Table 1.
Antimicrobial | Supplier | Supplier code | Disk content (μg) | Zone diameter (mm) breakpointsc | ||
---|---|---|---|---|---|---|
S | I | R | ||||
Amoxicillin/clavulanic Acida | BD | AMC-30 | 20/10 | ≥27 | n/a | ≤26 |
Ampicillina | BD | AM-10 | 10 | ≥27 | n/a | n/a |
Ceftiofurb | BD | XNL-30 | 30 | ≥21 | 18–20 | ≤17 |
Danofloxacinb | Pfizer | DNO | 5 | ≥22 | n/a | n/a |
Erythromycina | BD | E-15 | 15 | ≥27 | 25–26 | ≤24 |
Florfenicolb | BD | FF-30 | 30 | ≥19 | 15–18 | ≤14 |
Gentamicinb | BD | GM-10 | 10 | ≥15 | 13–14 | ≤12 |
Oxytetracyclinea | BD | T-30 | 30 | ≥23 | n/a | n/a |
Spectinomycinb | BD | SPT-100 | 100 | ≥14 | 11–13 | ≤10 |
Sulfamethoxazolea/trimethoprim | BD | SXT | 23.75/1.25 | ≤24 | n/a | n/a |
Tilmicosinb | BD | TIL-15 | 15 | ≥14 | 11–13 | ≤10 |
Tulathromycinb | Pfizer | TUL | 30 | ≥18 | 15–17 | ≤14 |
M45-A: Methods for antimicrobial dilution and disk susceptibility testing of infrequently isolated or fastidious bacteria; approved guideline (CLSI, 2008b). Due to the unavailability MIC breakpoints for Mannheimia spp., guidelines for Pasteurella spp. were followed.
M31-A3: Performance standard for antimicrobial disk and dilution susceptibility tests for bacteria isolated from animals; approved standard—third edition (CLSI, 2008a)
Zone diameter value used to indicate susceptible (S), intermediate (I) and resistant (R), n/a, not available.