TABLE 2.

Minimum inhibitory concentrations (MICs) and fractional inhibitory concentration indexes (FICIs) of EH and Colistin against 10 multidrug-resistant ExPEC isolates.

Strain no.	MIC (mg/L)			FICI	Relationship
	Colistin alone	Ellipticine hydrochloride combination	Colistin combination
E. coli (1145)	8	0.25	0.5	0.3125	S
E. coli (13712)	8	0.25	0.5	0.3125	S
E. coli (1209)	8	0.25	0.5	0.3125	S
E. coli (1341)	16	1	8	1.5	I
E. coli (1704087)	8	0.5	1	1.125	I
E. coli (42)	8	0.5	1	0.375	S
E. coli (148121)	16	0.25	4	0.5	S
E. coli (1411060)	8	0.25	1	0.375	S
E. coli (1603043)	8	0.25	2	0.5	S
E. coli (1604040)	4	0.25	0.5	0.25	S

S, synergy; I, indifference; A, antagonism.