Key result
Flock-level risk factors for scrapie included specific geographic regions, purebred flock type, larger flock size at high stocking density, and specific lambing and purchasing practices.
Cross-Sectional (n=2,511)
The 2002 survey identified similar risk factors for scrapie as the 1998 survey, with differences in region and purchasing behavior likely due to farmer awareness and the 2001 foot-and-mouth disease epidemic.
May guide targeted scrapie surveillance in GB purebred flocks; leaves open causal factors and needs prospective validation before practice change.
BACKGROUND: In November 2002, an anonymous postal survey of sheep farmers in Great Britain (GB) was conducted to identify factors associated with the flock-level occurrence of scrapie. This survey was undertaken to update an earlier postal survey in 1998, and was the first occasion in which a large-scale postal survey had been repeated. RESULTS: The results of the 2002 survey indicated that scrapie was more likely to occur in certain geographic regions; in purebred compared to commercial flocks; in larger flocks; in flocks which lambed in group pens compared to those which lambed in individual pens; in flocks which always lambed in the same location compared to those which did not; and in farms which kept certain breeds of sheep. In addition to these factors, the likelihood of the disease occurring in homebred animals was higher in flocks which bred a greater proportion of replacement animals or which bought-in lambs. Finally, within-flock transmission following exposure was more likely to occur in hill flocks compared to other farm types; in flocks which bred a greater proportion of replacement animals; and in farms which kept a certain crossbreed of ewe. CONCLUSION: The risk factors identified from the 1998 and 2002 anonymous postal surveys in Great Britain were similar. However, differences between the surveys were identified in the influence of region and of purchasing behaviour on the risk of scrapie. These differences are most likely a consequence of changes in farmer awareness and the impact of the 2001 foot-and-mouth disease epidemic, respectively.
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McIntyre et al. (2006) conducted a cross-sectional in Scrapie (n=2,511). Flock-level risk factors (e.g., geographic region, flock size, lambing practices) vs. Reference farm characteristics was evaluated on Occurrence of scrapie in a flock (never versus ever). Flock-level risk factors for scrapie included specific geographic regions, purebred flock type, larger flock size at high stocking density, and specific lambing and purchasing practices.