Table 2.

Zones of growth inhibition ± SD (mm), minimal inhibition concentration (MIC), and minimal bactericidal concentration (MBC) expressed in % (V/V) and ratio MBC/MIC showing antibacterial activity for McEO against human pathogenic bacteria compared to that of positive standard antibiotic (gentamicin)

Bacterial strains	Inhibition zones diameter ± SD (mm) a		MIC (%)(v/v)	MBC (%)(v/v)	MBC/MIC
	EO b	Gentamicin c
Gram positive
B. subtilis ATCC 6633	18 ± 0.7	20 ± 0.2	0.10 ± 0.7	0.78 ± 0.1	8
B. cereus ATCC 14579	22 ± 0.5	20 ± 0.4	0.39 ± 0.8	0.78 ± 0.3	2
S. aureus ATCC 25923	20 ± 0.7	25 ± 0.8	0.39 ± 0.4	1.56 ± 0.5	4
S. epidermis ATCC 12228	15 ± 0.4	20 ± 0.5	0.19 ± 0.4	1.56 ± 0.2	8
E. faecalis ATCC 29212	15 ± 0.5	12 ± 0.2	0.10 ± 0.7	0.78 ± 0.04	8
L. monocytogenes ATCC 19117	22 ± 0.4	15 ± 0.0	0.40 ± 0.2	0.8 ± 0.02	2
Gram negative
S.enterica ATCC 43972	16 ± 0.6	18 ± 0.8	1.26 ± 0.3	3.12 ± 0.8	2
E. coli ATCC 25922	14 ± 0.3	21 ± 1.0	0.78 ± 04	1.56 ± 0.4	2
P. aeruginosa ATCC 9027	15 ± 0.5	18 ± 0.7	1.56 ± 0.5	3.12 ± 0.7	2

Values are given as mean ± SD of triplicate experiments.

^aDiameter of inhibition zones of including diameter of disk 6 mm.

^bEO: Myrtus communis essential oil (50 µl/well).

^cThe used concentration of gentamicin was 10 μg/well.