The Performance of Direct Disk Diffusion for Community Acquired Bacteremia due to Gram-Negative Bacilli and Its Impact on Physician Treatment Decisions

Table 2

Agreement between direct and standard susceptibility.

Antibiotic	Agreement (/%)	Very major error rate (/%); (falsely reporting resistant isolates as susceptible)	Major error rate (/%); (falsely reporting susceptible isolates as resistant)	Minor error rate (/%); (falsely reporting intermediate isolates as susceptible or resistant or vice versa)	Missing data (/%)
Ampicillin	69 (77.5)	5 (5.6)	3 (3.4)	10 (11.2)	2 (2.2)
Gentamicin	86 (96.6)	0 (0)	0 (0)	1 (1.1)	2 (2.2)
Ciprofloxacin	84 (94.4)	0 (0)	0 (0)	3 (3.4)	2 (2.2)
Cefazolin	36 (40.4)	13 (14.6)	8 (9.0)	24 (30.0)	8 (9.0)
Cefotaxime	81 (91.0)	1 (1.1)	0 (0)	7 (7.9)	0 (0.0)
Amoxicillin/clavulanic acid	47 (52.8)	18 (20.2)	3 (3.4)	12 (13.5)	9 (10.1)
Piperacillin/tazobactam	69 (77.5)	4 (4.4)	1 (1.1)	10 (11.2)	5 (5.6)
Ceftazidime	77 (86.5)	2 (2.2)	0 (0)	2 (2.2)	8 (9.0)
Trimethoprim/sulfamethoxazole	71 (79.8)	0 (0)	4 (4.4)	5 (5.6)	9 (10.1)
Imipenem	76 (85.4)	1 (1.1)	0 (0)	1 (1.1)	11 (12.4)
Tobramycin	75 (84.3)	0 (0)	0 (0)	2 (2.2)	12 (13.5)