Table 4.
Average percentage of multisusceptible E. coli stains within all isolated E. coli strains in vaccinated (vacc.) and control, not vaccinated (not vacc.), birds in experiments 1 (F1 and F2) and 2 (F3).
| Farm | Week | Chicken house | Percent of susceptible isolates |
Average | ||
|---|---|---|---|---|---|---|
| Cycle 1 | Cycle 2 | Cycle 3 | ||||
| F1 | 3 | Vacc. | 0 | 88 | 100 | 62.671 |
| Not vacc. | 37.5 | 0 | 0 | 12.5 | ||
| 6 | Vacc. | 25 | 100 | 75 | 66.671 | |
| Not vacc. | 40 | 0 | 0 | 13.33 | ||
| F2 | 3 | Vacc. | 33 | 60 | 100 | 64.331 |
| Not vacc. | 0 | 0 | 11 | 3.67 | ||
| 6 | Vacc. | 60 | 62 | 100 | 741 | |
| Not vacc. | 0 | 0 | 0 | 0 | ||
| F3 | 6 | Vacc. | 75 | - | - | - |
| Not vacc. | 0 | - | - | - | ||
Abbreviation: E. coli, Escherichia coli.
1
Significant difference in percent of multisusceptible E. coli isolates from vaccinated birds, at different sampling points, in comparison to the control chickens on a farm.