Ann Clin Microbiol 2022;25:109-118. Clinical usefulness of the QMAC-dRAST system for AmpC β-lactamase-producing Enterobacterales
Table 4. Agreement & error rates between QMAC-dRAST and Vitek 2* for each antimicrobial agent
Antimicrobial agentsTotal No. of tested isolatesEA (%)CA (%)VME (%)ME (%)mE (%)
Amikacin80100.0100.0 0 0 0
Amoxicillin/Clavulanate8096.391.3 3.8 0 5.0
Ampicillin8098.898.8 050.0 0
Aztreonam8085.091.3 0 8.2 2.5
Cefazolin80100.098.8 0 0 1.3
Cefepime8093.891.3 0 2.9 6.3
Cefotaxime8092.587.5 0 6.0 8.8
Ceftazidime8088.893.8 0 3.6 3.8
Ciprofloxacin8097.593.8 0 1.4 5.0
Ertapenem80100.093.8 0 0 5.0
Gentamicin8098.898.8 0 1.3 0
Imipenem8095.083.813.3 1.812.5
Piperacillin/Tazobactam8085.081.3 8.3 017.5
Trimethoprim/Sulfamethoxazole8098.898.8 0 1.4 0
Total1,12095.093.0 1.7 2.3 4.9

*For results showing discrepancies between QMAC-dRAST and Vitek 2, BMD tests were used as the reference method to resolve discrepancies. Abbreviations: AST, antimicrobial susceptibility testing; EA, essential agreement; CA, categorical agreement; VME, very major error; ME, major error; mE, minor error.