TABLE 2.
Antimicrobial susceptibility of Salmonella sp. isolates (n = 91) from chicken farms in South Korea
| Antimicrobial agent | MIC (μg/ml) |
Resistance (%) | |||
|---|---|---|---|---|---|
| Range | MIC50 | MIC90 | Breakpoint | ||
| Amoxicillin | ≤2->1,024 | ≤2 | 1,024 | 32a | 18.7 |
| Ampicillin | ≤4->1,024 | ≤4 | 512 | 32a | 16.5 |
| Apramycin | 2-64 | 4 | 8 | 32c | 3.3 |
| Ceftiofur | ≤0.25->64 | 0.5 | 1 | 8c | 2.2 |
| Cephalothin | ≤1-256 | 4 | 8 | 32a | 4.4 |
| Chloramphenicol | 2->256 | 4 | 8 | 32a | 5.5 |
| Ciprofloxacin | ≤0.25-32 | ≤0.25 | ≤0.25 | 4a | 1.1 |
| Enrofloxacin | ≤0.25-2 | ≤0.25 | 1 | 2b | 1.1 |
| Florfenicol | 2->128 | 4 | 8 | 32c | 3.3 |
| Gentamicin | ≤0.5-128 | ≤0.5 | 1 | 8b | 4.4 |
| Nalidixic acid | 2->256 | >256 | >256 | 32a | 63.7 |
| Neomycin | ≤1-256 | ≤1 | 2 | 16c | 5.5 |
| Streptomycin | ≤1->256 | 8 | >256 | 32c | 38.5 |
| Sulfamethoxazole | 8->1,024 | >1,024 | >1,024 | 512a | 74.7 |
| Tetracycline | ≤1->256 | 2 | 256 | 16a | 28.6 |
| Trimethoprim | ≤1-256 | ≤1 | ≤1 | 16a | 4.4 |
a
The value was a CLSI (M100-S19; 2009) breakpoint.
b
The value was a CLSI (M31-A3; 2008) breakpoint.
c
The Danish Integrated Antimicrobial Resistance Monitoring and Research Programme (DANMAP) Report, 2006.