Table 1 Data for experimental exposure groups and VLA scrapie flock cohorts.
From: The evaluation of exposure risks for natural transmission of scrapie within an infected flock
Exposure Group | Birth cohort | Dam status | Area(s) exposed to | Length of time exposed to infected environment | Type of contact with VLA scrapie flock sheep | Number in group at start of exposure | Number of clinical cases | Median survival time (days) | Range survival time (days) |
|---|---|---|---|---|---|---|---|---|---|
1 | 2003 | N | None | N/A | None | 7 | 0 | - | - |
2 | 2003 | N | All | 12 months | Direct | 4 | 3* | 792 | 747-792 |
3 | 2003 | N | Lambing pens | 6 weeks | Direct | 6 | 4* | 730 | 663-742 |
4 | 2003 | N | Lambing pens | 6 weeks | Indirect | 6 | 5* | 770 | 709-836 |
5 | 2002 | A | All | 6 weeks | Direct | 5 | 5 | 659 | 639-857 |
6 | 2002 | A | All | 3 months | Direct | 5 | 5 | 780 | 644-857 |
7 | 2002 | A | All | 12 months | Direct | 5 | 5 | 728 | 716-775 |
8 | 2003 | N | Pasture | 6 weeks | Indirect | 5 | 2 | - | 1094-1673 |
9 | 2003 | N | Pasture | 3 months | Indirect | 5 | 4 | 1299 | 836-1299 |
10 | 2002 | N | Pasture | 12 months | Indirect | 8 | 6* | 794 | 729-869 |
11 | 2003 | N | Pasture | 6 weeks | Direct | 5 | 5 | 817 | 728-1008 |
12 | 2003 | N | Pasture | 3 months | Direct | 5 | 4* | 776 | 684-791 |
13 | 2003 | N | Pasture | 12 months | Direct | 5 | 5 | 807 | 742-823 |
VLA scrapie flock | 2002 | A | All | Birth to clinical endpoint | Direct | 8 | 7* | 709 | 592-730 |
VLA scrapie flock | 2003 | A | All | Birth to clinical endpoint | Direct | 46 | 41* | 748 | 601-1184 |