TABLE 3.
Comparison of results with different reference plates and medium manufacturers by mecA and oxacillin MIC breakpoint
| Plate/medium | No. (%) of results with the indicated MIC (μg/ml) for:
|
|||||||
|---|---|---|---|---|---|---|---|---|
|
mecA-positive strains (n = 318)
|
mecA-negative strains (n = 230)
|
|||||||
| ≥4 | ≥2 | ≥1 | ≥0.5 | ≤2 | ≤1 | ≤0.5 | ≤0.25 | |
| CDC/Difco | 182 (57) | 260 (82) | 290 (91) | 298 (94) | 224a (99) | 211 (93) | 195 (86) | 166a (73) |
| MicroScan/Difco | 82 (26) | 145 (46) | 255 (80) | 299 (94) | 230 (100) | 218 (95) | 197 (86) | 171 (74) |
| CDC/Acumedia | 198 (62) | 240 (76) | 257 (81) | 267 (84) | 222b (98) | 216 (96) | 202 (89) | 175b (77) |
| MicroScan/BDMS | 143 (45) | 209 (66) | 272 (86) | 297 (93) | 230 (100) | 227 (99) | 211 (92) | 186 (81) |
a
n = 227. Differences were due to growth failures in some MIC plates.
b
n = 226. Differences were due to growth failures in some MIC plates.