- 13 May 2019
Equine viral arteritis (EVA) is a contagious disease caused by the equine arteritis virus.
The virus occurs worldwide, including mainland Europe, in thoroughbred and non-thoroughbred populations. It does not affect humans.
Cases of equine viral arteritis have been confirmed in England. Read the details of EVA cases on the gov.uk site.
There is no risk to public health and currently no cases reported in Scotland. Restrictions on breeding have been put in place on the animals to limit the risk of the disease spreading.
If you suspect the disease in Scotland, contact your local Field Services Office.
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
- lethargy and stiff movement
Some infected horses will show no clinical signs.
How equine viral arteritis is spread
EVA can be spread through:
- artificial insemination
- contact with aborted foetuses
- contaminated equipment
- on the breath of infected animals for up to two weeks
Stallions can carry the disease for extended periods without showing clinical signs. They can spread the disease through sexual contact or if their semen is used to artificially inseminate a mare.
Mares can spread the disease during pregnancy to their foals, or through milk, or to a stallion from further mating.
You can help prevent the disease by vaccinating horses and ponies against the disease.
Human health implications
There are no human health implications because the disease is not zoonotic.
How to control the disease
An outbreak will be controlled in line with the contingency framework for exotic notifiable animal diseases.
You can help prevent this disease spreading by following the Horserace Betting Levy Board’s (HBLB) Codes of Practice.
In Scotland, EVA is notifiable by law under the Equine Viral Arteritis Order 1995. Under the Order, anyone who owns, manages, inspects or examines a horse must notify their local Animal Health and Veterinary Laboratories Agency Office when:
- they suspect the disease in a stallion, either on the basis of clinical signs or following blood or semen testing
- they suspect disease, either on the basis of clinical signs or following blood testing, in a mare that has been mated or artificially inseminated within the past 14 days
The policy on disease control is that prevention is better than cure. This approach works by reducing the chances of a disease entering the animal population, and if it does then it can be quickly spotted and dealt with through the preventative measures.
You can help prevent disease by practising strict biosecurity on your premises. Our equine biosecurity guidance outlines practical, day-to-day actions that can be easily adopted in order to reduce the potential for the introduction or spread of disease-causing agents.
If you suspect signs of any notifiable diseases, you must immediately notify your Scotland: field service local office at the Animal and Plant Health Agency (APHA). Failure to do so is an offence.