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BBC News reports on planned vaccination by National Trust in Devon

BBC NEWS - SCIENCE & ENVIRONMENT
20 April 2011, 03:01
Badger vaccine pilot planned by National Trust in Devon
By Richard Black, Environment correspondent, BBC News

The National Trust is to vaccinate badgers against TB this summer in a bid to curb the disease in cattle - the first UK landowner to do so.

Badger cubs playing
A decision to cull badgers could prove to be as controversial
as selling off nationally owned forests

The trust hopes its £320,000, four-year project on Devon's Killerton estate will make the case for vaccination as an alternative to culling.

Cattle (or bovine) tuberculosis costs the UK about £100m each year.

The government is set to approve badger culling in England soon, and the Welsh Assembly Government also plans a cull.

Research published last year showed the vaccine lowers infection in badgers.

Some cattle herds contract TB through contact with badgers, which carry the bacterium, although infection from other cattle is more significant.

Badger culling is a controversial option and although the trust is not opposed to it in principle, it is troubled by research showing it could do more harm than good - hence the vaccination scheme.

"This is a pilot project - it's not research, not a trial - we know the vaccine works, and we're going for it," said David Bullock, the trust's head of nature conservation.

"The driver is that we want to reduce the risk of bovine TB breakdowns in cattle herds belonging to our tenant farmers, 18 of whom are involved in this project - and we also want to see that the vaccine is considered nationwide."

Last December, scientists with the government-owned Food and Environment Research Agency (Fera) published the results of a four-year field trial using an injectable TB vaccine.

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"As the vaccine is preventative, [it is] unlikely to impact positively on infected badgers”
Melanie Hill
NFU regional director
============= 

It showed that vaccination reduced the incidence of TB in badgers by 74%, but did not look for any impact on infection levels in cattle.

The Labour government had planned five subsequent pilot vaccination projects, but the coalition reduced that to one, and Killerton was among the sites axed.

So at a cost of £80,000 per year, the National Trust is picking up the project, making use of the fact that some of the preliminary research (such as mapping out badger setts) has already been done.

Across about 20 sq km (8 sq miles) of the site, badgers will be lured into cages with bait and trapped.

Trained and licensed Fera staff will then deliver a dose of vaccine and release the badger, first marking it so it does not subsequently receive a second shot.

Dozens of setts have been identified, and the trust believes many hundreds of badgers will be vaccinated.

Promises made

The Conservative Party made badger culling a plank of their general election campaign last year.

Supporters of badger vaccination say it could reduce the need for cattle testing, or culling.

The National Farmers' Union (NFU) has demanded it for a long time and after the election Agriculture Minister Jim Paice - a farmer himself - announced a public consultation into how it should be implemented in England

While supporting the trust's decision to carry out the pilot programme, the NFU said vaccines formed part of the long-term solution but did not address the "desperate plight" that many farmers currently found themselves in.

"Current vaccination methods of injecting badgers is costly, and practically challenging with the benefits remaining unclear, and unproven," Melanie Hall, the NFU's regional director for South-West England told BBC News.

"As the vaccine is preventative, [it is] unlikely to impact positively on infected badgers."

Nationwide, nearly 35,000 cattle were slaughtered last year and there is no vaccine yet that can be used in cattle.

The government believes a cull would reduce disease incidence in cattle by 16% over nine years.

A spokesman for the Department of Environment, Food and Rural Affair (Defra) welcomed the National Trust's plans to run a vaccine pilot project.

He added: "There's no one solution to tackling TB, and the badger vaccine we developed is one of the tools we have available.

"We will be announcing a comprehensive and balanced TB Eradication Programme for England as soon as possible."

Ministers were expected to publish their plans to deal with bovine TB in the national herd in February; but amid turmoil over the disposal of nationally-owned forests, the announcement was postponed, and is now expected next month.

Meanwhile, the Welsh Assembly Government has announced new plans for a pilot cull in Pembrokeshire this year, after a legal ruling derailed similar plans last year.

Animal rights campaigners are to challenge the new plans in the courts.

Scientific cloud

Behind the issue lie conflicting interpretations of scientific evidence on the effectiveness of culling.

The Westminster and Cardiff governments and the NFU argue that culling can markedly reduce bovine TB incidence in cattle.

But the major UK investigation, the Randomised Badger Culling Trial (also called the Krebs trial), showed culling only produced a benefit if conducted rigorously and systematically over large areas, ideally with hard boundaries that badgers could not cross.

Otherwise, the social structure of badger groups broke down when some were killed, and the animals ranged further afield - infecting more cattle and leading to increased TB incidence.

"We're not against culling badgers if it's going to be effective in curbing bovine TB, but you can't apply the criteria everywhere that would make it effective," Mr Bullock told BBC News.

"Unless you have boundaries, you may have this effect where badgers move around and spread TB - we know from the science that this does happen."

Scientists who ran the Krebs trial have warned the government that its plan to allow shooting of badgers as they roam was likely to be less effective than the trap-and-shoot method deployed during the trial.

On that basis, they said, culling "risks increasing rather than reducing the incidence of cattle TB".

In the Irish Republic, culling has been practised for many years and does appear to have curbed bovine TB; but scientists involved with that programme say the disease will not be eradicated without vaccination.

The National Trust argues that vaccination could prove to be a more effective option than culling, in conjunction with tightened regulations designed to prevent cattle-to-cattle transmission.

This would also, of course, avoid killing badgers, which are a protected species under UK and EU laws.

Eventually, the aim is to have an oral vaccine that badgers would simply eat, avoiding any need for trapping; but that is thought to be five years away.

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BBC NEWS DEVON
20 April 2011 Last updated at 01:12
National Trust estate giving badgers TB vaccinations

Badger
The National Trust said vaccinating badgers was a "practical
step forward"

Badgers in a bovine tuberculosis "hotspot" on a National Trust estate in Devon are to be vaccinated as part of a four-year scheme, the trust says.

The scheme, which is to cost the trust £80,000 a year, will take place on the 6,400-acre Killerton estate in Exeter.

It aims to see if vaccination can be a viable alternative to culling badgers, which spread TB to cattle.

The work, which starts in May, will see government experts catch the animals, inject them and then catalogue them.

Vaccination 'most effective

The trust said vaccinating badgers was a "practical step forward" after recent field studies which showed it worked to reduce TB in the wild animals.

Almost 35,000 cattle were slaughtered last year as part of efforts to control bovine TB, which is a particular problem in areas including Wales and the South West of England.

Six months ago the government revealed plans to allow farmers to cull badgers as part of a series of "science-led" measures to deal with TB.

However, a bid to introduce a cull in Wales has been held up by legal action and the final go-ahead in England has also been delayed.

Eighteen tenant farmers will participate in the trust's programme. It will cover an area of almost 5,000 acres of farmland on the estate.

Staff from the Food and Environment Research Agency will catch, inject the mark caught animals to ensure they do not get re-injected.

Injecting the vaccine is currently the only way to administer it, although research and development of an oral vaccine which can be fed in bait to the animals is ongoing.

Mark Harold, director of the trust in the South West, said: "In many areas of the UK there are clearly practical problems in implementing an effective cull on badgers to reduce bovine TB in cattle.

"In these instances, vaccinations of badgers would appear to be the most effective ways of controlling the wildlife reservoir of the disease.

"This programme will show how badger vaccination can be deployed over a large area, and will pave the way for more widespread use of vaccination as an effective alternative to culling."

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