Rapid antimicrobial susceptibility testing on positive blood cultures through an innovative light scattering technology: performances and turnaround time evaluation

Table 3 AST results with Alfred 60^AST compared to direct Phoenix for Gram-negative bacteria during Period II

Antibiotic	Categorical agreement (%)	Very major errors (%)	Major errors (%)	Minor errors (%)
Cefuroxime^a	51/52 (98.1)	0/7	1/45 (2.2)	NA
Ceftazidime EB	68/84 (81)	0/8	9/74 (12.2)	7/84 (8.3)
Piperacillin-tazobactam EB^a	58/61 (95.1)	0/4	2/56 (3.6)	1/61 (1.6)
Ceftazidime PA	5/6 (83.3)	0/3	1/3 (33.3)	NA
Ciprofloxacin	88/90 (97.7)	0/16	0/73	2/90 (2.2)
Total	270/293 (92.2)	0/38 (0)	13/251 (5.2)	10/235 (4.3)

EB Enterobacteriaceae, NA not applicable (no intermediate zone), PA Pseudomonas
^aModified antibiotic reagent

ISSN: 1471-2334