The survey was carried out in the RBCT counties of Cornwall, Devon, Gloucestershire, Herefordshire, and Worcestershire.
BBC: NEWS | UK | England | Devon | One in seven badgers has TB signs
This was done by comparing data with findings from the Randomised Badger Culling Trial (RBCT).
Ongoing research around the RBCT culling sites also shows that while the benefits of culling within the trial zone persist for some time, the spike in infections around the edges - the perturbation effect - tends to dissipate over time.
BBC: Badgers back in the firing line
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