Food & Farming · Sunday, 23 August 2026

01 · Briefing · what happened

Britain's worst bluetongue outbreak arrives, and the vaccine is already gone

Food & Farming 3 min 16 sources

A midge-borne virus is tearing through British sheep and cattle in the hottest summer on record. The vaccine that stops it has run out, because barely one animal in ten was vaccinated last year.

10%

of livestock vaccinated

last year's uptake, which set this year's batch size [2]

48 hrs

to empty one vet's stock

20,000 doses at a Lockerbie practice, gone in two days [3]

456

confirmed UK cases by 19 August

with 1,657 more suspected and still being tested [1][5]

304

Devon premises with the virus

the worst-hit county, with 105 more sites in Cornwall [2]

At a glance

Britain is in the worst bluetongue outbreak its vets have seen, and the vaccine that prevents it has run out. [1][3]
About one animal in ten was vaccinated before this summer, so manufacturers built to a small order book. [2]
One Scottish practice had 20,000 doses on Monday morning and none 48 hours later. [3]
The vaccine is licensed in the UK but made in Europe, and there is no European stock left to import. [1]
Bluetongue does not infect people and does not affect food safety, but it kills sheep and leaves cattle infertile. [4]
Officials are asking farmers to keep ordering vaccine they cannot get, because the order book tells makers how much to build. [4]
A Devon farmer vaccinated 1,700 sheep and still expects up to 40% of his lambs to be born dead or disabled. [2]
It lands in a week when three-quarters of England is in drought and the cereal harvest heads for its worst since 1984. [8]

Forces in play

Midge season High↑

the virus keeps replicating while nights stay above about 12C, and Britain is heading for its hottest summer on record [2][8]

Vaccine supply High→

UK-licensed but made in Europe, with no European stock to import; one practice alone has 20,000 doses on a waiting list [1][3]

Movement controls Building↑

animals in Dumfries and Galloway can only move under licence, and from 10 September livestock entering Scotland must be vaccinated [4]

Disease surveillance Easing→

routine testing caught a single mad cow case in the same corner of Scotland within days, so the system built after the 1980s epidemic is still doing its job [6]

In play Defra and the chief vets — pressing farmers to order vaccine even while it is short, so makers can size next year's batch Livestock farmers — bought little last year when the risk looked distant, and want it all at once now Vaccine manufacturers — set this year's supply from last year's orders, and cannot compress the build Biting midges — carry the virus farm to farm, and were blown north into Scotland on the wind

How it unfolded

2023-24 the first bluetongue cases in the UK for 15 years [2]
Last season roughly one animal in ten is vaccinated [2]
Early August Scotland's first case, in an already-sick lamb at Creetown [3]
18 August the Dovedale sheepdog trials, run since 1891, are called off [5]
22 August Scotland reaches eight infected sheep; England confirms 19 new cases in a day [4]

Where this points

Watch the thermometer rather than the case count: the deputy chief vet says the virus keeps replicating in midges while average day and night temperatures hold above about 12C, so a warm autumn extends the season past the point new vaccine could arrive. [2]

Full briefing

The virus is not new and the vaccine is not new. What ran out is the manufacturing.

Bluetongue is carried by biting midges, not passed animal to animal. [4] Midges thrive in long hot summers, and Britain is about to record its hottest. [8] The government’s deputy chief vet, Ele Brown, gave the threshold plainly: while average day and night temperatures stay above about 12C, the virus keeps replicating inside the insects. [2] That is why Devon and Cornwall, warm and thick with livestock, hold most of the cases. [2] It is also why Scotland’s first case arrived on the wind, in a plume of midges blown north. [3]

The figures disagree, because each is a snapshot of a total that moves daily. Data released around 13 August put UK cases at 395. [5] By 17 August England alone was at 439; by 19 August the UK figure quoted was 456. [3][1] All three are right for their day. The number underneath matters more: Defra had 1,657 suspected cases still under investigation. [5]

The vaccine is the part that cannot be conjured. It is licensed in the UK but made in Europe, and a Bridgnorth farm vet said there is no European stock left to import. [1] John Hamilton, a vet in Lockerbie, had 20,000 doses on Monday morning and none 48 hours later. [3] What makes that predictable rather than unlucky is last year’s order book: uptake ran at roughly 10%. [2] A factory reads that as demand, and builds to it.

Mark Walter, in north Devon, vaccinated 1,700 sheep and injected over 400 with antibiotics. He still expects up to 40% of his lambs born dead or disabled. [2] The Dovedale sheepdog trials, run since 1891, were called off. Outside Covid, only foot-and-mouth in 2001 has done that. [5]

Elsewhere in the week, the heat did the work. Three-quarters of England is officially in drought and the cereal harvest is heading for its worst since comparable records began in 1984. [8] France expects a maize crop down 35% on last year, its smallest since 1980, with broccoli off 60% and artichokes down as much as 100%. [9] A Suffolk onion grower harvested three weeks early, yields down 40%, most bulbs under the 60mm supermarkets ask for. [10] Corn futures topped $5 for the first time in 18 months after a US crop tour came in short. [11][12] Growers had already bought fertiliser and fuel at war-inflated prices; roughly half the world eats thanks to synthetic nitrogen, whose cost tracks gas. [12][14] A UK salmonella outbreak linked to imported eggs has reached 207 cases and one death. [7]

Two things move the other way. Banks, insurers and food companies are funding farms that graze deep-rooted herbal pasture, which stayed green through the drought. [15] Researchers in North Yorkshire are growing lettuce and pak choi 1,000 metres down a working mine. [16] Against that, the Antarctic krill fishery hit its 620,000-tonne cap three months early, the second year running since the regional limits that spread the catch out expired. [13]

02 · Lesson · why it matters

Why the thing that saves you has to be built before anyone wants it

Nobody buys protection while they still feel safe, so the order that tells a factory to make it arrives only after it is too late to make.

How it works

Protection is cheap only before the danger arrives
While it still looks distant, few people buy it
Small orders tell the maker to build a small line
The danger arrives and everyone wants it at once
Building more takes longer than the danger lasts
So the shortage was set by last year's calm

The twist

The order that cannot be filled is still worth placing, because a factory cannot see fear, only orders - it is the one message you can send backwards to the version of the world that could still have acted.

Where you've seen this

Flu vaccine

makers commit to a batch size months before anyone knows how bad the season will be

Flood defences

pumps and barriers are wanted the week the river rises and built the decade before

Power grids

the big transformers everyone wants after a blackout take years to make

Blood banks

the blood that treats tonight's crash was given by strangers weeks ago

The catch

It only works if the maker believes the order. A rush of panic orders cancelled the moment the danger passes teaches a factory to build less - which is how capacity stays thin.

Full lesson

The shortage was decided a year ago

A vet in Lockerbie had 20,000 doses of bluetongue vaccine on Monday morning. By Wednesday he had none. In Shropshire a practice is holding 20,000 doses of unmet orders on a waiting list. There is no European stock to draw on, and the vaccine is made in Europe.

It is tempting to read that as a supply failure. It is easier to understand as an order that was never placed.

Last season, roughly one animal in ten in Britain was vaccinated. That is not a number a factory can ignore. A vaccine plant is a set of tanks and a schedule; the size of this year’s batch was chosen months ago, from what people bought last year. Ten per cent uptake is a message, and the message was: not much is needed.

Prevention is bought on a forecast, not on a feeling

Here is the trap, and it is not stupidity.

Every individual choice not to vaccinate last year looked correct at the time. The farmer whose lamb carried Scotland’s first case had thought her animals were far from the nearest outbreak. She was right about the distance. She was wrong about the wind, which carried infected midges across the border.

Prevention has a shape that makes this happen every time. Its cost is certain, immediate and yours. Its benefit is uncertain, delayed, and might never arrive at all, and if it works, you will never see the thing that did not happen. So people buy it late. And “late” for a vaccine means after the season has started, which is after the batch was set.

The clocks are different lengths

Two clocks run here, and they are not the same length.

The outbreak’s clock is fast. Midges are temperature-driven: while average day and night temperatures hold above about 12C, the virus keeps replicating inside them. A hot summer means weeks, not months, from a first case to hundreds.

The factory’s clock is slow. You cannot compress a vaccine build to match a midge. Every kind of protection has this problem. The gap between the two clocks is exactly the amount of time in which nobody can help you.

The order you cannot fill is still worth sending

Scotland’s deputy chief vet said something that sounds futile and is not. He asked farmers to keep ordering vaccine even now, when it cannot be supplied, because that is how manufacturers learn how much to make.

An unfilled order is not a purchase. It is a signal. A factory cannot see fear or read the news; it sees an order book. The queue of unmet demand is the only thing that tells it to build a bigger line for next year.

That is the single move available inside the gap between the clocks. It does nothing for this season’s lambs. It is the whole of what can be done for next season’s.

Who else is standing in this gap

The pattern is not agricultural. It is the shape of every stockpile.

Flu vaccine makers commit to a batch size months before anyone knows how bad the season will be. Flood pumps are wanted the week the river rises and built the decade before. The heavy transformers a grid needs after a blackout take years to make, and nobody orders them during good weather. Tonight’s transfusion was given by a stranger weeks ago, by someone who had no idea who it was for.

None of these run out because a factory failed. They run out because the demand signal arrives from the future, and the only people who could have sent it earlier were the ones who felt safe.

What this leaves us holding

The honest version has a catch, and it points at us.

A rush of panic orders that get cancelled the moment the danger passes teaches a factory the opposite lesson: build less, they never mean it. That is one reason capacity stays thin everywhere, in every kind of protection, year after year.

Which puts everyone inside it, not above it. A calm year is not a year in which nothing happened. It is a year in which all of us together quietly decided what would be available in the next bad one. Nobody noticed they were deciding.

03 · Lab · your turn

The Order Book

Rehearse ordering protection in the calm years, and feel how a factory sizes next season from the orders it got this one.

04 · Hope · carry this

A farmer in north Devon jabbed 1,700 sheep day and night, and a newcomer in Creetown worried most about neighbours she had never met. The vaccine will be short a while longer; that instinct never was.