A Case–Control Study on the Origin of Atypical Scrapie in Sheep, France
Alexandre Fediaevsky , Eric Morignat, Christian Ducrot, and Didier Calavas
Author affiliations: Agence Française de Sécurité Sanitaire des Aliments, Lyon, France (A. Fediaevsky, E. Morignat, D. Calavas); Institut National de la Recherche Agronomique, Clermont-Theix, France (A. Fediaevsky, C, Ducrot)
Figure 3. Distribution of control weightings calculated as the ratio of the percentage of flocks with >20 ewes in the county over the average percentage of flocks with >20 ewes for atypical scrapie in sheep, in France, 2007. Ranges represent classes of weightings.
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