TABLE 3.

Mean values and interpretations according to EUCAST (2000) of fractional inhibitory concentration indexes (FICI) for piperitenone epoxide (PEO) and antibiotics against 10 Escherichia coli strains.

Strain	AMK	AMP	FEP	CAZ	CRO	LVX	MEM	MIN	TGC
E. coli 1	0.50	0.50	0.50	0.50	0.63	1.50	0.38	0.38	0.49
E. coli 2	0.38	0.50	0.31	0.50	0.31	0.56	0.37	0.19	0.49
E. coli 3	1.50	0.16	0.38	0.19	0.50	0.16	0.19	0.38	1.06
E. coli 4	0.50	0.38	0.38	0.31	0.19	1.06	0.38	0.38	0.30
E. coli 5	0.75	0.50	0.38	0.50	0.13	0.28	0.13	0.50	0.56
E. coli 6	0.50	0.38	0.75	0.38	0.50	0.50	0.38	0.50	1.50
E. coli 7	1.50	0.31	0.50	0.50	0.56	0.26	0.31	0.50	0.75
E. coli 8	0.50	0.31	0.31	0.31	0.38	0.13	0.25	0.50	0.37
E. coli 9	1.13	0.38	0.31	0.31	0.50	0.53	0.25	0.38	0.30
E. coli 10	0.50	0.19	0.56	0.38	0.38	1.06	0.31	0.19	0.30
E. coli 25922	0.50	0.16	0.31	0.19	0.19	0.19	0.31	0.19	0.37
∗Synergy (%)	60	100	80	100	80	50	100	100	60
∗Additive (%)	10	0	20	0	20	20	0	0	20
∗Indifference (%)	30	0	0	0	0	30	0	0	20
∗Antagonism (%)	0	0	0	0	0	0	0	0	0

^∗Reference strain not included. Amikacin (AMK), Ampicillin (AMP), Cefepime (FEP), Ceftazidime (CAZ), Ceftriaxone (CRO), Levofloxacin (LVX), Meropenem (MEM), Minocycline (MIN), Tigecycline (TGC).