Table 3.
Minimum inhibitory concentration (MIC) of antibiotics against microorganisms
| Antibiotics | CLSI Break pointa | MIC (μg/ml) | ||||||
|---|---|---|---|---|---|---|---|---|
| S | I | R | P02 | P03 | P05 | P23 | O14 | |
| Penicillins | ||||||||
| Penicillin G | ≤0.12 | – | ≥0.25 | ≤0.06 | 0.12 | ≤0.06 | 0.25 | 0.25 |
| Ampicillin | ≤0.25 | – | ≥0.5 | ≤0.25 | 2 | ≤0.25 | 0.5 | 0.5 |
| Penicillins/ β-lactamase inhibitors | ||||||||
| Amoxicillin/clavulanate | ≤2/1 | 4/2 | ≥8/4 | ≤0.25/0.12 | 1/0.5 | ≤0.25/0.12 | ≤0.25/0.12 | ≤0.25/0.12 |
| Cephems | ||||||||
| Cefaclor | ≤1 | 2 | ≥4 | ≤2 | 4 | ≤2 | 16 | 8 |
| Cefazolin sodium | ≤2 | 4 | ≥8 | ≤0.5 | 1 | ≤0.5 | 1 | 2 |
| Anti-MRSA drugs | ||||||||
| Linezolid | ≤2 | – | ≥4 | 2 | 4 | 2 | 2 | 2 |
| Vancomycin | ≤1 | – | ≥2 | ≤0.5 | 8 | ≤0.5 | 1 | ≤0.5 |
aAmpicillin and cefazolin sodium used Vet-08 criteria, while M-100 criteria were used for the remaining antibiotics. S, sensitive; I, Intermediate; R, Resistant. CLSI, Clinical & Laboratory Standards Institute