Absolutely. Any of us who has had a pet put down knows how painful that can be, so a farmer having to put down a whole herd that they have built up does not bear thinking about. Bovine TB does not just have an emotional cost; it is also one of the greatest animal health threats to the UK. It costs the public more than £100 million a year in compensation, and it costs the farming industry about £50 million a year.
In Derbyshire, we are on the edge of bovine TB. Last year, 1,230 cattle were slaughtered in the county, compared with just 672 the previous year. The annual incidence rate in herds increased from 7.7% to 8.4%, mainly, I would argue, because in January 2018 the high-risk area of Derbyshire was reclassified as an edge area. The increase in cases was driven solely by the reclassified area, as the area that remained classified as edge area was reduced. In the new edge area, on the edge of the outbreaks, annual surveillance testing was replaced by six-monthly testing and the higher use of interferon gamma testing where TB-free status had been withdrawn. That replaced the skin tests, which we know are only 50% or 60% accurate, meaning that under those annual tests many more cattle go by undetected with TB. In 2018 in Derbyshire, 45% of infected cattle were identified by gamma reactor testing, compared with just 7% in 2017.
The Animal and Plant Health Agency report on TB in Derbyshire states that the interferon gamma test has a higher sensitivity than the skin test, so it discloses more infected cattle, often at an earlier stage, or those that may have been missed by the skin tests. In 2018, 2,400 tests were done, compared with 1,800 in 2017. This also applies to other areas, as gamma testing was introduced for edge areas from 1 April 2017. The number of new herd incidents fell slightly, from 4,700 in 2010 to 4,400 last year. More cattle are therefore being slaughtered but from a lower number of herds, with the average per herd increasing from 10 to 12. It is interesting that bovine tuberculosis has spread from areas with higher herd numbers to areas such as Derbyshire, where herd numbers have traditionally been much lower.