Table 3 In vitro susceptibility of 60 strains of Streptococcus agalactiae 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 | 0.12 | 0.12 | ≤ 0.06–0.12 | ≥ 4 | 0.0 | 0.0 |
Ampicillin | 0.25 | 0.25 | ≤ 0.12–0.25 | ≥ 8 | 0.0 | 0.0 |
Cephalotin | ≤ 4 | ≤ 4 | ≤ 4 | ≥ 32 | 0.0 | 0.0 |
Gentamicin | 8 | 16 | 4–16 | ≥ 16 | 85.0 | 85.0 |
Erythromycin | ≤ 0.25 | ≤ 0.25 | ≤ 0.25–1 | ≥ 1 | 3.4 | 3.4 |
Oxitetracycline | ≤ 0.25 | 0.5 | ≤ 0.25–2 | ≥ 8 | 0.0 | 0.0 5 |
Trimethoprim/Sulfamethox. | 0.25 | 0.25 | ≤ 0.06–2 | ≥ 4 | 0.0 | ....4.... |