Table 1.

Antibacterial activity of colistin alone or in combination against Salmonella strains in MH broth.

Strain	Characteristic	MIC (mg/L)				FICI	MBC (mg/L)
		CST	IBG	CST (in combination)	IBG (in combination)		CST	IBG
ATCC14028	S. typhimurium	0.5	>512	0.125	4	0.2578	1	>512
26FS14	S. typhimurium; mcr-1	2	>512	0.25	8	0.1563	4	>512
26FS26	S. typhimurium; mcr-1	2	>512	0.5	16	0.2812	4	>512
S235	S. typhimurium; mcr-1	2	>512	0.25	16	0.1875	4	>512
S226	S. typhimurium; mcr-1	2	>512	0.25	16	0.1875	4	>512

CST, colistin; IBG, isopropoxy benzene guanidine.