| |
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
| | | | |
- 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
- H+/H−, hemolytic E. coli positive/negative; F+/F−, fimbria positive/negative; T+/T−, toxin positive/negative
- aIncidence rate was 0
