Table 6. Characteristics of the 226 toxigenic C. difficile strains: genotype and antimicrobial susceptibility.

No.of isolates (%)(total n = 226)	ST	Vancomycin (% R)	Metronidazole (% R)	Fidaxomicin (%R)	Rifaximin (% R)	Levofloxacin (% R)	Ciprofloxacin (% R)	Meropenem (%R)	Chloramphenicol (% R)
66 (29.2)	54a	0	0	0	0	39	100	0	3
58 (25.6)	3	0	0	0	0	24	100	3.4	2
24 (10.6)	35	0	0	0	0	50	100	0	17
22 (9.7)	2	0	0	0	0	32	100	4.5	5
19 (8.4)	37	0	0	0	0	84b	100	0	5
6 (2.7)	26	0	0	0	0	1/6	0	0	0
4 (1.8)	8	0	0	0	0	0	4/4	0	0
4 (1.8)	48	0	0	0	0	2/4	4/4	0	0
3 (1.3)	139	0	0	0	0	3/3	3/3	0	0
2 (0.9)	205	0	0	0	0	2/2	2/2	0	0
2 (0.9)	99	0	0	0	0	0	2/2	0	0
1 (0.4)	5	0	0	0	0	0	1/1	0	0
1 (0.4)	15	0	0	0	0	1/1	1/1	0	0
1 (0.4)	33	0	0	0	0	0	1/1	0	0
1 (0.4)	39	0	0	0	0	1/1	1/1	0	0
1 (0.4)	42	0	0	0	0	1/1	1/1	0	0
1 (0.4)	51	0	0	0	0	1/1	1/1	0	0
1 (0.4)	55	0	0	0	0	0	1/1	0	0
1 (0.4)	69	0	0	0	0	1/1	1/1	0	0
1 (0.4)	76	0	0	0	0	0	1/1	1/1	0
1 (0.4)	81	0	0	0	0	1/1	1/1	0	0
1 (0.4)	129	0	0	0	0	0	1/1	0	0
1 (0.4)	150	0	0	0	0	1/1	1/1	0	0
1 (0.4)	234	0	0	0	0	1/1	1/1	0	0
1 (0.4)	286	0	0	0	0	0	1/1	0	0
1 (0.4)	289	0	0	0	0	0	1/1	0	0
1 (0.4)	290	0	0	0	0	0	0	0	0

^a For ST54, ST3, ST35, ST2, and ST37, resistance is expressed as a %; for the remaining STs, the number of resistant isolates is shown.

^b Resistance among the different STs was compared using Fisher’s exact test (vs. levofloxacin, P < 0.05)