These were: i the time to detection of an increasing trend in prevalence ii) the number of infected animals (and sheep holdings for scrapie) in the standing population at the time of detection iii) the number of infected animals presented at slaughter during the period from the start of the increasing trend to detection.
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Evidence for more cost-effective surveillance options for bovine spongiform encephalopathy (BSE) and scrapie in Great Britain.
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