Table 2. Antimicrobial drug susceptibility of toxinotype V Clostridium difficile isolates, 1989–2006*.

Source	N	Clindamycin				Levofloxacin†				Moxifloxacin			Gatifloxacin†
		S	I/R	Range		S	I/R	Range		S	Range		S	Range
Human	14	2 (14)	12 (86)	2–>256		6 (43)	8 (57)	2–>32		14 (100)	0.5–1		14 (100)	0.5–1
Recent	7	2 (29)	5 (71)	2–>256		0	7 (100)	>32		7 (100)	0.5		7 (100)	0.5–1
Past	7	0	7 (100)	4–>256		7 (100)	0	2–4		7 (100)	0.5–1		7 (100)	0.5–1
Porcine	8	0	8 (100)	4-–>256		2 (25)	6 (75)	2–>32		8 (100)	0.5–1		8 (100)	0.5–1
Bovine	8	7 (88)	1 (12)	1–4		8 (100)	0	2–4		8 (100)	0.5		8 (100)	0.5

*No. (%) Clostidium difficile isolates shown in each interpretive category. S, susceptible; I/R, intermediate or resistant.
†Using moxifloxacin interpretive criteria.