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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.
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BMC Veterinary Research

ISSN: 1746-6148

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