A UK farm vet’s frontline account of a bluetongue season gone from mild to devastating – and what it means for vaccination strategy in Ireland this autumn.
From the Vet Space Ireland podcast with Michelle Maguire and Richard Ryan (ArchersField Vets, Kilkenny), in conversation with Jonathan Hobbs, farm vet partner at North Park Veterinary Group, Devon, and Junior Vice President of the Sheep Veterinary Society.
A season that changed everything
When bluetongue virus (BTV) first reached the southeast of England in the autumn of 2023, it looked like a containable, one-off incursion. Midge plumes had blown the virus across the Channel from the Netherlands into Norfolk, Suffolk and Kent, and government surveillance picked up a handful of positive animals. Affected herds were culled, exclusion zones were set up, and the virus did not survive the winter. It seemed, for a moment, like a lucky escape.
It was not. Speaking on the Vet Space Ireland podcast, Jonathan Hobbs, a farm vet partner at North Park Veterinary Group in Devon and Junior Vice President of the Sheep Veterinary Society, walked through how that single incursion has grown into what he now describes as the UK farming equivalent of foot and mouth disease for his generation of vets.
In 2024 the virus arrived earlier in the season, giving it enough time to establish in the native midge population before winter. It spread from the southeast towards the Midlands and along the south coast, and crucially, it overwintered. By 2025, helped by a prolonged heatwave and drought that accelerated both midge activity and viral replication in the insects, bluetongue exploded across sheep and cattle farms in the southwest of England.
“Last year was our warning shot. This year is the Dutch experience we were scared of two years ago, where twenty per cent of the national flock was killed.”
– Jonathan Hobbs
What it looks like on farm
The species picture is stark. Sheep are by far the worst affected, followed by cattle, while goats are almost always asymptomatic and camelids remain at some risk. On the practice’s worst-hit farms this season, up to seventy-five per cent of clinically affected sheep have died, which works out at roughly twenty per cent total flock mortality once morbidity and mortality are combined.
Clinical signs in sheep include painful erosions on the dental pad, cuts and crusting around the mouth and nose, swollen heads, and lameness from coronary band involvement, signs that in previous years might have been mistaken for insect stings or adder bites. Cattle tend to show milder signs, including a reddened or crusty nose, swollen teats, reduced milk yield, and some lameness. Hobbs noted that cattle cases are often overshadowed by the sheer volume of sheep cases coming through the door, even though they are almost certainly under reported.
- Sheep: dental pad erosions, mouth ulceration, crusty or swollen nose, swollen heads, coronary band lameness
- Cattle: nose reddening or crusting, swollen teats, milk drop, lameness, generally milder disease
- Goats: almost always asymptomatic
- Camelids: at risk of clinical disease
There is no animal to animal spread. Bluetongue moves exclusively via infected midges, which is a key point of reassurance when ruling out other notifiable diseases, though Hobbs stressed that every suspect case still needs to be tested, both to confirm the strain and to rule out foot and mouth disease on farms where clinical signs could overlap.



Vaccination works, and the economics are stark
Hobbs was unambiguous: the vaccine is highly effective, and the practice’s own numbers back it up. North Park achieved roughly fifteen per cent vaccine uptake among eligible stock last year, against a national average of just five per cent, and farms that vaccinated ahead of last spring avoided the barren rates and dummy calf presentations that hit unvaccinated herds hard at scanning and calving.
Out of around sixty confirmed cases at the practice this season, only one has occurred in a previously vaccinated animal, a dairy cow with a complicating BVD persistently infected animal issue on farm that likely affected her vaccine response. Hobbs was also clear that farmers should not hold back on vaccinating bulls and rams despite cautious vaccine data sheet wording. The testes are an immune privileged site, meaning bluetongue virus can persist and shed in semen for months even after an animal has cleared the virus from its bloodstream, with normal semen morphology and motility masking underlying fertility damage. A short, mild vaccine reaction is a far smaller risk than a week or more of fever and illness, or worse, from natural infection.
“A dead bull is going to give you exactly zero calves. A vaccinated bull who might be off for a day is still going to give you plenty.”
– Jonathan Hobbs
The financial case is equally direct. Using an average lamb value of around one hundred and forty pounds a head, a thousand head flock facing twenty per cent mortality could lose in the region of twenty eight thousand pounds. Vaccinating that same flock costs roughly two and a half thousand pounds. As Hobbs put it, that is cheap insurance against a loss that is now playing out on farms across the south west.
Vaccine supply has struggled to keep pace with the sudden surge in demand this season, with wholesalers issuing stock in unpredictable drops rather than the reliable next day delivery practices are used to. Hobbs’s advice to farmers who have not yet vaccinated is to order early rather than wait, given that the peak bluetongue season typically runs from September through November as viral load builds through the autumn.
Reading the case numbers with caution
One of the most important points Hobbs raised concerns how bluetongue statistics are reported in the UK. Government figures record a “case” as an affected holding, not an affected animal, and testing authorities sample only three animals per holding. A single reported case can therefore represent dozens of dead or affected animals on one farm, while a headline figure of a few hundred cases nationally can understate the true scale of an outbreak considerably.
This matters for how the disease is perceived from a distance. Vets and farmers in areas not yet affected, or in countries like Ireland looking at the UK situation from across the Irish Sea, can easily read modest national case counts and conclude the risk is overstated. Hobbs’s message was the opposite: by the time the numbers look alarming, the disease is already established and difficult to control.
What this means for Ireland
Ireland recorded a small number of bluetongue cases in the latter part of last year, and Hobbs believes that was likely sufficient for the virus to have overwintered here. His reading of the UK’s own trajectory, a quiet first year followed by a far more severe second season once the virus reaches a critical mass in the local midge population, is a direct warning for Irish practices and farmers this autumn and into next spring.
Bluetongue was also compared during the conversation to Schmallenberg virus, which is carried by the same Culicoides midge and is already well established in parts of the southeast of Ireland. Hobbs described bluetongue as essentially “Schmallenberg on steroids”, a useful shorthand for vets explaining the risk to clients who may already be familiar with Schmallenberg’s fertility impacts but have not yet seen a bluetongue case.
His central message for Irish vets and farmers is not to be lulled by a mild season. A low case count this year does not mean the risk has passed, it may simply mean the outbreak has not yet reached the threshold it needs to explode the following spring. Supporting general herd and flock health, including worm control, mineral status and nutrition, also appeared to reduce case severity and improve response to treatment on affected UK farms, alongside vaccination as the primary defence.
Sheep Veterinary Society conference, Kilkenny
Hobbs also used the conversation to flag the Sheep Veterinary Society’s autumn conference, taking place in Kilkenny from Monday the 28th to Wednesday the 30th of September. The Society is a specialist division of the British Veterinary Association, open to international members including vets in Ireland, with annual membership priced at around seventy pounds.
The three-day conference costs under five hundred pounds and includes international speakers on bluetongue alongside Irish parasite specialists, with at least half a day dedicated to vets presenting clinical cases from their own practices. Hobbs, who takes over as Society president at the event, described it as a genuinely clinically focused meeting, with much of the value coming from informal conversation between sessions. For more information go to – sheepvetsoc.org.uk
This article is based on a conversation recorded for the Vet Space Ireland podcast. Listen to the full episode at vetspaceireland.ie.
Article written by Vet Space Ireland
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