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Estimated prevalence of atypical scrapie in GB per 100 animals tested as part of the abattoir and fallen stock surveys, between 2002 and 2006, or 2003 and 2006, respectively. (a) by year; (b) by PrP genotype in the abattoir surveys; and (c) by PrP genotype in the fallen stock surveys. Symbols show the estimates, and error bars the 95% confidence limits calculated using the Wilson score interval.
