Figure 3From: No temporal trends in the prevalence of atypical scrapie in British sheep, 2002–2006Estimated prevalence of atypical scrapie per 100 animals tested as part of the abattoir survey for each year stratified by PrP genotype. (a) 2002, (b) 2003, (c) 2004, (d) 2005 and (e) 2006. Symbols show the estimates, and error bars the 95% confidence limits calculated using the Wilson score interval.Back to article page