Table 1. Antimicrobial susceptibility of ST25 S. suis strains used in this study.
| Antimicrobial agent | N° of susceptible strainsa (%) | N° of strains with intermediate resistanceb (%) | N° of resistant strainsc (%) |
|---|---|---|---|
| Ampicillin | 51 (100) | 0 (0) | 0 (0) |
| Ceftiofur | 51 (100) | 0 (0) | 0 (0) |
| Florfenicol | 0 (0) | 51 (100) | 0 (0) |
| Enrofloxacin | 35 (69) | 15 (29) | 1 (2) |
| Tetracycline | 1 (2) | 1 (2) | 49 (96) |
| Penicillin | 51 (100) | 0 (0) | 0 (0) |
| Erythromycin | 1 (2) | 0 (0) | 50 (98) |
a Susceptible MICs for ampicillin, ceftiofur, florfenicol, enrofloxacin, tetracyline, penicillin, and erythromycin are ≤0.5, ≤2, ≤2, ≤0.5, ≤0.5, ≤0.06, and ≤0.25 μg/mL, respectively.
b Intermediate MICS for ampicillin, ceftiofur, florfenicol, enrofloxacin, tetracyline, penicillin, and erythromycin are 1, 4, 4, 1, 1, 0.12–1, and 0.5 μg/mL, respectively.
c Resistance MICs for ampicillin, ceftiofur, florfenicol, enrofloxacin, tetracyline, penicillin, and erythromycin are ≥2, ≥8, ≥8, ≥2, ≥2, ≥2, and ≥1 μg/mL, respectively.