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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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