterobacteriaceae  isolates.

natural product research

Comparison of sensitivity to a commercial  Origanum vulgare  essential oil between extended-spectrum β-lactamases (ESBL-) and non-ESBL-producing  Enterobacteriaceae  isolates