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Table 4 Interpretive criteria for M haemolytica using disk diffusion susceptibility testing reported as inhibition zone diameters in (mm)

From: Methodological comparisons for antimicrobial resistance surveillance in feedlot cattle

Antimicrobial [Disk] (μg) Susceptible Intermediate Resistant Reference
Ampicillin 10 ≥27 - - CLSI M45-A2, 2010
Amoxicillin- Clavulanate 20/10 ≥27 - - CLSI M45-A2, 2010
Ceftiofur 30 ≥21 18-20 ≤17 CLSI M31-A3, 2008
Danofloxacin 5 ≥22 - - CLSI M31-A3, 2008
Enrofloxacin 5 ≥21 17-20 ≤16 CLSI M31-A4, 2013
Florfenicol 30 ≥19 15-18 ≤14 CLSI M31-A4, 2013
Gentamicin 10 ≥15 - ≤12 Catry et al., 2007
Spectinomycin 100 ≥14 11-13 ≤10 CLSI M31-A3, 2008
Sulfisoxazole 300 ≥17 13-16 ≤12 CLSI M31-A3, 2008
Tetracycline 30 ≥23 - - CLSI M45-A2, 2010
Tilmicosin 15 ≥14 11-13 ≤10 CLSI M31-A4, 2013
Trimethoprim-Sulfamethoxazole 1.25/23.75 ≥24 - - CLSI M45-A2, 2010
Tulathromycin 30 ≥18 15-17 ≤14 CLSI M31-A4, 2013
  1. CLSI = Clinical and Laboratory Standards Institute.