Table 2.
Antimicrobial susceptibility of Salmonella from food-producing animals
| Antimicrobials | Resistant breakpoint (μg/mL) | MIC range (μg/mL) | MIC50 (μg/mL) | MIC90 (μg/mL) | No. of resistant isolates (%) | |||||||
| Broiler (n = 111) |
Pigs (n = 10) |
Cattle (n = 1) |
Total (n = 122) |
|||||||||
| Ampicillin | 25 | 0.39->100 | 1.56 | 3.13 | 4 | (3.6) | 5 | (50) | 0 | (0) | 9 | (7.4) |
| Ceftiofur | 6.25 | 0.2–25 | 0.78 | 1.56 | 2 | (1.8) | 0 | (0) | 0 | (0) | 2 | (1.6) |
| Apramycin | 0.39–12.5 | 1.56 | 3.13 | |||||||||
| Dihydrostreptomycin | 100 | 6.25->100 | >100 | >100 | 88 | (79.3) | 6 | (60) | 1 | (100) | 95 | (77.9) |
| Kanamycin | 25 | 0.39->100 | 1.56 | >100 | 49 | (44.1) | 0 | (0) | 1 | (100) | 50 | (41.0) |
| Gentamicin | 0.1–3.13 | 0.39 | 0.78 | |||||||||
| Oxytetracycline | 25 | 3.13->100 | >100 | >100 | 93 | (83.8) | 6 | (60) | 1 | (100) | 100 | (82.0) |
| Bicozamycin | 100 | 12.5->400 | 25 | 25 | 8 | (7.2) | 0 | (0) | 0 | (0) | 8 | (6.6) |
| Chloramphenicol | 50 | 0.78->100 | 3.13 | 6.25 | 0 | (0) | 4 | (40) | 0 | (0) | 4 | (3.3) |
| Colistin | 0.39–3.13 | 0.78 | 1.56 | |||||||||
| Nalidixic acid | 25 | 3.13->100 | 3.13 | 6.25 | 6 | (5.4) | 0 | (0) | 0 | (0) | 6 | (4.9) |
| Enrofloxacin | ≤0.05–0.39 | ≤0.05 | 0.1 | |||||||||
| Ofloxacin | ≤0.05–0.78 | 0.1 | 0.2 | |||||||||
| Trimethoprim | 3.13 | 0.1–6.25 | 0.39 | 6.25 | 42 | (37.8) | 1 | (10) | 0 | (0) | 43 | (35.2) |
| Sulfadimethoxine | 100->1600 | >1600 | >1600 | |||||||||