Chemical composition of essential oils of eight Tunisian Eucalyptus species and their antibacterial activity against strains responsible for otitis

Table 4 Diameter of the inhibition of the inhibition of ear infection bacterial growth by individual essential oils and by the antibiotic (Gentamicin)

Eucalyptus Species oils	Bacterial Strains
	Gram-negative					Gram-positive
	E.coli	H. influenzae	H.parainfluenza e	K. pneumoniae	P.aeruginosa	S.aureus
E. accedens	12.3 ± 3.8^b*)	1tr ± 1.0^ab	12.7 ± 2.5^b	7.0 ± 1.7^a	6.3 ± 0.6^a	9.3 ± 0.6^a
E. bosistoana	13.7 ± 1.5^bc**)	6.0 ± tr^a	7.3 ± 1.5^ab	16.0 ± 1.7^bcd	6.0 ± tr^a	10.7 ± 4.0^ab
E. cladocalyx	15.7 ± 3.2^bcd	6.0 ± tr^a	6.3 ± 0.6^a	15.0 ± 4.4^bc	6.0 ± tr^a	8.0 ± 2.6^a
E.lesouefii	1tr ± 2.0^ab	9.3 ± 1.2^ab	9.3 ± 2.1^ab	8.7 ± 1.2^a	8.3 ± 0.6^a	13.3 ± 1.2^b
E. melliodora	19.7 ± 6.7^de	6.3 ± 0.6^a	7.0 ± 1.7^ab	19.7 ± 2.9^cd	6.0 ± tr^a	8.3 ± 2.1^a
E. punctata	6.0 ± tr^a	11.7 ± 2.1^b	10.7 ± 3.5^ab	7.0 ± tr^a	6.0 ± tr^a	9.7 ± 3.2^a
E. robusta	20.7 ± 1.5^de	1tr ± 1.0 ^ab	1tr ± 2.6^ab	16.0 ± 4.6^bcd	7.7 ± 1.5^a	6.3 ± 0.6^a
E. wandoo	18.3 ± 0.6^cde	9.0 ± 1.0 ^ab	9.3 ± 0.6^ab	12.0 ± 1.7^ab	6.0 ± tr^a	9.0 ± 1.0^a
Gentamicin	24.2 ± 2.3^e	31.4 ± 2.1^c	38.6 ± 2.8^c	21.5 ± 2.4^d	26.4 ± 1.6^b	29.9 ± 1.0^c

^*) Values are means (mm ± MSD) of triplicate determination; ^**) Values with different letters differ significantly by Duncan’s multiple range test (P < 0.05)

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