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Table 1 AST results of the Alfred 60AST™ system compared to BD Phoenix™ system for each antibiotic. Column 2 shows the total number of susceptibility tests done with both methods; columns 3 to 6 the total number of tests for which there was agreement within each category and in total; columns 8 to 10 the number of discrepancies; S = susceptible = intermediate, R = resistant, CA = Categorical agreement, 95% CI = 95% confidence interval

From: Evaluation of a new Rapid Antimicrobial Susceptibility system for Gram-negative and Gram-positive bloodstream infections: speed and accuracy of Alfred 60AST

  No. of category agreementsNo. of discrepancies
Antimicrobial agentNo. of AST resultsSRICA TotalCA % (95% CI)MinorMajorVery major
Gram-negative antimicrobials
 Ampicillin30188202029096 (94–98)047
 Amikacin2982732227793 (89–96)3171
 Ciprofloxacin29722261028395 (92–97)176
 Ceftriaxone78641107596 (89–99)012
 Gentamicin29724038127994 (91–96)1107
 Piperacillin/Tazobactam29526316128095 (92–97)0105
 Meropenem2972844028897 (94–99)063
 Overall agreement186314343344177295 (94–96)5 (0.3%)55 (3%)31 (2%)
Gram-positive antimicrobials
 Cefoxitin75343506992 (83–97)042
 Cindamycin75411726080 (69–88)195
 Teicoplanin8679017992 (84–97)160
 Vancomycin8676107790 (81–95)090
 Ampicillin119101090 (59–100)010
 Overall agreement33323954329589 (85–92)2 (0.6%)29 (9%)7 (2%)