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Table 7 Likelihood of identifying resistance among NTSEC isolates cultured from feces collected as composite pen floor samples or as individual samples collected per rectum on the same sampling days 1,2

From: Methodological comparisons for antimicrobial resistance surveillance in feedlot cattle

Resistance outcome3

Type of fecal sample

OR4

95% CI5

P-value

Ampicillin

Individual

0.8

0.3 – 1.8

0.58

 

Composite

Reference

  

Chloramphenicol

Individual

0.9

0.4 – 2.5

0.94

 

Composite

Reference

  

Kanamycin

Individual

0.6

0.2 – 2.5

0.5

 

Composite

Reference

  

Nalidixic Acid

Individual

3.5

0.3 – 44.8

0.41

 

Composite

Reference

  

Streptomycin

Individual

1.3

0.8 – 2.2

0.31

 

Composite

Reference

  

Sulfisoxazole

Individual

1.2

0.7 – 2.2

0.5

 

Composite

Reference

  

Tetracycline

Individual

0.9

0.6 – 1.7

0.92

 

Composite

Reference

  

Trimethoprim- Sulfamethoxazole

Individual

1.7

0.4 – 8.5

0.5

Composite

Reference

  
  1. 1n=412 isolates recovered from 137 fecal samples collected from individual cattle, and n=198 isolates recovered from 40 composite pen floor fecal samples.
  2. 2Susceptibility testing was performed using broth microdilution.
  3. 3Other drugs could not be analyzed because of low resistance prevalence (amikacin, amoxicillin-clavulanate, cefoxitin, ceftiofur, ceftriaxone, ciprofloxacin, gentamicin, and nalidixic acid).
  4. 4 Odds Ratio. Analyses controlled for potential lack of independence related to repeated measures and hierarchical data structure using generalized estimating equations.
  5. 595% confidence intervals.
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BMC Veterinary Research

ISSN: 1746-6148

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