Table 3.

Antimicrobial susceptibility and resistance of anaerobic organisms other than B. fragilis to selected antimicrobials from 2007 to 2009.

Percent susceptible (%S) and percent resistant (%R)b	A/Sa			P/T			FOX			ETP			IPM			MEM			PEN/AMP			CC			MXF			MTZ
	N	%S	%R	N	%S	%R	N	%S	%R	N	%S	%R	N	%S	%R	N	%S	%R	N	%S	%R	N	%S	%R	N	%S	%R	N	%S	%R
Breakpoints in μg/mL	–	≤8/4	≥32/16	–	≤32/4	≥128/4	–	≤16	≥64	–	≤4	≥16	–	≤4	≥16	–	–	≥16	–	≤0.5	≥2	–	≤2	≥8	–	≤2	≥8	–	≤8	≥32
Prevotella spp.	173	98	1	173	99	1	173	99	1	173	100	0	173	100	0	173	–	1	173	40	49	173	66	30	173	59	24	173	100	0
Fusobacterium nucleatum-necrophorum	44	100	0	44	100	0	44	100	0	44	100	0	44	100	0	44	–	0	44	100	0	44	100	0	44	95	5	44	100	0
Anaerobic gram-positive cocci	168	98	1	168	100	0	168	100	0	168	100	0	168	100	0	168	–	0	168	96	3	168	78	20	168	82	11	168	98	1
Veillonella spp.	28	100	0	28	61	7	28	100	0	28	100	0	28	100	0	28	–	0	28	57	28	28	89	7	28	79	14	28	86	11
Propionibacterium acnes	34	100	0	34	100	0	34	100	0	34	100	0	34	100	0	34	–	0	34	100	0	34	91	3	34	100	0	34	3	97
Clostridium perfringens	73	100	0	73	100	0	73	100	0	73	100	0	73	100	0	73	–	0	73	100	0	73	96	0	73	99	1	73	100	0
Other Clostridium spp.c	43	100	0	43	100	0	43	47	26	43	100	0	43	100	0	43	–	0	43	79	9	43	56	21	43	74	12	43	100	0

^aThe following antimicrobials were used: Ampicillin-sulbactam (A/S), Piperacillin-Tazobactam (P/T), Cefoxitin (FOX), Ertapenem (ETP), Imipenem (1PM), Meropenem (MEM), Penicillin/Ampicillin (PEN/AMP), Clindamycin (CC), Moxifloxacin (MXF), Metronidazole (MTZ).

^bIntermediate category is not shown, but can be derived by subtraction of %S and %R for each antimicrobial agent from %100.

^cClostridium spp. excludes Clostridium difficile.