TABLE 1.
Agreement between the oxacillin E-test, the ATB Staph, the Rapid ATB Staph, and the Vitek systems and the reference methods (PCR amplification of the mecA gene and oxacillin agar screening) for S. aureus and coagulase-negative staphylococcal isolates
| Reference method | Isolate | No. of strains with concordant results (% agreement) for indicated system
|
|||
|---|---|---|---|---|---|
| E-test | ATB Staph | Rapid ATB Staph | Vitek | ||
| PCR of mecA | S. aureus | 61 (95.3) | 57 (89.0) | 49 (76.6) | 61 (95.3) |
| Coagulase-negative staphylococci | 51 (67.1) | 44 (57.9) | —a | 61 (80.3) | |
| Agar screening | S. aureus | 63 (98.4) | 59 (92.2) | 51 (79.7) | 63 (98.4) |
| Coagulase-negative staphylococci | 55 (72.4) | 48 (63.2) | — | 65 (85.5) | |
a
—, not tested.