Table 4 In vitro susceptibility of 9 strains of Streptococcus dysgalactiae obtained from clinical and sub-clinical bovine mastitis cases from the West Littoral Region of Uruguay.
MIC1 (μg/ml) | % Resistance | |||||
|---|---|---|---|---|---|---|
Antimicrobial Agent | MIC502 | MIC903 | Range | Breakpoint | VETMIC | Agar disk diffusion test |
Penicillin | ≤ 0.06 | 0.12 | ≤ 0.06–0.12 | ≥ 4 | 0.0 | 0.0 |
Ampicillin | ≤ 0.12 | 0.25 | ≤ 0.12–0.25 | ≥ 8 | 0.0 | 0.0 |
Cephalotin | ≤ 4 | ≤ 4 | ≤ 4 | ≥ 32 | 0.0 | 0.0 |
Gentamicin | 8 | 8 | 4–8 | ≥ 16 | 0.0 | 0.0 |
Erythromycin | ≤ 0.25 | ≤ 0.25 | ≤ 0.25 | ≥ 1 | 0.0 | 0.0 |
Oxitetracycline | 8 | > 64 | 4–> 64 | ≥ 8 | 89.0 | 89.0 5 |
Trimethoprim/Sulfamethox. | 0.12 | 0.25 | ≤ 0.06–0 | ≥ 4 | 0.0 | ....4.... |