Bluetongue: how to spot and report the disease

Bluetongue affects:

• sheep
• cattle
• other ruminants such as deer and goats
• camelids such as llamas

It does not affect people or food safety, but outbreaks can result in prolonged animal movement and trade restrictions.

The last outbreak in England, Scotland or Wales was in 2007.

CurrentLatest situation

Update 26 November 2023

StrainsFollowing active surveillance within the 10km temporary control zone (TCZ) a further 4 cases in cattle of bluetongue serotype 3 have been identified on 2 additional premises, all within the 10km TCZ and within 5km of the first finding near Canterbury, Kent. 

All 4 animals will be humanely culled to reduce the risk of onward transmission. 

There is no evidence that there is circulating virus in the midge population. The 10km TCZ remains in place and surveillance is ongoing.

Update 11 November 2023

Following routine bluetongue surveillance, a single cow has tested positive for bluetongue serotype 3 on a premises near Canterbury, Kent. A 10 km temporary control zone has been declared around the premises where the animal was kept. Movement restrictions apply to cattle, sheep and other ruminants.

Bluetongue risk

A number of different types (serotypes) of bluetongue are currently circulating widelyin throughout Europe including:

• France (strains BTV4 and BTV8) BTV-3
• Belgium (strain BTV 8)-4
• BTV-8

Bluetongue could spread intoto the UK if infected midges are carried across the channel by the windwind. toThe England.south and east coasts of England are at highest risk. The exact level of risk depends on the:

• level of disease in nearby areas of Europe
• weather conditions, particularly wind speed and direction
• temperature

Bluetongue could also spread into the UK if infected animals, blood or germinal products, are imported from countries where bluetongue is circulating.

Bluetongue has been reported in a number of European countries. See thethe  current current outbreak assessments and andthe topical theissues map of bluetongue outbreaks across Europepage for for more detail.

You should discuss the risks of of importing stock from from BTV affected affected countries with with your vet.

YouVaccination shouldis alsoavailable discussfor some types of bluetongue. You should discuss vaccinating your herd or flock with with your vet.

Movement licences

Animal movements out of the temporary control zone (TCZ) are not allowed until we have a better assessment of the disease situation. Movements into or within the zone are only allowed under licence.

However, you can apply for a specific movement licence if there’s an urgent and genuine welfare need to move animals, or you need to move animals from:

• a premises within the TCZ to another premises within the TCZ
• the free area into the TCZ permanently (for example, breeding stock)
• the free area or within the TCZ to go direct to slaughter within the TCZ
• the TCZ to go direct to slaughter at a designated abattoir in the free area within 100 miles of the premises of origin

How to spot bluetongue

If you keep livestock, you must continue to keep a close watch for, and report, any signssuspicion of bluetongue disease in your animals.

In sheep

Sheep are more likely to show obvious clinical signs of Bluetongue than cattle if they become infected. Signs of bluetongue in sheep include:

• ulcers or sores in the mouth and nose
• discharge offrom mucusthe eyes or nose and drooling from mouth and nose
• swelling of the mouth,lips, tongue, head and neck and the coronary band (where the skin of the leg meets the horn of the foot)

Other clinical signs include:

• red skin as a result of blood collecting beneath the surface
• fever
• lameness
• breathing problems
• abortion
• death

In cattle

Cattle are the main carriers of bluetongue. Signs of the disease include:

• lethargy
• crusty erosions around the nostrils and muzzle
• redness of the mouth, eyes, nose
• reddening of the skin above the hoof
• nasal discharge
• reddening and erosions on the teats
• elevated temperaturefever
• milk drop
• not eating
• abortion

MostAdult adultcattle animalsmay showserve onlyas milda clinicalsource signs,of orvirus showfor several weeks while displaying little or no clinical signs of disease atand all.are often the preferred host for insect vectors.

In calves

Calves can become infected with bluetongue (BTV-8) before birth,birth if the mother is infected while pregnant. Signs of infection include:

• calves born small, weak, deformed or blind
• death of calves within a few days of birth
• abortions

Livestock keepers and vets should consider bluetongue as a possible cause for calves showing these signs.

Photos of clinical signs

We’ve published some photos of clinical signs of bluetongue disease on Flickr.

How bluetongue is spread

MidgesBluetongue carryvirus theis bluetonguemostly virus.spread Theyby certain species of biting midges (Culicoides species), many of which can be found throughout Great Britain.

Midges are infected with the virus when they bite an infected animal.animal Theand the virus spreads when the infected midge then bites an uninfected susceptible animal. Once a midge has picked up thethe bluetongue virus BTV virus it will be a carrier for the rest of its life.life. 

The midgetime seasonof inyear the(midges UKare ismainly usuallyactive between April to November.November), Themeteorological weather,conditions especially(temperature, temperaturewind speed and winddirection direction,and affectsrain), topography and the proximity and density of neighbouring farms with susceptible animals are significant factors in a potential incursion and on how quickly, and how far midges can spread the disease.

Bluetongue virus can also be spread through biological products such as blood, germinal products (semen or embryos), or the movement of infected animals.

Infected pregnant animals can, under certain circumstances, transmit the virus to their unborn offspring. Once born, the infected offspring could act as a source of bluetongue virus.

The severity of the infection depends upon the serotype of the virus and may also be affected by strain. New serotypes continue to be identified but only serotypes 1-24 are notifiable.

Practice good hygiene when vaccinating animals

Bluetongue can also be transmitted through dirty needles.

Animal keepers and vets should follow good practice when treating and vaccinating animals at risk of being infected with bluetongue.

Preventing and controlling bluetongue

You can help to prevent the disease by:

• vaccinating your cattleanimals andwith sheepa againstsuitable bluetongue,authorised invaccine
• responsibly particularsource the BTV-4 and BTV-8 strainslivestock
• practising good biosecurity on on your premises.premises
• remaining vigilant

If you import animals, speak to your vet before you decide to import them.

If bluetongue is confirmedfound to be circulating then APHA will willplace controlmovement therestrictions outbreakin byzones followingaround the contingencyaffected planpremises. forFurther exoticdetails notifiableon diseasesactions andtaken in the bluetongueevent controlof strategy.

If there is an outbreak thenof APHAbluetongue willare placedescribed movement restrictions in zonesthe aroundGB thebluetongue affectedcontrol premises.strategy.

Vaccinating your animals

Vaccination is the best way to protect animals from the Bluetonguebluetongue virus.virus serotypes 1,2,4 and 8. You should discuss with your vet whether vaccination would benefit your business. There is no vaccine available for serotype 3.

You need toto comply getwith athe requirements of the general licence if you wish to vaccinate your animals iflocated they’re outside of a restricted zone for bluetongue.

It can take up to 6 weeks for your animals to be fully immuneimmune, as your animals mustwill haverequire a period of time for immunity to develop following vaccination and may require 2 injectionsdoses of the vaccine, 3 weeks apart.

Vets can apply to the Veterinary Medicines Directorate for a Special Import Certificate (SIC).

The certificate allows keepers to import safe and effective bluetongue vaccine directly from the EU to vaccinate their stock.

Importing animals from bluetongue affected countries

You should get advice from your vet about the risks and the health status of animals you want to import, before you import them.

If you import animals you should:

• make sure animals havecomply awith all of the requirements of the model health certificate to to confirm they’ve come from a bluetongue free country or, where a vaccine exists, the animal has been correctly vaccinated against the right strains of bluetongue - this will depend on which country you’re importing from
• fill in in bluetongue declaration GBHC172 if if transiting through a bluetongue restricted territory
• check if current issues relating to imports, exports and EU trade of animals and animal products  affect your import
• consider what additional guarantees the seller can provide - such as a pre-export test to prove immunitythe toanimal is not infected and has immunity to BTV
• consider pre-vaccinating your flock or herd against the relevant strains of bluetongue before introducing new animals

Movement restrictions will apply to cattle or sheep imported from countries where bluetongue is known to be circulating. These restrictions will apply until the animals have been tested and confirmed free of the disease.

Animals that test positive for bluetongue willmay be culled.culled or returned to the country of origin. Any animals which travelled in the same vehicle and are at risk of becoming infected may also be culled. No compensation will be paid for the culled animals.

All other animals on the premises that are at risk of becoming infected will be placed under movement restrictions. These restrictions will apply until it’s confirmed that the disease has not spread. These restrictions may last several weeks.

Bluetongue

Controlling legislation

outbreaks of bluetongue

TheFind mainout domesticmore legislationabout ishow the Bluetonguegovernment Regulationswill 2008.control Amendmentsan tooutbreak allowin:

• the vaccinationcontingency underplan licencefor wereexotic madenotifiable by diseases
• the bluetongue control strategy
• Bluetongue Regulations 2008
• Bluetongue (No.2) Order 2007
• Bluetongue (Amendment) Regulations 2012.
  which allows vaccination under licence