Colistin Resistance in Escherichia coli and Salmonella enterica Strains Isolated from Swine in Brazil

Table 1

Distribution of MIC values of swine E. coli and S. enterica strains through agar dilution test against colistin.

Agar dilution	Number of strains with colistin MIC values (μg/mL)
	≤0.125	0.25	0.5	1	2	4	8	16	32	64	128	256
E. coli	23	51	40	4	0	[0	2	4	2	0	0	0]
S. enterica	0	1	59	30	8	[13	13	0	0	0	0	0]

The values inside [] represent resistant strains.