Table 6. Concordance of phenotypic and susceptibility results for all three organisms (64 isolates).
| Pheno: S | Pheno: R | |||||||
|---|---|---|---|---|---|---|---|---|
| Class | Antibiotic | Geno:R | Geno:S | Geno:R | Geno:S | Discordant (%) | Concordant (%) | P-Value |
| β-Lactam | Ampicillin | 4 | 42 | 15 | 3 | 11 | 89 | 0.73 |
| β-Lactam | Ceftiofur | 19 | 44 | 0 | 1 | 31 | 69 | <0.001 |
| β-Lactam | Penicillin | 4 | 41 | 15 | 4 | 13 | 88 | 0.99 |
| Tetracycline | Chlortetracycline | 53 | 1 | 10 | 0 | 83 | 17 | <0.001 |
| Tetracycline | Oxytetracycline | 1 | 1 | 62 | 0 | 2 | 98 | 0.50 |
| Fluoroquinolone | Danofloxacin | 0 | 44 | 0 | 20 | 31 | 69 | <0.001 |
| Fluoroquinolone | Enrofloxacin | 0 | 64 | 0 | 0 | 0 | 100 | 0.32 |
| Phenicol | Florfenicol | 24 | 26 | 14 | 0 | 38 | 63 | <0.001 |
| Aminoglycoside | Gentamicin | 0 | 52 | 0 | 12 | 19 | 81 | 0.002 |
| Aminoglycoside | Neomycin | 0 | 0 | 63 | 1 | 2 | 98 | 1.0 |
| Aminoglycoside | Spectinomycin | 0 | 64 | 0 | 0 | 0 | 100 | 0.37 |
| Sulfonamide | Sulfadimethoxine | 1 | 1 | 60 | 2 | 5 | 95 | 0.63 |
| Trimeth/Sulf | TMS | 33 | 21 | 7 | 3 | 56 | 44 | <0.001 |
| Pleuromutilin | Tiamulin | 0 | 40 | 0 | 24 | 37 | 63 | <0.001 |
| MLS | Clindamycin | 7 | 6 | 31 | 20 | 42 | 58 | 0.02 |
| MLS | Tilmicosin | 13 | 21 | 25 | 5 | 28 | 72 | 0.06 |
| MLS | Tulathromycin | 33 | 26 | 7 | 3 | 52 | 48 | <0.001 |
| MLS | Tylosin tartrate | 5 | 4 | 33 | 22 | 42 | 58 | <0.001 |
Pheno, phenotype; S, susceptible; R, resistant; Geno, genotype; Trimeth/Sulf, trimethoprim/sulfonamide; TMS, trimethoprim-sulfamethoxazole; MLS, macrolide-lincosamide-streptogramin.