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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
  1. Dam status - N, naïve, TSE-free; A, scrapie affected.
  2. * 'Number of clinical cases' is different to 'Number in group at start of exposure' due to intercurrent deaths.