TABLE 5.
Agent | MIC (μg/ml) | Control herds
|
Intervention herds
|
||||||
---|---|---|---|---|---|---|---|---|---|
% of isolatesa
|
Cochran-Mantel-Haenszel result
|
% of isolates
|
Cochran-Mantel-Haenszel result
|
||||||
Pre-Intb | Post-Intc | χ2 | P | Pre-Intd | Post-Inte | χ2 | P | ||
E. colif | 0.6 | 0.4494 | 10.1 | 0.0015 | |||||
4 | 1.3 | 2.1 | 2.0 | 9.3 | |||||
8 | 0 | 0.4 | 0 | 1.4 | |||||
16 | 0 | 0.7 | 2.0 | 1.7 | |||||
32 | 14.1 | 13.6 | 5.6 | 5.0 | |||||
>32 | 84.6 | 83.2 | 90.4 | 81.7 | |||||
Salmonellaf | 1.1 | 0.2889 | |||||||
4 | 0 | 0 | 21.4 | 45.4 | |||||
8 | 0 | 0 | 0 | 0 | |||||
16 | 0 | 0 | 0 | 0 | |||||
32 | 0 | 0 | 7.1 | 0 | |||||
>32 | 0 | 100.0 | 71.4 | 54.5 | |||||
Campylobacterg | 0.1 | 0.7238 | 1.6 | 0.2083 | |||||
2 | 0 | 8.3 | 0 | 7.7 | |||||
4 | 0 | 0 | 0 | 0 | |||||
8 | 0 | 0 | 0 | 0 | |||||
16 | 0 | 0 | 0 | 0 | |||||
32 | 0 | 0 | 0 | 0 | |||||
64 | 50.0 | 16.7 | 0 | 15.4 | |||||
>64 | 50.0 | 75.0 | 100 | 76.9 |
Pre-Int, preintervention; Post-Int, postintervention.
Numbers of isolates: E. coli, 156; Salmonella, 0; Campylobacter, 2.
Numbers of isolates: E. coli, 834; Salmonella, 144; Campylobacter, 12.
Numbers of isolates: E. coli, 197; Salmonella, 14; Campylobacter, 7.
Numbers of isolates: E. coli, 578; Salmonella, 11; Campylobacter, 13.
MIC: susceptible, <8 μg/ml; resistant, ≥32 μg/ml.
MIC: susceptible, <8 μg/ml; resistant, ≥16 μg/ml.