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Table 2 AST results with Alfred 60AST compared to direct Phoenix for Gram-negative bacteria during Period I

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

AntibioticCategorical agreement (%)Very major errors (%)Major errors (%)Minor errors (%)
Cefuroxime56/60 (93.3)4/21 (19)0/39NA
Ceftazidime EB58/68 (85.3)0/162/46 (4.3)8/68 (11.8)
Piperacillin-tazobactam EB56/69 (81.2)2/13 (15.4)4/51 (7.8)7/69 (10.1)
Ceftazidime PA4/5 (80)0/01/5 (20)NA
Ciprofloxacin74/75 (98.7)0/190/561/75 (1.3)
Total248/277 (89.5)6/69 (8.7)7/197 (3.6)16/212 (7.5)
  1. EB Enterobacteriaceae, NA not applicable (no intermediate zone), PA Pseudomonas