Table 2.
Microbiologic Characteristics of 583 MRSA Isolates Causing Bloodstream Infections
| Characteristic | ST5 (n = 431) | ST72 (n = 152) | P |
|---|---|---|---|
| agr dysfunction | 414 (96.1) | 15 (9.9) | <.001 |
| Vancomycin MIC by BMD | |||
| ≤1.0 mg/L | 302 (70.1) | 136 (89.5) | <.001 |
| 1.5 mg/L | 117 (27.1) | 15 (9.9) | <.001 |
| ≥2.0 mg/L | 12 (2.8) | 1 (0.7) | .127 |
| Resistance to: | |||
| Clindamycin | 422 (97.9) | 33 (21.7) | <.001 |
| Ciprofloxacin | 427 (99.1) | 13 (8.6) | <.001 |
| Erythromycin | 426 (98.8) | 39 (25.7) | <.001 |
| Fusidic acid | 372 (86.3) | 2 (1.3) | <.001 |
| Gentamicin | 339 (78.7) | 14 (9.2) | <.001 |
| Rifampin | 41 (9.5) | 2 (1.3) | .001 |
| Trimethoprim/sulfamethoxazole | 9 (2.1) | 1 (0.7) | .243 |
Abbreviations: BMD, broth microdilution method; MIC, minimum inhibitory concentration; MRSA, methicillin-resistant Staphylococcus aureus.