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Table 6 Likelihood of identifying resistance among paired isolates of NTSEC and M haemolytica that were recovered from the same individuals on the same day (n=2190) 1

From: Methodological comparisons for antimicrobial resistance surveillance in feedlot cattle

Resistance outcome2 Organism OR3 95% CI4 P-value
Ampicillin NTSEC 3.1 2.0 - 4.8 <0.0001
  M. haemolytica Reference   
Kanamycin NTSEC 0.2 0.1 - 0.3 <0.0001
  M. haemolytica Reference   
Nalidixic acid NTSEC 4.0 0.8 - 20.0 0.08
  M. haemolytica Reference   
Streptomycin NTSEC 3.3 3.3 - 10.7 <0.0001
  M. haemolytica Reference   
Sulfisoxazole NTSEC 50.0 25.0 - 100.0 <0.0001
  M. haemolytica Reference   
Tetracycline NTSEC 33.3 50.0 - 100.0 <0.0001
  M. haemolytica Reference   
Trimethoprim- Sulfamethoxazole NTSEC 11.1 2.7 - 50.0 0.001
M. haemolytica Reference   
  1. 1Susceptibility testing was performed using broth microdilution.
  2. 2Other drugs could not be analyzed because of low resistance prevalence (amikacin, amoxicillin-clavulanate, cefoxitin, ceftiofur, ceftriaxone, chloramphenicol, ciprofloxacin, gentamicin, and nalidixic acid).
  3. 3Odds ratio.
  4. 495% confidence intervals determined using Wald statistics.