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Table 8 Relative scrapie risks

From: Scrapie prevalence in sheep of susceptible genotype is declining in a population subject to breeding for resistance

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
  1. Cases found in different genotypes (including index case) in culled flocks, cases per 1000 animals of given genotype, and relative case risk r γ 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.