THE letter from Blowey and others (VR, February 21, 2015, vol 176, p 208) was an observational study based on their own records of a standardised test. The limitations of the analysis were acknowledged from the outset by the authors, ‘This was a simple practice survey . . .’. However, they took pains to eliminate variables such as a change in operator due to a farm moving practices. They worked on the hypothesis that badger culling would lead to an increase in the prevalence of TB within the cull areas. The results were clear; there was no increase in the number of cattle reactors. This analysis has been backed up by the simple observation of the practice staff who have sent fewer reactor tags. The report therefore presents an immediate observation as well as a retrospective analysis.
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