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Guidance

Bluetongue: how to spot and report it

The signs of bluetongue virus, how you must report it and what happens when you do.

Applies to England

Bluetongue is a notifiable disease caused by infection with bluetongue virus. Bluetongue virus is mainly spread by biting midges.

Bluetongue virus affects:

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

Rarely, bluetongue can affect dogs and other carnivores if they eat infected material (such as aborted material and afterbirth).

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

Find out about current bluetongue cases, risk levels, vaccinations and restrictions.

Signs of bluetongue

If you keep livestock, you must keep a close watch for and report any suspicion of bluetongue in your animals.

The severity of the infection depends on the type (serotype) of the virus and may also be affected by the strain.

In sheep

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

  • ulcers or sores in the mouth and nose
  • discharge from the eyes or nose and drooling from mouth
  • swelling of the 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, foetal deformities and stillbirths
  • death

In lambs

Lambs can become infected with bluetongue virus before birth if the dam is infected while pregnant. Signs of infection include:  

  • lambs born small, weak, deformed or blind  
  • death of lambs within a few days of birth  
  • stillbirths 

In cattle

Signs of bluetongue in cattle 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
  • fever
  • milk drop
  • not eating
  • abortion, foetal deformities and stillbirths

Adult cattle may be infectious for several weeks while showing little or no sign of disease. They are often the preferred host for biting midges (the vector of bluetongue virus).

In calves

Calves can become infected with bluetongue virus before 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
  • stillbirths

Photos of signs of bluetongue

Credit: The Pirbright Institute.

A photo of a sheep with its mouth open showing a blue and swollen tongue.

Credit: The Pirbright Institute.

A photo of a sheep with its open mouth open showing ulcers on the gums.

Report suspected bluetongue

Bluetongue is a notifiable disease. This means if you do not report it, you’re breaking the law.

Veterinary surgeons in England

You can report suspected cases of bluetongue using our form if you are a registered veterinary surgeon.

Before you report bluetongue, have the following information ready:

  • your RCVS registration number
  • County Parish Holding (CPH) number of the premises (if there is one)
  • livestock keeper’s contact details
  • total number of animals
  • number of affected animals
  • clinical signs of disease observed

You will also be asked to:

  • confirm that you do not suspect foot and mouth disease on this premises
  • declare that the clinical signs you observed are consistent with bluetongue
  • confirm that you have the necessary knowledge to diagnose bluetongue in the animals examined, based on the clinical signs observed

You can confirm your knowledge by either:

This will enable APHA to confirm disease based on the information you submit. APHA may contact you, or the livestock keeper, if more information is needed.

Start now

Call 03000 200 301 if you cannot access the form or need to discuss the clinical signs you are seeing.

Livestock keepers in England

Contact your private vet or call 03000 200 301 immediately if you think an animal may have bluetongue, or you are concerned about an animal’s health or welfare.

If you suspect any other notifiable disease in your animals, report it immediately by calling 03000 200 301.

In Wales (veterinary surgeons and livestock keepers)

Call 03003 038 268 to report bluetongue in Wales.

In Scotland (veterinary surgeons and livestock keepers)

Call 03000 600 704 to report bluetongue in Scotland.

What happens after reporting

Find out what happens when you report a notifiable disease in your animals.

Preventing and controlling bluetongue

Find out how to prevent bluetongue and stop it spreading.

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