Table 2.
Antibacterial activity of shikonin (SKN), ampicillin, and oxacillin against eight S. aureus strains.
| Bacterial strains | Class | mec A gene | β-lactamase activity | MIC (μg/mL) | ||
|---|---|---|---|---|---|---|
| SKN | Ampicillin | Oxacillin | ||||
| ATCC 33591 | MRSA | + | + | 15.6 | 125 | >250 |
| ATCC 25923 | MSSA | − | − | 7.8 | 0.9 | 1.9 |
| Clinical isolates | ||||||
| KWMrI 1039a | MRSA | + | + | 7.8 | 31.2 | >250 |
| KWMrI 1040 | MRSA | + | − | 15.6 | 31.2 | >250 |
| KWMrI 1041 | MRSA | + | + | 15.6 | 62.5 | >250 |
| KWMrI 1046 | MRSA | + | + | 31.2 | 250 | >250 |
| KWMrI 1047 | MRSA | + | + | 7.8 | 125 | >250 |
| KWMrI 1048 | MRSA | + | − | 31.2 | 62.5 | >250 |
MSSA, methicillin-susceptible S. aureus; MRSA, methicillin-resistant S. aureus; KWMrI (a), MRSA strains from the Department of Plastic Surgery, Wonkwang University Hospital.