Table 2.
Incidence risk ratea for Mycoplasma bovis-associated disease and mortality between 3 and 90 days of age in calves in the three study herds.
| Herd A | Herd B | Herd C | |
|---|---|---|---|
| Disease | |||
| All M. bovis-associated | 0.00 | 0.55 | 0.74 |
| Otitis media | 0.00 | 0.22 | 0.35 |
| Respiratory disease | 0.00 | 0.48 | 0.69 |
| Arthritis | 0.00 | 0.04 | 0.00 |
| Other | 0.07 | 0.15 | 0.19 |
| Mortality | |||
| M. bovis-associated | 0.00 | 0.10 | 0.03 |
| All causes | 0.02 | 0.13 | 0.10 |
a
Incidence risk rate: no. of calves that developed the disease of interest/initial no. of calves − 1/2 no. of calves died for reasons other than disease of interest.