Table 6

Essential agreement and error rates for automated antimicrobial test systems versus the CLSI reference broth microdilution method a

Automated systemOrganism(s)n (no. NS)% EA% CA% ME% VMEReference
BD Phoenix E. faecalis 39 (4)828714.20 236
E. faecium 46 (22)9810000 236
S. aureus 63 (26)9810000 236
CoNS26 (1)10010000 236
MicroScan E. faecalis 1311 (0)NR99.60.4 237
E. faecium 362 (0)NR91.28.8 237
Enterococcus 128 (17)91–94 b 88NRNR 238
S. aureus 161 (0)97.51000 191
Vitek 2 Enterococcus faecium 30 (3)NR100 0 239
CoNS100 (0)98991 196
S. aureus 270 (20)80.795.45.410.7 196
S. aureus and S. agalactiae 751 (19)97.296.83.03.3 240
Staphylococcus 184 (0)98.2100 241
  • a NS, nonsusceptible; EA, essential agreement; CA, categorical agreement; ME, major error; VME, very major error; NR, not reported; CoNS, coagulase-negative Staphylococcus.

  • b Dependent on Prompt or turbidity methods of inoculum preparation.