Table 1.

Antimicrobial susceptibility and resistance of Bacteroides fragilis group to selected antimicrobials from 2007 to 2009.

Percent Susceptible (%S) and Percent Resistant (%R)b	A/Sa			P/T			FOX			ETP			IPM			MEM			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
Breakpoints in μg/mL	–	≤8/4	≥32/16	–	≤32/4	≥128/4	–	≤16	≥64	–	≤ 4	≥16	–	≤ 4	≥16	–	≤ 4	≥16	–	≤2	≥8	–	≤2	≥8	–	≤ 8	≥32
B. fragilis	872	89	4	872	98	1	872	85	6	872	96	2	872	98	2	872	97	2	872	64	28	872	53	38	872	100	0
B. thetaiotaomicron	342	86	3	342	92	2	342	32	13	342	96	2	342	99	0	342	99	1	342	27	56	342	44	34	342	100	0
B. ovatus	67	93	2	67	93	2	67	37	15	67	98	0	67	100	0	67	100	0	67	54	39	67	43	39	67	100	0
B. vulgatas	70	67	6	70	100	0	70	83	4	70	98	2	70	98	2	70	98	2	70	49	51	70	43	46	70	100	0
B. uniformis	60	87	2	60	93	0	60	42	13	60	97	0	60	100	0	60	98	0	60	35	52	60	35	50	60	100	0
B. eggerchii	58	95	0	58	100	0	58	98	2	58	100	0	58	100	0	58	100	0	58	29	55	58	28	55	58	100	0
Parabacteroides distasonis	111	69	11	111	91	2	111	41	16	111	97	0	111	100	0	111	99	0	111	30	41	111	54	38	111	100	0
B. fragilis group without B. fragilis	708	83	4	708	93	1	708	40	12	708	97	1	708	99	0	708	99	0	708	33	42	708	43	40	708	100	0
All 7 species listed	1580	86	4	1580	95	2	1580	65	9	1580	97	1	1580	98	1	1580	98	1	1580	50	39	1580	49	39	1580	100	0

^aThe following antimicrobials were tested: Ampicillin-sulbactam (A/S), Piperacillin-Tazobactam (P/T), Cefoxitin (FOX), Ertapenem (ETP), Imipenem (IPM), Meropenem (MEM), 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.