Skip to main content

Table 5 Likelihood of identifying resistance in isolates of NTSEC or M Haemolytica when tested using disk diffusion versus broth microdilution

From: Methodological comparisons for antimicrobial resistance surveillance in feedlot cattle

Resistance outcome

Susceptibility testing method

NTSEC (n=3362)

M. haemolytica(n=1574)

OR1

95% CI2

P-value

OR1

95% CI2

P-value

Ampicillin

DD3

6.3

2.9 – 14.3

<0.0001

20.0

5.0 – 100

<0.0001

 

BM4

ref

  

ref

  

Amoxicillin-Clavulanate

DD

−5

–

–

10.0

3.0 – 33.3

0.0001

 

BM

   

ref

  

Ceftiofur

DD

5.6

1.2 – 25.0

0.03

−5

–

–

 

BM

ref

     

Streptomycin

DD

2.0

1.6 – 2.7

<0.0001

−5

–

–

 

BM

ref

     

Sulfisoxazole

DD

1.3

0.9 – 1.9

0.11

−5

–

–

 

BM

ref

     

Tetracycline

DD

0.6

0.5 – 0.8

0.0003

25.0

7.7 – 100

<0.0001

 

BM

ref

  

ref

  

TMS6

DD

4.8

2.0 – 11.1

0.0004

−5

–

–

 

BM

ref

     
  1. 1Odds ratio comparing disk diffusion to broth microdilution as the reference category.
  2. 295% confidence intervals determined using Wald statistics.
  3. 3Disk Diffusion.
  4. 4Broth Microdilution.
  5. 5Model was not stable because of low resistance prevalence.
  6. 6Trimethoprim-Sulfamethoxazole.
Back to article page

BMC Veterinary Research

ISSN: 1746-6148

Contact us