TB in Cattle and Badgers

Debate between James Gray and Ruth George

Wednesday 23rd October 2019 Westminster Hall

[James Gray (North Wiltshire) (Con)]

I congratulate the hon. Lady on making a well-balanced and sensible speech, taking neither one side nor the other. I very much endorse her on mental health. This problem particularly affects places such as North Wiltshire, where 200 farms have been entirely closed down—many on several occasions—and entire herds slaughtered. The psychological effect on a farmer seeing his or her herd entirely slaughtered two or three times is horrendous.

[Ruth George]

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was replaced by six-monthly testing and the higher use of interferon gamma testing where TB-free status had been withdrawn.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.

We come to the role that badgers play in the increase in bovine TB in Derbyshire. The APHA study states that, based on probability, 77% of infections come from badgers. However, only one case in 148 was confirmed to be definitely due to badgers. Alternative academic analysis suggests that between 75% and 94% of infections are caught from other cattle, not from badgers. It can appear as though badgers are being scapegoated while the evidence for residual infection within herds is being discounted.

Badgers are present throughout Derbyshire and on most farms. I pay tribute to farmers, who have been most helpful in the badger vaccination programme. However, testing last year of badgers killed on roads across Derbyshire by Professor Malcolm Bennett of the University of Nottingham found that only four out of 104 were infected with bovine TB—just 4%. It therefore seems surprising that they are deemed to account for 77% of cattle infections. Considering that the higher number and greater accuracy of tests has driven the increase in cases, it is surprising that only 5% of cases of bovine TB are deemed to be due to residual infection in a herd, especially when in 40% of all cases there had been a history of infection in the herd in the last three years.

[James Gray]

Will the hon. Lady give way?

[Ruth George]

I will have to make some progress, as there are several more speakers to come in. I am sure the hon. Gentleman will have a chance to make his point later.

It is acknowledged that the pattern of livestock markets facilitates the flow of cattle in Derbyshire from the high-risk area to the edge area and that the major risk to other edge areas adjacent to Derbyshire—Cheshire, Nottinghamshire and Leicester—is mostly via cattle movements. When we say we must look at all the reasons why cattle are contracting bovine tuberculosis, we must look at cattle movement and infection in a herd.

The size of the herd was also a major factor. Herds of under 50, which account for about half of all cattle herds in Derbyshire, had only a 3% risk of contracting bovine tuberculosis. That rose to 27% in herds of 200 to 350, and to 38% in the largest herds of 500-plus. It seems very odd that badgers would discriminate between small herds of cattle and large herds.