Table 3.

Antimicrobial activity of laurel leaf essential oils from wild-grown trees in Greece and Georgia (mean ± SD).

Test microorganisms	Inhibitory zone diameter (IZ), mm			Antibiotics
	Laurel leaf essential oil from Greece 10 μl/disc	Laurel leaf essential oil from Georgia 10 μl/disc	1,8-cineole 3 μl/disc	Ciprofloxacin
Gram-positive bacteria
B. cereus ATCC 11778	18.0 ± 0.18	12.0 ± 0.13	10.2 ± 0.30	28.0 ± 0.27
E. faecalis (clinical isolate)	52.0 ± 0.53	11.5 ± 0.13	10.0 ± 0.11	26.0 ± 0.26
E. faecium (clinical isolate)	20.0 ± 0.19	12.0 ± 0.13	10.0 ± 0.11	ni
S. aureus ATCC 6538	40.0 ± 0.38	12.5 ± 0.13	10.5 ± 0.13	30.0 ± 0.29
S. aureus (clinical isolate)	19.0 ± 0.19	15.0 ± 0.16	12.5 ± 0.13	30.0 ± 0.29
L. monocytogenes NCTC 11994	12.0 ± 0.13	10.0 ± 0.10	9.5 ± 0.11	18.0 ± 0.17
Gram-negative bacteria
E. coli ATCC 25922	15.6 ± 0.17	nia	8.4 ± 0.08	21.5 ± 0.20
K. pneumoniae (clinical isolate)	10.0 ± 0.11	ni	ni	13.0 ± 0.13
S. abony ATCC 6017	14.0 ± 0.14	9.5 ± 0.11	8.4 ± 0.08	12.5 ± 0.13
S. abony (clinical isolate)	14.0 ± 0.14	9.0 ± 0.10	8.4 ± 0.08	18.5 ± 0.20
S. flexneri (clinical isolate)	14.0 ± 0.14	ni	ni	16.5 ± 0.14
P. aeruginosa ATCC 27853	ni	ni	ni	15.0 ± 0.14
P. aeruginosa (clinical isolate)	ni	ni	ni	12.0 ± 0.13
P. fluorescens (clinical isolate)	ni	ni	ni	16.8 ± 0.17
P. mirabilis (clinical isolate)	11.0 ± 0.12	ni	ni	12.0 ± 0.13
P. vulgaris (clinical isolate)	12.0 ± 0.13	8.5 ± 0.08	8.2 ± 0.08	12.5 ± 0.13
Yeasts				Fluconazole
C. albicans ATCC 10231	24.8 ± 0.24	16.3 ± 0.14	14.2 ± 0.13	21.5 ± 0.21
C. albicans (clinical isolate)	21.0 ± 0.21	16.0 ± 0.14	14.1 ± 0.11	22.5 ± 0.22
C. glabrata (clinical isolate)	15.0 ± 0.14	10.0 ± 0.10	9.1 ± 0.11	21.0 ± 0.20
C. tropicalis (clinical isolate)	16.6 ± 0.15	12.0 ± 0.13	10.1 ± 0.11	16.5 ± 0.16

^ani – no inhibition detected.