Spatial distribution of the active surveillance of sheep scrapie in Great Britain: an exploratory analysis |
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| Authors: | Colin PD Birch Ambrose C Chikukwa Kieran Hyder Victor J Del Rio Vilas |
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| Affiliation: | (1) Veterinary Laboratories Agency – Weybridge, New Haw, Addlestone, Surrey, KT15 3NB, UK;(2) Department for Environment, Food and Rural Affairs (Defra), Nobel House, 17 Smith Square, London, SW1P 3JR, UK |
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| Abstract: | Background This paper explores the spatial distribution of sampling within the active surveillance of sheep scrapie in Great Britain. We investigated the geographic distribution of the birth holdings of sheep sampled for scrapie during 2002 – 2005, including samples taken in abattoir surveys (c. 83,100) and from sheep that died in the field ("fallen stock", c. 14,600). We mapped the birth holdings by county and calculated the sampling rate, defined as the proportion of the holdings in each county sampled by the surveys. The Moran index was used to estimate the global spatial autocorrelation across Great Britain. The contributions of each county to the global Moran index were analysed by a local indicator of spatial autocorrelation (LISA). |
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