Is APHA’s approach to bTB control negligent?

The annual bovine TB epidemiology reports (1) for England and Wales, both compiled at APHA Weybridge, have historically had authors in common. More recently however, the reports no longer publish the identity of the authors. Why might this be? What we see now is a definite disparity in approach, presentation and implication.

The emphasis on wildlife and Risk Pathways Analysis (RPA) in the England reports is noticeable, compared to the Welsh versions (Table 1) which barely mention them. So whilst bTB is clearly the same disease in both countries, the attribution to wildlife, cattle movements and residual infection differs very markedly as you cross Offa’s Dyke.

*Wales not yet reported

Table 1. Mentions of the risk pathways approach and badgers and wildlife as a source of  bovine TB infection in APHA reports for Wales and England 2016-2021. Note near absence of mention for Wales, while England has a growing obsession over wildlife involvement.  Will attempts be made to force Wales to follow England’s scientifically unreferenced pathway?

These differences have occurred due to the use in England of un-evidenced data to support a policy that culls badgers in England, whereas in Wales no such policy exists (2).  RPA was introduced in 2015 by APHA on a trial basis by vets using the newly updated Disease Report Form (DRF), and with the stated aim of identifying the source of bTB breakdowns, defined as ‘hazards’. In this trial, the pathway by which disease entered the bTB infected herd was to be decided by the investigating vet. The DRF provided a list of epidemiological hazard options to select; the option of attributing disease to wildlife was the default where attribution to a cattle source was not immediately obvious. The trial was quickly hailed as a success and expanded in 2016 with a few changes. In 2017 it was adopted by APHA as a standard recognised procedure for identifying the source of an infection, training vets to routinely misdiagnose.  

Risk Pathways; a process hijacked by pro-badger cull advocates

APHA have not been able to provide scientific citation to validate the use of RPA protocol. Despite claiming since 2019 that they have a supporting paper in preparation for peer review and publication in a scientific journal, over three years later this has not appeared. It could perhaps be argued that RPA has all the hallmarks of being constructed by APHA to facilitate and support widespread badger culling, because that in effect is what it has done.

Since 2017 RPA has become the primary tool to implicate badgers as the source of the majority of incidents in England (2,3). Wales, in contrast, cites cattle movements, residual cattle herd infection and poor cattle purchasing decisions as the primary sources of bTB herd infection.

A trawl through recent APHA English County bTB reports reveals a plethora of statements about badgers which are not supported by qualifying scientific evidence. Many of these are stated as if they are settled science (they are not), or with descriminatory language. Below are a few examples from the Executive Summary of the APHA England 2021 epidemiological report (4) :-

“Eradication of bovine TB requires control of infection in both cattle and the main wildlife reservoir (badgers).”

“In 2021, as in previous years, herds located in the HRA (where there is high infection pressure from cattle and badgers),…….”

“For England, the source of infection with the highest weighted contribution was badgers (49%), followed by ‘Other or Unknown’ sources (17%). The most frequently considered sources of infection in the HRA were badgers (52%) and ‘Other or Unknown’ sources (16%). In the Edge Area, badgers constituted 52% of the considered source, followed by cattle movements (17%).

The existence of local reservoirs of M. bovis shared by cattle, badgers and other species; wildlife reservoirs of M. bovis are more common in the HRA and the western and northern parts of the Edge Area.

Compare this with the extracts from the Executive Summary Wales Bovine Tuberculosis Surveillance Report 2020 (5), where there is not a single ‘wildlife’ reference.

The risk of a herd becoming infected with TB is associated with factors such as herd density, herd size, production type, TB history and location. These factors contribute to the spatial pattern of TB in cattle herds across Wales. Dairy herds had a significantly higher TB incidence rate compared to beef herds, with this effect remaining after adjusting for herd size and location. Similarly, herds with more than 300 animals have the highest incidence rates, with this effect remaining after adjusting for herd type and TB Area.”

“The increase in recurrent infection (a TB incident occurring within the last two years) in cattle suggests this remains an important driver of infection in Wales.

Use of antibody blood tests increased by 85% in 2020 compared to 2019, with 11-13% of tests disclosing reactors in the high TB areas, west and east, intermediate TB area mid Wales.”

From 2017 onwards, the England epidemiological report has a map illustrating the areas of England where badgers are considered by (what is described as) “informed veterinary opinion” to be the source of bTB infection. This is veterinary opinion that has been informed by APHA’s flawed briefing of vets.The map suggests that badger contribution far outweighs that of cattle. Combined with DRFs, from which the map data is derived, it offers no evidence to support this veterinary judgement. There is a clear bias towards blaming badgers. It even references “infected badgers” within the text, with an admission from APHA that no badgers have been clinically tested.

There have already been 10 years of intensive badger culling in England, and there appears to be some intention to continue with so-called ‘epidemiological culling’ into the future, despite a lack of evidence as to efficacy (6). APHA’s epidemiological assessments try to justify this new style epidemiological culling, by ‘finger pointing’  badgers as the source of breakdowns.

Unscientific perpetuation of wildlife involvement persists

The unscientific claims of wildlife involvement in bTB persist. They are being pedalled via epidemiology reports that lack scientific evidence and backed by vested industry and veterinary interests. The speculative blaming of badgers as a source of bTB infection in cattle, without scientific evidence or justification, seriously undermines the whole bovine TB eradication policy.

APHA pride themselves on being a world class science establishment, supported by such statements as :

Science continues to be fundamental to everything APHA does and we are committed to high quality science-based evidence for decision making and policy development. We will deliver this strategy over the next five years.

The new model for epi-culling is not quite the model of scientific rigour APHA aspire to. Is it more a clear case of confirmation bias, remoulding and manipulating information to support a government policy that has tried to normalise removing large numbers of healthy badgers from the English landscape, contrary to high quality science based evidence and to correct handling of uncertainty and precautionary principles.

It has to be asked, has this manipulation been intentional? Is incompetence or even negligence the right perspective? Will public opinion continue to be ignored? Who exactly is pushing biased procedures? What level of pressure is being exerted from vested interests, and who is routinely interfering with government science?

References:

1. APHA 2022 Bovine Tuberculosis in England in 2021 Epidemiological analysis of the 2021 data and historical trends November 2022.

2. Griffiths, L.M., Griffiths, M.J., Jones, B.M., Jones, M.W., Langton, T. E. S., Rendle, R.M., & P.R. Torgerson. 2023. A bovine tuberculosis policy conundrum in 2023. On the scientific evidence relating to the Animal and Plant Health Agency/DEFRA policy concept for ‘Epidemiological’ badger culling. An independent report by researchers and      veterinarians to Defra and the UK Parliament.

3. Critical evaluation of the Animal and Plant Health Agency report: ‘Year End Descriptive Epidemiology Report: Bovine TB Epidemic in the England Edge Area – Derbyshire 2018, E. Wright BVSc Cert VA Dip (AS) CABC MRCVS & S. Mayer BSc BVSc PhD MRCVS.

4. APHA 2021. Science Strategy 2021-26.  Expertise with Impact. Online strategy.

5. APHA 2020. Epidemiology of bovine tuberculosis in Wales. Annual surveillance report
For the period: January to December 2020.

6. Langton TES, Jones MW, McGill I. Analysis of the impact of badger culling on bovine tuberculosis in cattle in the high-risk area of England, 2009–2020. Vet Rec 2022; doi:10.1002/vetr.1384

Long-term protection for badgers in Bas-Rhin, France

Monday, May 15 was World Badger Day, but in France protection depends on which side of a boundary the badgers are.

Photo L’Alsace /Marc WILB

Badgers are not all in the same boat in the Alsace region of France. There are the lucky ones, in the department of Bas-Rhin, where hunting is not allowed. Sadly, their neighbours, in the Haut-Rhin, can be hunted legally as in the rest of France.

The Bas-Rhin is therefore a national exception to the rule, the only department where it has neither the status of pest nor of  a huntable animal. “In fact, it is classified without legal status. This means that there is no authorization to hunt it and therefore that it cannot be hunted”, says Lætitia Duhil, badger referent at the League for the Protection of Birds.

The status of ‘pest’, hunted or not, is defined in each department by commissions bringing together hunters, farmers, foresters, environmental associations, and representatives of the State. In the Bas-Rhin, the associations advised at the end of 2004, a cessation of badger hunting.

Since then, it has not been deemed necessary to return to hunting, on the findings that a natural balance in their numbers now prevails and there is simply no need. In the Haut-Rhin, however, the wildlife commission has not yet invalidated badger hunting. Last year, only a hundred badgers were killed, an insignificant number compared with an estimated population of 10,000 – 15,000 badgers across Alsace. Leaving badgers alone seems to simply be the best way to manage them. This philosophy will hopefully now spread across France and elsewhere in Europe.

Translated from & with thanks to:
https://www.lalsace.fr/environnement/2023/05/12/le-bas-rhin-paradis-des-blaireaux

Bovine TB and Badgers: a weakened link

A new article in the May issue of British Wildlife magazine provides an overview of the current state of affairs with badger culling in England, and a welcome update on the science surrounding the issue.

It looks at new work that questions the role that badgers play in bovine TB in cattle, and what the most likely reasons behind the perpetuation of the disease are.

It also looks at the problems that badger culling is likely to be causing to the ecosystem in general, and whether or not this is being adequately monitored or mitigated.

There is a potted history of legal challenges to the badger cull, and a view on the insight and benefits that this difficult work has provided.

It looks at where the current government intends to take the badger culling policy next, and what ‘epidemiological culling’ could mean for our badgers in the future.

You can access a copy of the article here, for a charge of 99p.

Where are they killing badgers?

Below is a summary table of the number of badger cull zones in each county of England since 2013 and those predicted according to government indications until 2025 (end of January 2026).  A measure of culling intensity is the number of cull areas, although some counties such as Somerset are far larger than others. It’s a sickening reminder of how extensive the culls have been, with already over 210,00 mostly healthy badgers reported shot, and many thousands of adults and cubs injured by the cruel methods used. 

The ‘zones’ are the HRA (High Risk Area) the Edge (Edge Area) and the LRA (Low RIsk Area). Cumbria* and Lincolnshire* have been subject to localised culling of 100% of badgers. Some of the cull areas overlap with other cull areas, so this is a generalised picture.

Last night in the House of Lords

Last night (15th May) in the House of Lords, Amendment 47 of the Retained EU Law (Revocation and Reform) Bill was discussed. There were a couple of points raised which will be of interest to those following the science of badger culling.

The amendment, moved by The Earl of Caithness, was described thus:

47: Clause 17, page 20, line 34, at end insert—“(3) In subsection (1)(b), developments in scientific understanding must be identified based upon regular reviews of the scientific evidence.(4) When undertaking a review of scientific evidence referred to in subsection (3), the relevant national authority must consider the methodological quality of the evidence, in terms of the extent to which all aspects of a study’s design, data collection protocols and statistical analysis can be shown to protect against systematic bias, non-systematic bias, and inferential error.(5) Where regulations under subsection (1) constitute environmental law, the review of scientific evidence must also consider whether the evidence takes a sufficiently wide view of the ecological impacts.”Member’s explanatory statementThis amendment is to ensure that future regulations will be based on a proper assessment of the best science available.

Member’s explanatory statement:
This amendment is to ensure that future regulations will be based on a proper assessment of the best science available.

Lord Krebs was at last nights debate and said:

“I support in large part what he said about the importance of rigorous scientific evidence to underpin policy—he referred to the environment, but I would say more broadly. I will add a note of caution from my personal experience. As many noble Lords will know, I was responsible for instigating the randomised badger culling trials, the so-called “Krebs trials”, which were meant definitively to determine whether killing badgers was a good way of controlling bovine tuberculosis. The trial was probably the largest ecological experiment ever done in this country; it did produce results, but it did not settle the arguments or the policy. So science has an important role to play, and I support the noble Earl’s amendment, but we must recognise that political decisions come in as well.”

So Lord Krebs, who set up the Randomised Badger Culling Trials (RBCT), states that the results did not settle the argument as to whether killing badgers was a good way of controlling bTB in cattle.

Further, The Earl of Caithness, speaking in the same debate quoted Lord John Krebs from the recent debate on the Genetic Technology (Precision Breeding) Bill, where he said;

“scientists do not absolutely agree on everything”.

And;

“when there is a centre of gravity of opinion, there are always outliers. Sometimes those outliers turn out to be right and there are transformations”.—[Official Report, 25/1/23; cols. 221-23.]

So in summary: the RBCT did not settle the arguments on the efficacy of badger culling, and the outliers in scientific opinion sometimes turn out to be right and there are transformations.

Will this to be the case with badger cull science; the outliers will turn out to be right, and there will be transformations?

NEW REPORT: A Bovine Tuberculosis Policy Conundrum in 2023

Featured

A team of researchers and veterinarians have concluded an urgent need for rapid change to bTB policy for England, warning the present focus on badgers is undermining efforts to combat the disease.

You can read the report HERE:

The Independent story on the report “Government’s badger cull plan ‘deeply flawed’, damning report warns” is available here.

The Vet Times story on the new report, 11.05.2023: “New report blasts ‘weak science and huge supposition’ behind bTB policy” is available here.

Updated Vet Times story, 22.05.2023: “Immediate rethink sought as report condemns badger cull” is available here.

“A culture of flawed government veterinary beliefs”

Independent Report Exposes Unsafe Procedures in Bovine TB Control in English Cattle

 

A new report on the possible future use of so called ‘epidemiological badger culling’ is being released to MPs and Parliament on 11th May 2023. Compiled over the last year by a group of independent experts, it looks closely at one specific element of the government’s bovine TB control policy proposals for English cattle herds; that regarding the role of badgers in bTB disease hotspots as they develop.

The report can be accessed HERE.

Government Policy in 2020 had suggested a move away from intensive mass badger culling, that by 2022 killed over 210,000 mostly healthy badgers in England since 2013. This huge programme of wildlife intervention has produced no demonstrable benefit to disease control in cattle, with the government silent on results since 2017.

Authored by experienced and independent researchers, veterinarians, and epidemiologists, it addresses DEFRA’s handling of the disease crisis, and why the 2020 “Next Steps” policy is likely to fail because of incorrect decision making and exaggerated claims made on the back of equivocal research results.

The report claims that the Animal and Plant Health Agency (APHA) and DEFRA, are failing in their duty to provide proper scientific approaches to vital aspects of the heavily publicly funded, long running bovineTB control crisis in England.

Specifically, it exposes the poor rationale behind aspects of the proposal which aims to implement systematic localized elimination in an area of all (100%) of badgers, an approach termed by DEFRA as ‘epidemiological badger culling’. This back-door approach to systematic removal of badgers from farmland where cattle have bTB, is already being trialed in a small number of counties and appears to be planned in more. But it is founded on evidence and beliefs that are not fit for purpose.

The 55 page report with 2 page summary, provides a catalogue of evidence on issues that the authors say have been consistently misrepresented by APHA and the Chief Veterinary Officer. It calls for an immediate rethink, scientifically robust planning and an end to supporting an ill-conceived policy with uncertain science and procedures.

The report is prepared in advance of an anticipated government consultation over its future policy to phase out badger culling.

Report Citation: 
Griffiths, L., Griffiths, M., Jones, B., Jones, M., Langton, T.E.S., Rendle, M., Torgerson, P. 2023. A bovine tuberculosis policy conundrum in 2023. On the scientific evidence relating to the Animal and Plant Health Agency/DEFRA policy concept for ‘Epidemiological’ badger culling. An Independent report by researchers and veterinarians to DEFRA and the UK Parliament. APRIL 2023.

The Canary sings: government adds multiple extensions to existing badger cull areas

Last Friday, The Canary online  published a story about how large scale badger culling continues to be extended, despite government claims in 2020 that it is being phased out. 

It reports on Freedom Of Information disclosures that show  Natural England approved 10 cull extensions in 2022 in addition to declaring new areas. This amounted to badger killing on an additional 327km2 of land. In 2021, it greenlit eight extension areas totalling 342km2 in all. Natural England  effectively confirmed that extensions are again likely for 2023 by indicating that these are “in course of completion”. 

It’s a deeply disappointing story of more and more healthy animals being mass killed  by stealth, just in case they are involved in the cattle TB epidemic and despite latest published peer- reviewed science showing badger culling has no effect on herd breakdowns. You can read the full article here.

 

Badger cull science failure, denials and confusion

Since mid-March 2022, Defra has persisted with its claims regarding an independent scientific paper (1) that extensively analysed government data on herd bTB incidence and prevalence in the High Risk Area of England since 2010. The paper compares areas subject to badger culling with those that were not culled in each year of the controversial mass badger culls from 2013-2019.The paper concludes that badger culling has had no measurable benefit in bovine TB disease reduction, and Defra continue to claim that the paper is flawed.

Defra’s and Natural England’s position on this new analysis, including apparently that of the Defra chief scientist (CSA), Gideon Henderson and chief vet (CVO) Christine Middlemiss, seems to be based on their dislike of the statistical approach of the new paper, which differs from Defra’s traditional approach to badger cull evaluation.

Defra/APHA prefer to try to mimic the analytical methods of the Randomised Badger Culling Trial (RBCT). They take cull areas and compare them with different unculled areas, adjusting the data considerably to try to take account of the subtle or sometimes profound differences between compared areas. The new study took a different approach. This study looked at the same (or 97% of) herds over the years of study, so spatial differences were minimized. The analysis used data from herds when they were in unculled areas, and then again when they were in culled areas following their transition from one to the other. This simple approach, dictated by Defra secrecy over cull area locations, brings different strengths and requires less interference with the data. The approach enabled all the data available to be used, not just selected parts of it that might lead to skewed, inaccurate results and conclusions. Just look, for example, at the tangled caveats in the Downs paper from 2019 of just three culled areas and multiple unculled areas.

But Defra are very bold in their criticism : “the analysis was scientifically flawed. It manipulated data in a way that makes it impossible to see the actual effects of badger culling and therefore its conclusions are wrong.” Confident claims, but do they have merit?

Defra’s ‘inappropriate grouping’ claim

Defra’s main objection surrounds the issue of what they call ‘inappropriate grouping’ of data. This is the key point in the letter that they pressed the Veterinary Record journal to publish alongside the shortened printed version of the paper on 18th March. This was reported on in more detail here.

The problem in Defra’s claim  goes beyond the calculation mistakes in their 18 March Vet Record graph, that they subsequently (in May) apologised for, retracted & replaced with results more similar to those in the new paper. Defra’s presented data shows the herd bTB incidence reducing dramatically in the first and second years from cull commencement. This is the same data as used in the new paper, so this is no surprise. But the point is, Defra say that you cannot group data from years one and two of culling with that from the third and later years because the level of decline in years one and two are too small, and this will remove all signs of effect. However, the Defra graphs do not show that the level of decline in years one and two in cull areas is small, and this is the contradiction that they refuse to talk about.

Similarly, the analysis presented by APHA staffer Colin Birch at the IVSEE16 conference in Nova Scotia, Canada earlier this month, (2) Figure 1, does not show that the level of decline in years one and two is small either.  It showed sustained decline  over 4 years, with a similar level of decline each year right from the start. Yet it provided no comparison of data from the 25% of the HRA that remains unculled. To the audience’s complaint, here, he quite wrongly tried to attribute these declines to badger culling.

Figure 1. Marginal effects on confirmed bTB incidence rate associated with duration of badger control. Error bars indicate 95% confidence intervals. From Birch abstract ISVEE 2022

So where did the ‘inappropriate grouping’ comment come from? Well, it is likely that Defra have fallen back on RBCT advice and the 2006 and 2007 (3,4) papers that presented the findings of 10 treatment-control area comparisons of small cull areas. These papers showed large variation in the estimated levels of decline in bTB herd incidence in culling areas, so much so that the confidence intervals (CI) on the presented graph figure 2A (Figure 2.) passed through 0 in most years.

Figure 2. Fig 2 (A) from Donnelly et al. 2007

Estimated average declines were 3.5% in year 1 and 12.8 % in year 2, with 39% in year 3. So, you can see that by using the RBCT as a prior reference source (this the point of reference used in Defra/APHA documents), there could be an expectation that there isn’t much disease reduction in years 1 and 2.  However, while the drop may not  have been projected to show significance until year 3, the decline trend should be present and visible by the end of year 2.

So looking again at Figure 1 (Birch 2022 abstract), government is now turning this on its head and claiming, in contradiction, that bTB incidence among cattle herds reduced by around 15% per year in each of the first two years of badger culling.

Defra’s unsupported point was also made by Cambridge vet James Wood on Radio 4 Farming Today on 19th March 2022, but it simply doesn’t stack up. Even if there was just a modest (say 8% average) annual benefit in years 1 and 2, it would still have shown up in the new paper analysis in comparison with unculled areas when using such a huge amount of data, as is possible using the 2016 onwards rolled-out HRA badger culls.

Ridiculously, Defra have previously claimed substantial benefit in years 1 and 2 from the post-2013 cull data, and used this as a basis for claiming badger culling was working. They did this spectacularly in 2017 with the APHA Brunton et al. paper (5) that suggested benefit 32% in Somerset, and 58% benefit in Gloucestershire in the first two years, and again in 2019 with the notorious and heavily caveated Downs et al. paper using data to-2017 (6), that was undone by the 2018 results (7), also published in the veterinary literature, with slightly more claimed benefit (Table 1 below).

Pilot cull Area 2013-2017

Brunton et al. 2017

Downs et al. 2019

Percent est. in Yrs 1 and 2

Gloucestershire 1

58%

66%

88%

Somerset 1

32%

37%

86%

Table 1. Claimed benefit from badger culling in Brunton et al (5) and Downs et al (6).

The Defra Minister and MP’s were told that badger culling was working based on this claimed year 1 and 2 benefit. They told parliament and the public in no uncertain terms that badger culling was working, so they can’t really go back on it now without losing face. James Wood also told Countryfile views that he thought the data showed badger culling was working based on the first two-years of pilot data. So, who is talking in riddles now?

The problem that Defra have, and it is why they have clammed up to the scientists and media, is that if Defra/the CSA/CVO were to communicate beyond the bold claims made in March in Vet Record and on the Defra media blog, they would lose the argument. Defra have written to the first author saying they are not prepared to discuss the matter. Caught, it seems, between their scientific advisors’ comments, legal undertakings to monitor efficacy and policy-mania to keep on badger culling in the face of failure. Even Natural England have gone as far as saying that the situation is unclear “Because these different control measures are being implemented simultaneously, it is difficult to determine the relative contribution each of them is making to disease reduction.”

Insufficient data points?

One argument Government have used to dismiss the validity of the new paper is that it has insufficient data points. While the new study does has few data points, each data point summarises a huge amount of data representing hundreds or thousands of herds, helping to obviate the kind of problems caused by the smaller data sets of APHA studies. The approach is equally or more valid. It did, after all, pass rigorous peer-review (4 reviewers including at least two epidemiological statistical specialists) in a leading veterinary journal.

Basically, Defra lost both arguments, rebutting the paper in short measure, and it is astonishing that CSA Henderson CVO Middlemiss were given this position to hold, let alone to defend. No wonder Middlemiss got muddled on Farming Today over it on 25 May.  This problem is now many months old and Defra and Natural England have carried their unsubstantiated criticisms along to justify the licensing of further supplementary culling licences in May and  intensive culling licenses from August. This means the killing of tens of thousands more largely healthy badgers over the next four years to add to the roughly 200,000 that have been slaughtered to date. This flies in the face of peer-reviewed science, against which Defra have failed to produce anything credible or comprehensive that is peer-reviewed.

At the Birdfair State of the Earth panel debate on 15th July of this year, the retired badger cull architect Prof Ian Boyd: Chief Scientific Adviser at Defra (2012-2019) commented: “Well, if badger culling isn’t working it shouldn’t be done, that’s absolutely clear.  I think there is still an ‘if’ there, but I suspect that the evidence is suggesting it doesn’t work.”

And Prof David Macdonald at Oxford, who chaired the Natural England Scientific Advisory Committee for many years, and who called the Pilot culls an ‘epic fail’ has commented in Chapter 16 of his new Oxford University Press book ‘The Badgers of Wytham Woods’: “ it is hard to see how Middlemiss and Henderson land a knock-out punch on Langton et al’s analysis..”

There is nothing very dramatic or complicated here in Defra’s last stand. Defra has lost the scientific argument. They must surely now face abandoning the failed badger culling policy altogether. They really should talk openly about it.

References

1. Langton TES, Jones MW, McGill I. Analysis of the impact of badger culling on bovine tuberculosis in cattle in the high-risk area of England, 2009–2020. Vet Rec 2022; doi:10.1002/vetr.1384.

2. Birch, C. Prosser, A. and Downs S.  An analysis of the impact of badger control on bovine tuberculosis in England. Abstract oral presentation to ISVEE16, Halifax, Nova Scotia, Canada. 2022.

3. Donnelly, C. A. et al. Positive and negative effects of widespread badger culling on tuberculosis in cattle. Nature 439, 843–846 (2006).

4. Donnelly CA, Wei G, Johnston WT, Cox DR, Woodroffe R, Bourne FJ, Cheeseman CL, Clifton-Hadley RS, Gettinby G, Gilks P, Jenkins HE, Le Fevre AM, McInerney JP, Morrison WI. Impacts of widespread badger culling on cattle tuberculosis: concluding analyses from a large-scale field trial. Int J Infect Dis. 2007 Jul;11(4):300-8. doi: 10.1016/j.ijid.2007.04.001. Epub 2007 Jun 12. PMID: 17566777.

5. Brunton LA, et al. Assessing the effects of the first 2 years of industry-led badger culling in England on the incidence of bovine tuberculosis in cattle in 2013–2015. Ecol Evol. 2017;7:7213–7230. doi: 10.1002/ece3.3254. – DOI – PMC – PubMed.

6. Downs S H, Prosser A, Ashton A, Ashfield S, Brunton L A, Brouwer A, et al. Assessing effects from four years of industry-led badger culling in England on the incidence of bovine tuberculosis in cattle, 2013–2017. 2019. Sci Rep. 2019; 9:14666. 
https://doi.org/10.1038/s41598-019-49957-6. Accessed 16 June 2021

7. Mcgill I, Jones M. Cattle infectivity is driving the bTB epidemic. Vet Record. 2019; 185(22), 699 – 700. 
https://pubmed.ncbi.nlm.nih.gov/31806839/.

Will Government Secrecy on Key Bovine TB and Badger Cull Data Prevail?

Tribunal sits to reconsider Information Commissioner’s decision.
Badger Cull Data Tribunal Hearing on 01 November 2022. EA/2022/0007

This week, Dr Brian Jones appealed to the first-tier tribunal of the General Regulatory Chamber (Information Rights) in an online hearing coordinated by the GRC Team in Leicester. It concerned a ruling by the Information Commissioner upholding the decision by the Animal Plant and Health Authority (APHA), not to supply the data to him on herd breakdown figures for culled and unculled areas in the High Risk Area. It had been decided that to supply the information would have been an unreasonable burden and contrary to the public interest.

Presiding over the tribunal was Judge Hazel Oliver with Messrs Taylor and Sivers making up the panel. Charles Streeten represented APHA with Dr Jessica Parry attending for APHA while Dr Jones represented himself with nature conservation consultant Tom Langton as expert witness.

Dr Jones was Senior Hospital Immunologist and Head of the Clinical Immunology Unit at Queen Mary Hospital, Hong Kong and Honorary Associate Professor of Immunology in the Medical Faculty at Hong Kong University, until his retirement in 2007. He has published over 100 peer-reviewed papers on human immunology in health and disease. He has taken a keen interest in the immunology of bovine TB, not least in the immune based and failing tuberculin skin (SICCT) test, that releases 15% of infected herds each year to go on to infect stock around the country, because it averages around 50% test sensitivity on individual cows; perpetuating the epidemic at massive public cost.

Dr Jones opening remarks stated that 23 months ago he had submitted his request  for data “APHA should have at their fingertips” and which could have enlightened the contentious issue of badger cull efficacy. He said that APHA would probably argue that this is not the point of issue for this tribunal, only that his request should be lawfully dismissed under the Environmental Information Regulations. 

Dr Jones said that the documents that have been submitted by him essentially argue that culling badgers is not a justifiable component of bovine tuberculosis control and that the evidence was obtained through peer reviewed statistical analysis of DEFRA’s own data. APHA have not succeeded in disproving that evidence, despite all efforts to influence publication of the Langton et al. paper (here) 2022 in Veterinary Record.  Dr Jones said that throughout his career in clinical laboratory immunology he had practiced scientific rigour, impartiality, transparency, and integrity. He would expect these qualities to be universal for all who practice science. He believed this tribunal should take these issues into consideration in interpreting the Environmental Information Regulation 12(4)(b) concerning unreasonable requests and the public interest as it applies to this case.

Charles Streeten of Francis Taylor Building argued that the request was not really an Environmental Information Regulations (EIR) matter (where there is a public interest test and presumption in favour of disclosure) but that it was more of a Freedom of Information Act matter, as he argued the data related only to one species, cattle, and not to biodiversity of human health. Under cross-examination, Dr Jones did not agree with him. He argued that the data, with other data, combined to be of importance to many other species affected due to loss of badgers – an apex predator, including humans, because the healthy natural world is so essential for human wellbeing.

It was clear to the tribunal that APHA had not provided answers to at least some of Dr Jones’s questions, which could have been answered within the defined limit of reasonable time (24 hours) or given options for what could be supplied within that time. Dr Parry for APHA said they had around 5 people who worked on the issue and other specialists were also available for input and to answer public requests, but it was not her who made the decisions on FOI workload. To supply the data in question for Dr Jones APHA would need to create a computer ‘code’ in order to place the electronic data into a file to send to Dr Jones.

Mr Langton indicated that to extract, for example, Defra’s ‘never culled’ data from ‘all unculled data’ used by Defra in rebuttal of his paper, it might have required an additional simple communication between Dr Jones and Defra to identify that data for analysis in a short and straightforward iterative process. APHA had considerable resources for what was one of the great livestock disease issues of our time. This was the data the Defra still refused to provide today. This witholding of data was suspicious becasue APHA had not produced any analysis of badger culling beyond the 2017 data . Despite the apology to him from the CSA and CVO that the figures in their rebuttal to the 18th March paper in Vet Record were wrong, Defra were still refusing to hold a meeting to discuss the science, (here). Mr Langton’s witness statement contained a copy of an email (from APHA’s Eleanor Brown to the Veterinary Record’s editor) from March 2022, showing an attempt to block publication of his March 2022 paper.

In his closing statement Dr Jones said that he only wanted to make a very simple point, and that is that the best science and the firmest conclusions are always arrived at through sharing of unbiased data, collected through transparent processes.  He said:

“The expertise of independent scientists like Mr Langton and his colleagues should be utilised in collegiality with APHA to arrive at consensus approaches to controlling bTB. He was particularly concerned that the opportunity for accurately determining the part played by badger culling in controlling bovine tuberculosis will be lost once the unculled parts of the HRA become vanishingly small. They haven’t yet, but Dr Birch’s abstract presented at ISVEE (here) is saying that they have. This denies the possibility that the incidence and prevalence of bTB in unculled areas is actually falling at the same rate as in culled areas.“

Dr Jones maintained that provision of the data he had requested would have allowed the conclusions in Langton et al. to have been reached at least a year earlier and would have saved the public purse several million pounds. It would have allowed APHA to concentrate on their other important projects;

“Farmers, vets and scientists could have been concentrating on the effective measures that will eventually wipe out this dreadful disease: better diagnostic screening, prevention of fraudulent cattle trading and movement, training farmers in biosecurity, enhancement of slurry management regulations, vaccination of cattle with improved BCG.” he added.

Judge Oliver indicated that there was some potential for the outcome to be decided within three weeks; in November 2022.

Reference

Langton, TES, Jones, MW, McGill, I. Analysis of the impact of badger culling on bovine tuberculosis in cattle in the high-risk area of England, 2009–2020. Vet Rec. 2022;e1384. https://doi.org/10.1002/vetr.1384

Natural England and the 2022 cull licences

Over the last three years, the science base for badger culling has shrivelled away from ‘not very much’, to nothing. It has regressed from speculation that it might enable a modest annual reduction of bTB in cattle, to the reality that after 7 years of study, there is no measurable benefit when comparing herd breakdown rates in culled and unculled parts of the High Risk Area. It doesn’t work. This is one reason the government refuses to talk about it. Not only did the 2018 spike in bTB breakdowns in Gloucestershire show how unlikely it is that the killing of badgers is linked to the epidemiology of cattle breakdowns. It showed how cautiously the model-based claims of the Animal Plant and Health Agency (APHA) after 2 and then 4 years of culling should be considered. Subsequent detailed examination of all the government data this year in a peer reviewed paper (Langton et al) showed the badger culls to have failed.

Following a ridiculous three months of trying and failing to block and then rubbish the new scientific paper, Defra stopped communicating with the authors and enquiring journalists, leaving Natural England (NE) with the difficult decision of whether to continue issuing licences. The government response was to re-deploy Andrew Robertson from the government’s TB HUB information service in Exeter to Natural England in May of this year “because of a lack of expertise” inside the NE organisation. The outcome was that Natural England supported Defra’s position and issued yet more badger culling licences. Initially more Supplementary culling licences were approved by NE in May, this despite the fact that there was no benefit after 4 years to maintain for a further 5 years. Then in August, NE were somehow prepared to extend their belief in the killing of badgers and to continue culling badgers based on their own unpublished ‘secret’ science.

Instead of stopping culling as they should have done, NE have taken a nebulous stance on the science. It has refused to provide any written justification for its position, perpetuating its belief in the use of secrecy to prevent public scrutiny of their competence and decision making. The public have a right to see the rationale for their decisions, but this has been withheld. It is clear that NE have worked very very hard this year to facilitate continued issue of licences. They do this for a combination of reasons. They are likely fearful of contradicting Defra and APHA. Perhaps it would be too difficult to admit to failure on such a sensitive area.

Over the summer, NE Chairman Tony Juniper chose not to reply to communications, preferring to talk vaguely on public panels about NE not wanting culling and preferring vaccination. This summer he had a big chance to stop badger culling. He didn’t. He has now been in charge during the culling of most of the approximately 200,000 badgers. He and George Eustice have carried out what some call the near eradication of badgers over large parts of England.

NE eventually responded this week following a legal pre-action letter, sent in early October. They claimed that the death of the Queen and changes in government had prevented the licensing paperwork from being shared with those asking for it. These are embarrassing excuses for the lack of provision of legally required documents, on such a controversial subject of high public interest, and they reflect poorly on those responsible.

Information released late on Friday 28th October, showed 11 new cull areas, and the potential for tens of thousands more badgers to be killed. Over 30,000 or so could have already been shot over the last 8 weeks in a further sickening Natural England licenced ‘bloodfest’ of largely healthy badgers. One thing is certain, this is Natural England’s work. Natural England carry the torch for badger culling even if they say they are only following orders. As they have since 2012, when someone thought it would be a good idea for NE to carry it out and control it. They certainly have. It is the legacy of those involved with NE past and present, as much as anyone.

Did BTO help Natural England breach its High Court promises to monitor the ecological impacts of mass badger removal?

Another chance to read an important guest article entiled; ‘Breeding Bird Survey (BBS) data, badger culls, Natural England and the British Trust for Ornithology: New paper, same old.’ by Dominic Woodfield that first appeared on Mark Avery’s blog on 23rd September 

Dominic Woodfield is  a highly experienced practitioner in Environmental Impact Assessment and Habitats Regulations Assessment. Most of his work is for the development sector, but he has also undertaken commissions for Natural England, the RSPB, Wildlife Trusts and campaign groups. He once mounted a succesful independent legal challenge in defence of an important site for butterflies in Bicester, Oxfordshire.

Most readers would, I imagine, concur that an increase in fox populations in places where there are vulnerable ground nesting waders and waterfowl might be a matter worthy of conservation concern and attention. Especially where such increases are substantial (as much as a doubling of numbers), and arise as a consequence of a specific controllable human intervention, such as culling up to 95% of badgers across large swathes of English countryside.

Natural England (NE), which issues the licences to cull badgers, is obliged by statute to assess the potential side effects of badger culling on other species. When it comes to designated sites – SACs, SPAs, Ramsar Sites and SSSIs – NE do (now) acknowledge that a ‘predator release’ effect (where foxes and other mammalian predators increase in number via backfilling the ecological niche vacated by culled badgers) is an impact risk. Under pressure from legal challenges since 2017, NE has developed detailed guidelines for such assessments, amended their assessment procedures and added restrictions onto licences to better take this risk into account and/or mitigate potential effects on such sites. But outside these sites and across the larger part of the countryside in cull zones, the same birds, as far as NE are concerned, are on their own. There are no procedures for assessment or protection.

The small group within NE that processes and issues cull licences describes the ecological risks associated with ‘predator release effect’ as a consequence of badger culling as “theoretical”. This is despite their being flagged as a risk worthy of further investigation in the wake of the Randomised Badger Culling Trial (RBCT) in 2007 (Defra 2007) and again in 2011 (Fera 2011). This loose end did not trouble the masterminds behind the current badger cull, which commenced in 2013, nor those responsible for cull licensing within NE. At least it didn’t until relatively recently. Ultimately, it took the pressure of tribunals and legal challenge and the scrutiny of the courts in 2018, five years after the cull had started and with tens of thousands of badgers already removed, to force the agency charged with protecting our wildlife to finally promise a High Court judge they’d look more closely at this issue.

It’s conceivable that NE then asked the Government, through Defra, to fund a proper study and the Government refused. We don’t know. But in any event the outcome was that instead of a properly designed and controlled investigation, NE elected to go ‘cheap and cheerful’. Behind a wall of secrecy, they commissioned the British Trust for Ornithology (BTO) to conduct a simple desk study, extracting subsets of volunteer data from the Breeding Birds Survey (BBS) for cull and non-cull areas, and comparing them to see if there were any patterns to be found that might be attributable to badger removal. When, in 2018, the BTO unsurprisingly reported to NE that nothing conclusive could be gotten from such a coarse approach (Kettel and Siriwardena 2018), NE chose to interpret that as indicative that there was no issue to be concerned about, and advised Ministers and the Courts the same.

This is all old news of course, especially for readers of my previous guest blog, kindly published by Mark on 18th June (see here). In it I criticised the methodology and utility of these desk-top analyses of BBS data, the secrecy around them, and how NE’s chosen ‘absence of evidence is evidence of absence’ interpretation was used to inform badger culling policy decisions at Government level, without the benefit of such ‘science’ being through independent peer review or subject to any public scrutiny.

One of the BTO scientists involved was piqued into responding (his remarks can be found in the comments section under the blog, again (here). Amongst a somewhat prickly defence of the study’s approach and methodology, he conceded two of the central premises underpinning mine and others’ concerns. One: that the study did little to answer questions about the wider ecological side effects of removing as much as 95% of the population of an apex predator across large areas of English countryside. And two:  that ecological side-effects from removing badgers from the ecosystem were, to use his word, “certain”. Notwithstanding what those two concessions, when read together, say about the worth of this form of study, he said that he stood by it and furthermore that the BTO had been commissioned to repeat it in 2022.

The results of this repeat exercise have just been published in the Journal of Zoology. The paper is titled Ward et al. 2022 “Breeding bird population trends during 2013-2019 inside and outside of European badger control areas in England”. The abstract can be accessed here (but the full paper is behind a paywall). I encourage interested minds to read the full thing. Does it represent a robust way of finding out whether localised predator increases as a consequence of removal of badgers are having any impact on local populations of sensitive ground nesting species, such as lapwing, redshank, snipe or curlew?

My own thoughts on this question are below. Ward et al. 2022 essentially repeats the exercise carried out in 2018 and modified in Kettel et al. 2021, albeit with a slightly bigger data input. For me, the biggest difference is a much-improved discussion. Indeed, anyone who read my previous blog will observe that despite neither myself or any of the other more vocal critics of the 2021 paper (and its suppressed 2018 predecessor) being part of the peer review process, the discussion within the new paper rather reads as if we were! It attempts, at least, to respond directly to some of the criticisms of the methodology of analysis, the utility of the results and the inherent problems of bias, that were levelled at both Kettel et al. 2021 and Kettel and Siriwardena 2018.

In consequence, the authors are now more openly cognisant of the fact that studies this coarse-grained, data-limited and with such little statistical power, are never likely to detect impacts anything short of catastrophic for any individual bird species. It now also appears to be recognised by the authors that this sort of high-level approach inherently militates against the prospect of arriving at any conclusive answers to the fundamental question – is badger culling having a collateral ecological effect of relevance in conservation terms on any individual bird species?

All of which means NE have frittered away a further four years and paid the BTO an unknown quantity of public money to conclude, as Ward et al. 2022 does, that it’s not clear whether there is an effect or not and that answering the question would need better, more targeted investigation. The same conclusion reached fifteen years ago following the RBCT, again by Fera in 2011 and further reiterated by the Godfray Review of 2018 (Godfray et al. 2018). That a proper study is necessary and important. Not exactly revelatory – indeed it is no more than critics of NE’s lackadaisical approach to assessing the collateral ecological impacts from badger culling have been urging for years.

Although the authors’ discussion of the results in Ward et al. 2022 is an improvement on previous iterations, the continued application of a flawed methodological approach renders the study only marginally less worthless than its predecessors. The 2022 version remains, in particular, compromised by the decision to lump species at high risk of predation effects together with those at inherently lower risk, and by the inescapable fact that the BBS dataset is too coarse grained to provide a sufficient platform for sensible analysis for precisely the scarcer species – such as ground nesting waders – that should be a focus of concern. Instead, and in common with its 2018 and 2021 predecessors, the study contrives an ecologically nonsensical guild of “ground nesting” species on the basis of a single common parameter – that they construct nests generally within 0.5m of the ground. Thus, ecologically disparate species such as chiffchaff, herring gull and coot are homogenised into a single receptor with a standardised susceptibility to mammalian predation. The continued failure of the authors to properly explain, qualify or acknowledge the deficiencies of this approach is glaring. They either genuinely believe that vulnerable species such as lapwing, nesting on the ground, in open uncluttered environments such as arable fields, are at the same risk of predation from larger mammalian predators as a whitethroat in a bramble thicket, or they are wilfully building a massive source of obfuscation and bias into the methodology. Either way, it muddies the waters and fatally undermines the study.

Sadly, predetermined bias is not just restricted to the methodological design. It also infects the syntax of the discussion and conclusions of the paper. Most glaring perhaps is the abstract – the bit one can read for free – concluding with a wholly unsupported premise – that “this predator removal has not affected bird populations”. That might be the conclusion the authors from Natural England (and Defra) wish casual readers to take from the study, but for those who read the full paper, it’s not actually a conclusion supported by the analyses. I am surprised this statement survived the peer review process and that the BTO authors (at least) would allow such an unevidenced leap of logic. In contrast, the all-important last line of the conclusions calling for a landscape-scale quasi-experimental approach: “to provide stronger inference about the complex potential ecological effects of culling predators such as the badger” didn’t make it into the abstract. Strange that.

So, beyond the authors’ clearer acknowledgement of the fundamental limitations of the exercise, Ward et al. 2022 merely perpetuates the uncertainty that has presided over this question since the end of the Randomised Badger Control Trial, fifteen years ago. In other words, it does nothing to progress Defra’s, the Secretary of State’s, Natural England’s, conservationists or the wider public’s understanding of collateral ecological effects from badger culling any further forward from the position prior to the current cull starting in 2013. At all the junctures in time cited above, independent review has indicated that further investigation into the ecological side effects from badger culling was merited. All NE have actually done in the wake of their promise to a High Court judge in 2018 is commission a spectacularly coarse analysis which was never likely to deliver anything close to a useful answer, suppress the results for three years and now repeat it. A cynic might conclude that this is deliberate – a means to be seen to be doing something in the face of repeated legal challenges that exposed systemic failures by NE to properly assess impacts – whilst actually kicking the can down the road.

There is one paragraph worthy of note in the discussion of the results. Despite the continued determination of the authors to muddy the waters by casting the analytical net to include species of inherent low-vulnerability to predation by ground-based mammalian predators – such as nuthatch and green woodpecker (really, guys?), the authors do for the first time note and discuss separately the negative trends indicated for two of the species which actually ought to be the critical focus – lapwing and curlew. It is worthy of remark, at least, that such trends as there are for these species appear more or less consistently negative across all three iterations of BTO analysis. Finally, this has been remarked upon in Ward et al 2022. The problem of course is that this potential cause for concern should have triggered further targeted investigation – along the lines that the paper now suggests – much, much earlier. Not now, nearly ten years too late.

Repeating a near-pointless study again and again is, in my view, a poorly disguised exercise in obfuscation and delay. An excuse to do nothing more meaningful, just in case that gives you an awkward answer. But don’t listen to my cynicism and take my word for it. Read Ward et al. 2022 and ask yourself whether this is valuable and robust science being commissioned by Natural England and/or a good use of the time and resources of the BTO and of the data that it receives from volunteers. Do you think this type of data analysis exercise has any conceivable prospect of determining whether curlew in Somerset, redshank in Gloucestershire or stone curlew in Wiltshire are experiencing increased predation pressure as a consequence of badger removal? Do you agree with NE that ‘absence of evidence is evidence of absence’? Or alternatively, ‘if you can’t see the wood for the trees, it means there is no wood’.

If you would like to leave a comment about this blog you can do so at the end of the article on Mark Avery’s site here.

References:

Defra (2007) The ecological consequences of removing badgers from the ecosystem. Defra Project Report ZF0531. http://webarchive.nationalarchives.gov.uk/20071104143302/http://www.defra.gov.uk/animalh/tb/research/summary/zf0531.htm.

Food and Environment Research Agency (Fera) (2011). Evaluation of the Potential Consequences for Wildlife of a Badger Control Policy in England. https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/182478/badger-control-consequences.pdf 

Professor Sir Charles Godfray FRS (Chair); Professor Christl Donnelly FRS; Professor Glyn Hewinson; Professor Michael winter OBE; Professor James Wood. (October 2018) Bovine TB strategy review. Report to Rt Hon Michael Gove MP, Secretary of State, Defra. 
https://www.gov.uk/government/news/review-of-governments-bovine-tb-strategy-published 

Esther F. Kettel, Ivan Lakin, Matthew J. Heydon & Gavin M. Siriwardena (2020) A comparison of breeding bird populations inside and outside of European Badger Meles meles control areas, Bird Study, 67:3, 279-291,  DOI: https://www.tandfonline.com/doi/full/10.1080/00063657.2021.1889460 

Kettel, E.F. and G. M. Siriwardena 2018. Comparisons of breeding bird population and abundance trends within and outside two specified areas located in SW England. Unpublished (confidential) Report to Natural England. British Trust for Ornithology, Thetford, Norfolk, UK. V. Ward, M. Heydon, I. Lakin, A. J. Sullivan, G. M. Siriwardena. (2022) Breeding bird population trends during 2013–2019 inside and outside of European badger control areas in England. Journal of Zoology 108. https://zslpublications.onlinelibrary.wiley.com/doi/10.1111/jzo.13010