Table 4.

Performance of DAST compared with reference AST method for GPC by VITEK-2 System

Organisms and antibiotic tested (n × Ab = N)	Categorical agreement, n (%)	Categorical disagreement, n (%) among isolate-antibiotic combinations tested				Essential agreement
		Minor error	Major error	Very major error	Total	Agreed	Disagreed
Staphylococcus spp. (49 × 15 = 735)	729 (99.2%)	3 (0.4%)	2 (0.27%)	1 (0.13%)	6 (0.8%)	732 (99.6%)	03 (0.4%)
Enterococcus spp. (16 × 15 = 240)	238 (99.2%)	0 (0.0%)	2 (0.8%)	0 (0.0%)	2 (0.8%)	238 (99.2%)	02 (0.8%)
Antibiotics tested (N = 65)	Categorical agreement, n (%)	Categorical disagreement (%)				Essential agreement
		Minor error	Major error	Very major error	Total	Agreed	Disagreed
Benzyl penicillin	65 (100.0%)	0 (0.0%)	0 (0.0%)	0 (0.0%)	0 (0.0%)	65 (100.0%)	0 (0.0%)
Tetracycline	65 (100.0%)	0 (0.0%)	0 (0.0%)	0 (0.0%)	0 (0.0%)	65 (100.0%)	0 (0.0%)
Teicoplanin	60 (92.3%)	3 (4.6%)	2 (3.1%)	0 (0.0%)	5 (7.7%)	63 (96.9%)	2 (3.1%)
Vancomycin	58 (89.2%)	3 (4.6%)	4 (6.2%)	0 (0.0%)	7 (10.8%)	62 (95.4%)	3 (4.6%)
Erythromycin	63 (96.9%)	0 (0.0%)	2 (3.1%)	0 (0.0%)	2 (3.1%)	65 (100.0%)	0 (0.0%)
Clindamycin	64 (98.5%)	0 (0.0%)	1 (1.5%)	0 (0.0%)	1 (1.5%)	65 (100.0%)	0 (0.0%)
Linezolid	65 (100.0%)	0 (0.0%)	0 (0.0%)	0 (0.0%)	0 (0.0%)	65 (100.0%)	0 (0.0%)
Levofloxacin	62 (95.4%)	3 (4.6%)	0 (0.0%)	0 (0.0%)	3 (4.6%)	64 (98.5%)	1 (1.5%)
Ciprofloxacin	62 (95.4%)	3 (4.6%)	0 (0.0%)	0 (0.0%)	3 (4.6%)	64 (98.5%)	1 (1.5%)
Cotrimoxazole	63 (96.9%)	0 (0.0%)	2 (3.1%)	0 (0.0%)	2 (3.1%)	65 (100.0%)	0 (0.0%)