Table 8.
Relative scrapie risks
| Culled flocks | British cases (1998-2002) | |||
|---|---|---|---|---|
|
Genotype |
Cases (Total tested) |
Cases/1000 |
Relative risk (Confidence bounds) |
Relative risk calculated from Ref. [7] |
| ARR/ARR | 0 (237) | 0.0 | 0.0 (0.0 -0.03) | 0.00 |
| ARR/AHQ | 0 (26) | 0.0 | 0.0 (0.0 -0.26) | 0.00 |
| ARR/ARQ* | 0 (409) | 0.0 | 0.0 (0.0 -0.02) | 0.00 |
| ARR/VRQ | 24 (875) | 27.4 | 0.10 (0.06-0.15) | 0.03 |
| AHQ/AHQ | 0 (32) | 0.0 | 0.0 (0.0 -0.21) | 0.02 |
| AHQ/ARQ* | 1 (192) | 5.2 | 0.02 (0.001-0.08) | 0.04 |
| AHQ/VRQ | 2 (26) | 76.9 | 0.27 (0.05-0.79) | 0.00 |
| ARQ*/ARQ* | 54 (1882) | 28.7 | 0.10 (0.08-0.14) | 0.13 |
| ARQ*/VRQ | 155 (553) | 280.3 | 1.00 (1.00-1.00) | 1.00 |
| VRQ/VRQ | 21 (57) | 368.4 | 1.31 (0.88-1.83) | 2.33 |
Cases found in different genotypes (including index case) in culled flocks, cases per 1000 animals of given genotype, and relative case risk rγ of the different genotypes (setting the risk of ARQ*/VRQ equal to unity). Comparison to the relative risks of death from scrapie in British sheep estimated by Baylis et al. [7]. The total number of cases in this Table is 257; three remaining cases were in animals for which the genotype could not be determined.