Table 1.
Antimicrobial susceptibility of S. epidermidis and S. haemolyticus isolates.
| Antimicrobial |
S. epidermidis |
S. haemolyticus |
||||||
|---|---|---|---|---|---|---|---|---|
| MIC50a (μg/mL) | MIC90b (μg/mL) | Resistant n (%) |
Susceptible n (%) |
MIC50a (μg/mL) | MIC90b (μg/mL) | Resistant n (%) |
Susceptible n (%) |
|
| Oxacillin | >0.5 | >0.5 | 72 (86.7) | 11 (13.3) | >0.5 | >0.5 | 55 (93.2) | 4 (6.8) |
| Vancomycin | 2 | 4 | 0 (0) | 83 (100) | 2 | 2 | 0 (0) | 59 (100) |
| Erythromycin | >4 | >4 | 66 (79.5) | 16 (19.3) | >4 | >4 | 53 (89.8) | 6 (10.2) |
| Tetracycline | ≤2 | >8 | 10 (12) | 71 (85.6) | ≤2 | >8 | 13 (22.0) | 44 (74.6) |
| Levofloxacin | >2 | >2 | 62 (74.7) | 18 (21.7) | >2 | >2 | 54 (91.5) | 4 (6.8) |
| Norfloxacin | >8 | >8 | 64 (77.1) | 18 (21.7) | >8 | >8 | 53 (89.8) | 6 (10.2) |
| Clindamycin | >2 | >2 | 68 (81.9) | 12 (14.5) | >2 | >2 | 53 (89.8) | 5 (8.5) |
| Trimethoprim/sulfamethoxazole | >2/38 | >2/38 | 60 (72.3) | 23 (27.7) | >2/38 | >2/38 | 45 (76.3) | 14 (23.7) |
| Linezolid | ≤2 | 4 | 3 (3.6) | 80 (96.4) | ≤2 | ≤2 | 2 (3.4) | 57 (96.6) |
Minimum inhibitory concentration (MIC) ranges, MIC50 and MIC90 were determined using the broth microdilution method. Panels from Sensititre (TEK Diagnostic Systems Inc.) were used according to the manufacturer's instructions.
a
MIC50, minimal inhibitory concentration for 50% of the isolates.
b
MIC90, minimum inhibitory concentration for 90% of the isolates.