Table 5 In vitro susceptibility of 33 strains of Streptococcus uberis 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 | 16 | > 16 | ≤ 1–> 16 | ≥ 16 | 88.0 | 83.0 5 |
Erythromycin | ≤ 0.25 | ≤ 0.25 | ≤ 0.25 | ≥ 1 | 0.0 | 0.0 |
Oxitetracycline | ≤ 0.25 | 0.5 | ≤ 0.25–64 | ≥ 8 | 0.0 | 0.0 6 |
Trimethoprim/Sulfamethox. | 0.12 | 0.25 | ≤ 0.06–0.5 | ≥ 4 | 0.0 | ....4.... |