Equine viral arteritis: how to spot and report the disease


Two cases of Equine Viral Arteritis were confirmed in non-thoroughbred stallions on a premises in Dorset on 4 April 2019.  Read our advice regarding this disease.


Equine viral arteritis: how to spot and report the disease

  • How to spot equine viral arteritis, what to do if you suspect it and measures to prevent its spread.
  • Equine viral arteritis affects horses, donkeys and other equids.
  • It doesn’t affect humans.


Equine viral arteritis is a notifiable disease in:

  • stallions (male horses)
  • mares (female horses) that have mated or been inseminated within 14 days

If you suspect the disease you must report it immediately by calling the Defra Rural Services Helpline on 03000 200 301. In Wales, contact 0300 303 8268. In Scotland, contact your local Field Services Office. Failure to do so is an offence.


Latest situation

Two cases of Equine Viral Arteritis have been confirmed in non-thoroughbred stallions on a premises in Dorset on 4 April 2019. There is no risk to public health.

Restrictions on breeding have been put in place on the animals to limit the risk of the disease spreading and further investigations are ongoing. The animals affected are not racehorses and there is no indication that upcoming racing events will be affected. Further information is available in our press release.

How to spot equine viral arteritis

Signs of equine viral arteritis can include:

  • conjunctivitis (bloody tissue around the eye known as ‘pink eye’)
  • swelling of testicles or udder, also around eyes and lower legs
  • abortions (failed pregnancies in mares)
  • fever and runny nose
  • depression
  • lethargy and stiff movement

Some infected horses will show no clinical signs.

How equine viral arteritis is spread

Equine viral arteritis can be spread through:

  • mating
  • artificial insemination
  • contact with aborted foetuses
  • on the breath of infected animals

Stallions can carry the disease for extended periods without showing clinical signs and spread the disease through sexual contact or if their semen is used to artificially inseminate a mare.

Preventing and controlling equine viral arteritis

You can help prevent the disease by:

  • vaccinating horses and ponies against the disease - talk to your vet for advice
  • practising good biosecurity on your premises, especially if you’re involved in breeding

If you suspect equine viral arteritis, APHA vets will investigate.

If equine viral arteritis is confirmed the outbreak will be controlled in line with the contingency plan for exotic notifiable diseases.

Stallions suspected of having equine viral arteritis may be banned from use in breeding, along with semen from that stallion.

Further information on prevention and control

Controls to prevent disease

What happens when a notifiable disease is suspected or confirmed

Legislation relating to equine viral arteritis

Equine viral arteritis is covered by the Equine Viral Arteritis Order 1995.

Help us improve Gloucestershire Trading Standards

Don’t include personal or financial information like your National Insurance number or credit card details.