GRAM-NEGATIVE ANAEROBIC BACTERIA RESISTANCE RATES
Period: January 2003 - June 2005

Species (No of strains)	Antimicrobial agent	% susceptibility c
		R	I	S
Total Gram-negative (249)	Penicillin	83	2	15
	Piperacillin+tazobactam	1	0	99
	Cefoxitin	9	17	74
	Imipenem	<1	0	99
	Clindamycin	25	6	69
	Metronidazole	3	1	95
	Tetracycline	55	4	41
Bacteroides fragilis group (158)	Penicillin	95	2	3
	Piperacillin+tazobactam	1	0	99
	Cefoxitin	15	22	63
	Imipenem	<1	0	99
	Clindamycin	23	8	69
	Metronidazole	0	1	99
	Tetracycline	63	4	33
Bacteroides fragilis (86)	Penicillin	99	0	1
	Piperacillin+tazobactam	1	0	99
	Cefoxitin	14	16	70
	Imipenem	1	0	99
	Clindamycin	15	7	78
	Metronidazole	0	1	99
	Tetracycline	60	3	37
Bacteroides thetaiotaomicron (20)	Penicillin	90	10	0
	Piperacillin+tazobactam	0	0	100
	Cefoxitin	10	35	55
	Imipenem	0	0	100
	Clindamycin	45	5	50
	Metronidazole	0	0	100
	Tetracycline	60	10	30
Bacteroides ovatus (15)	Penicillin	93	0	7
	Piperacillin+tazobactam	7	0	93
	Cefoxitin	20	27	53
	Imipenem	0	0	100
	Clindamycin	13	20	67
	Metronidazole	0	0	100
	Tetracycline	60	0	40
Bacteroides spp. non-fragilis (27)	Penicillin	93	0	7
	Piperacillin+tazobactam	0	0	100
	Cefoxitin	4	33	63
	Imipenem	0	0	100
	Clindamycin	30	4	66
	Metronidazole	0	0	100
	Tetracycline	70	4	26
Bacteroides capilossus (22)	Penicillin	100	0	0
	Piperacillin+tazobactam	0	0	100
	Cefoxitin	0	36	64
	Imipenem	0	0	100
	Clindamycin	27	5	68
	Metronidazole	0	0	100
	Tetracycline	77	5	18
Prevotella spp. (44)	Penicillin	66	2	32
	Piperacillin+tazobactam	0	0	100
	Cefoxitin	0	5	95
	Imipenem	0	0	100
	Clindamycin	27	5	68
	Metronidazole	16	0	84
	Tetracycline	39	2	59