Table 2.

Comparison of susceptibility to RIF and RFX of C. difficile strains from the JGH (Montreal, Canada) and the ISS (Rome, Italy)

Antibiotic	Source	No. (%) of resistant isolates	MIC data (μg/ml)
			MIC50	MIC90	Range
RIF	JGH	2 (2.4)	<0.002	<0.002	<0.002–>16
	ISS	16 (18.8)		>16
	Total	18 (11.3)		0.05
RFX	JGH	2 (2.4)	0.004	0.008	<0.002–>16
	ISS	16 (18.8)		>16
	Total	18 (11.3)		4