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Table 3 Incidence rate ratios of diarrhea cases in pigs shedding E. coli with different virulence factors

From: Post-weaning diarrhea in pigs weaned without medicinal zinc: risk factors, pathogen dynamics, and association to growth rate

 

Cases/pig days

Incidence rate ratio

95% Confidence Interval

Std. Err

p value

Baseline incidence rate (constant)

 

0.06

0.03

0.11

0.02

5.5e−22

Producer

 Producer A

12/415

1.00 (base)

 

 Producer B

18/385

3.78

1.85

12.83

2.41

0.001

Virulence factors

 H+, F+T+

17/209

1.00 (base)

    

 H+, F−, T+

1/5

1.87

0.25

14.24

1.94

0.544

 H+, F+, T−

11/150

0.25

0.09

0.68

0.13

0.007

 H+, F−, T−

2/48

0.10

0.033

0.01

0.11

0.033

 H−

0/361

NAa

    
  1. Incidence rate ratios were estimated with a Poisson regression model. E. coli was cultured from rectal swabs collected from a cohort of piglets raised at two commercial Danish indoor producers. Data was included from the seventh to the 14th day after insertion to the nursery units
  2. H+/H−, hemolytic E. coli positive/negative; F+/F−, fimbria positive/negative; T+/T−, toxin positive/negative
  3. aIncidence rate was 0