TABLE 2.
Sensitivities and specificities of disk diffusion and Vitek 2 susceptibility testing methods for detection of methicillin resistance in S. aureus by category of phenotypic resistance expression
| Method | Sensitivity (%)
|
Specificity (%) for MSSA (n = 56) | ||
|---|---|---|---|---|
| All MRSA (n = 157) | Low-level MRSA (n = 29) | High-level MRSA (n = 128) | ||
| Vitek 2 AST-P549 | 97.5 | 89.65 | 99.2 | 100 |
| Disk diffusion | ||||
| Cefoxitin | ||||
| 10 μg (Rosco) | 99.6 | 96.4 | 100 | 100 |
| 30 μg (Rosco) | 99.6 | 96.4 | 100 | 100 |
| 60 μg (Rosco) | 98.7 | 92.9 | 100 | 100 |
| 30 μg (Oxoid) | 98.7 | 92.9 | 100 | 100 |
| Moxalactam 30 μg (Oxoid) | 98.7 | 92.9 | 100 | 100 |