Table 2.
Maximum and minimum possible durations of chronic wasting disease (CWD) measured in various groups of infected and suspect elk on game farms in Saskatchewan
| Group | Clinical status | Observations | Mean (months) | Standard deviation (months) | Range (months) |
|---|---|---|---|---|---|
| Maximum durations | |||||
| Residentsa | Preclinical | 155 | 36.0 | 23.0 | 4–137 |
| Trace-insb | Preclinical | 36 | 52.3 | 31.8 | 17–149 |
| Residents | Clinical | 21 | 46.7 | 33.8 | 22–135 |
| Trace-ins | Clinical | 11 | 42.8 | 15.3 | 21–79 |
| Minimum durations | |||||
| Trace-ins | Preclinical | 37 | 18.1 | 4.9 | 7–27 |
| Trace-ins | Clinical | 11 | 23.5 | 10.8 | 1–39 |
| Trace-ins | Suspected | ||||
| CWD death | 25 | 18.8 | 13.1 | 0–57 | |
a
Resident animals were either born on the farm or acquired from a farm not involved in the CWD outbreak and were believed to have become infected on their home farm
b
Trace-ins were moved from an infected farm to a previously uninfected farm, where they were diagnosed as CWD-positive and believed to have become infected on their farm of origin