Table 3.
Resistance to benzylpenicillin in staphylococcal isolates from milk samples in Norway, 2019 and 2020
| All samples, n (%) | Clinical mastitis, n (%) | |||
|---|---|---|---|---|
| Staphylococcus | Sensitive | Resistant | Sensitive | Resistant |
| Staphylococcus aureus | 10,405 (97.5) | 270 (2.5) | 3114 (98.4) | 52 (1.6) |
| Staphylococcus epidermidis | 268 (50.5) | 263 (49.5) | 183 (51.0) | 176 (49.0) |
| Staphylococcus chromogenes | 261 (78.9) | 70 (21.1) | 175 (78.1) | 49 (21.9) |
| Staphylococcus simulans | 266 (98.2) | 5 (1.9) | 204 (97.6) | 5 (2.4) |
| Staphylococcus haemolyticus | 39 (37.9) | 64 (62.1) | 26 (36.1) | 46 (63.9) |
| Other NASa | 579 (63.1) | 338 (36.9) | 417 (62.9) | 246 (37.1) |
aNon-aureus staphylococci other than S. epidermidis, S. chromogenes, S. simulans, S. haemolyticus