TABLE 2.
L. monocytogenes susceptibility profile during 1991 to 1997a
| Antimicrobial agent | No. of isolates | MIC50 (μg/ml) | MIC90 (μg/ml) |
|---|---|---|---|
| Penicillin | 24 | 0.25 | 0.5 |
| Ampicillin | 24 | 0.25 | 1 |
| Oxacillin | 24 | 2 | ≥4.0 |
| Timentin | 24 | ≤1.0 | 4 |
| Cefazolin | 21 | ≤2.0 | ≤2.0 |
| Cephalothin | 24 | ≤2.0 | ≤2.0 |
| Cefuroxime | 24 | ≥32.0 | ≥32.0 |
| Cefotaxime | 21 | 16 | ≥64.0 |
| Ceftriaxone | 21 | 32 | ≥64.0 |
| Clindamycin | 24 | ≥4.0 | ≥4.0 |
| Erythromycin | 24 | ≤0.25 | ≤0.25 |
| Tetracycline | 24 | ≤2.0 | ≤2.0 |
| Chloramphenicol | 24 | ≤4.0 | 8 |
| Gentamicin | 24 | ≤1.0 | ≤1.0 |
| Amikacin | 24 | ≤16.0 | ≤16.0 |
| Rifampin | 21 | ≤1.0 | ≤1.0 |
| Nitrofurantoin | 21 | 64 | ≥64.0 |
| TMP-SMX | 24 | ≤2 and 38 | ≤2 and 38 |
| Vancomycin | 24 | ≤2.0 | ≤2.0 |
| Ciprofloxacin | 21 | ≤1.0 | ≤1.0 |
| Imipenem | 21 | ≤1.0 | ≤1.0 |
a
Timentin, ticarcillin-clavanulate. MIC50 and MIC90, MIC at which 50 and 90%, respectively, of the isolates tested are inhibited.