Volume 15, Number 5—May 2009
Research
A Case–Control Study on the Origin of Atypical Scrapie in Sheep, France
Alexandre Fediaevsky
, Eric Morignat, Christian Ducrot, and Didier Calavas
, Eric Morignat, Christian Ducrot, and Didier Calavas
Table 3
Univariate analyses of contact with sheep from other flocks and afterbirth exposure variables conditional to C0 for atypical scrapie in sheep, France*
| Variable | Controls | Cases | Odds ratio | p value |
|---|---|---|---|---|
| Contact with other flocks during C0–C2006 | ||||
| No | 189 | 79 | 1.1 | 0.85 |
| Yes | 36 | 16 | ||
| Purchase of rams during C0–C2006 | ||||
| No | 30 | 17 | 0.7 | 0.29 |
| Yes | 195 | 78 | ||
| Purchase of ewes during C0–C2006 | ||||
| No | 139 | 68 | 0.6 | 0.10 |
| Yes | 86 | 27 | ||
| No. flocks of origin of ewes purchased during C2005–C2006 | ||||
| 0 | 139 | 68 | 1.0 | 0.22 |
| 1 | 35 | 13 | 0.8 | |
| 2 | 25 | 9 | 0.7 | |
| >4 | 26 | 5 | 0.4 | |
| Disposal of placenta in C0 | ||||
| Never | 82 | 37 | 1.0 | 0.51 |
| Sometimes | 36 | 19 | 1.2 | |
| Always | 107 | 39 | 0.8 | |
| Use of adoption cases in C0 | ||||
| No | 41 | 12 | 1.5 | 0.22 |
| Yes | 184 | 83 | ||
*C0, birth cohort assuming that in each flock all animals born during the same birth campaign (defined from July 1 of year n – 1 to June 30 of year n) shared the same exposure; C2006, birth campaign 2006; C2005, birth campaign 2005.
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