Table 6.
Essential agreement and error rates for automated antimicrobial test systems versus the CLSI reference broth microdilution methoda
| Automated system | Organism(s) | n (no. NS) | % EA | % CA | % ME | % VME | Reference |
|---|---|---|---|---|---|---|---|
| BD Phoenix | E. faecalis | 39 (4) | 82 | 87 | 14.2 | 0 | 236 |
| E. faecium | 46 (22) | 98 | 100 | 0 | 0 | 236 | |
| S. aureus | 63 (26) | 98 | 100 | 0 | 0 | 236 | |
| CoNS | 26 (1) | 100 | 100 | 0 | 0 | 236 | |
| MicroScan | E. faecalis | 1311 (0) | NR | 99.6 | 0.4 | 237 | |
| E. faecium | 362 (0) | NR | 91.2 | 8.8 | 237 | ||
| Enterococcus | 128 (17) | 91–94b | 88 | NR | NR | 238 | |
| S. aureus | 161 (0) | 97.5 | 100 | 0 | 191 | ||
| Vitek 2 | Enterococcus faecium | 30 (3) | NR | 100 | 0 | 239 | |
| CoNS | 100 (0) | 98 | 99 | 1 | 196 | ||
| S. aureus | 270 (20) | 80.7 | 95.4 | 5.4 | 10.7 | 196 | |
| S. aureus and S. agalactiae | 751 (19) | 97.2 | 96.8 | 3.0 | 3.3 | 240 | |
| Staphylococcus | 184 (0) | 98.2 | 100 | 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.