Table 2.
Resistance and distribution of MIC for Streptococcus dysgalactiae (n = 50) and Streptococcus uberis (n = 50).
| Distribution (%) of MICs a (mg/l) | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Substance | Species | Resistance (%) |
≤0.03 | 0.06 | 0.12 | 0.25 | 0.5 | 1 | 2 | 4 | 8 | 16 | 32 | 64 | >64 |
| Cephalothin | S. dysg. | - | 2.0 | 82.0 | 16.0 | ||||||||||
| S. uberis | - | 4.0 | 50.0 | 42.0 | 2.0 | 2.0 | |||||||||
| Chloramphenicol | S. dysg. | - | 6.0 | 28.0 | 66.0 | ||||||||||
| S. uberis | - | 36.0 | 62.0 | 2.0 | |||||||||||
| Ciprofloxacin | S. dysg. | - | 10.0 | 48.0 | 40.0 | 2.0 | |||||||||
| S. uberis | - | 4.0 | 54.0 | 40.0 | 2.0 | ||||||||||
| Clindamycin | S. dysg. | - | 100 | ||||||||||||
| S. uberis | - | 100 | |||||||||||||
| Erythromycin | S. dysg. | - | 100 | ||||||||||||
| S. uberis | - | 100 | |||||||||||||
| Gentamicin | S. dysg. | - | 12.0 | 24.0 | 62.0 | 2.0 | |||||||||
| S. uberis | - | 20.0 | 20.0 | 28.0 | 30.0 | 2.0 | |||||||||
| Kanamycin | S. dysg. | - | 2.0 | 4.0 | 4.0 | 4.0 | 12.0 | 68.0 | 6.0 | ||||||
| S. uberis | - | 6.0 | 6.0 | 18.0 | 20.0 | 50.0 | |||||||||
| Penicillinc | S. dysg. | - | 72.0 | 18.0 | 10.0 | ||||||||||
| S. uberis | - | 46.0 | 34.0 | 14.0 | 6.0 | ||||||||||
| Tetracycline | S. dysg. | - | 4.0 | 14.0 | 70.0 | 8.0 | 2.0 | 2.0 | |||||||
| S. uberis | - | 86.0 | 2.0 | 4.0 | 4.0 | 4.0 | |||||||||
| Trimethoprim | S. dysg. | - | 14.0 | 36.0 | 46.0 | 4.0 | |||||||||
| S. uberis | - | 20.0 | 64.0 | 14.0 | 2.0 | ||||||||||
a Thin vertical lines denote range of dilutions tested for each substance. MICs above the range are given as the concentration closest to the range. MICs equal to or lower than the lowest concentration tested are given as the lowest tested concentration. Bold vertical lines indicate EUCAST epidemiological cut-off values. When no cut-off value is available isolates are not classified as susceptible or resistant.