Table 1.
Interpretive criteria used to classify R. Equi isolates into the described antimicrobials.
Adapted from Berghaus et al. [41]
| Antimicrobials a | Breakpoint (mm) | ||
|---|---|---|---|
| Susceptible | Intermediary | Resistant | |
| Azithromycin (15mcg) | ≥ 18 | 14–17 | ≤ 13 |
| Clarithromycin (15mcg) | ≥ 18 | 14–17 | ≤ 13 |
| Erythromycin (15mcg) | 23 | 14–22 | ≤ 13 |
| Doxycycline (30 mcg) | ≥ 16 | 13–15 | ≤ 12 |
| Gentamicin (10mcg) | ≥ 16 | 13–15 | ≤ 12 |
| Rifampicin (5mcg) | ≥ 20 | 17–19 | ≤ 16 |
a Because there are still no interpretative criteria approved by CLSI for susceptibility testing on R. equi strains, CLSI interpretative criteria for Staphylococcus aureus were used as performed in the reference work [41]