Equine viral arteritis (EVA) is a contagious viral disease that primarily affects horses. It is caused by the equine arteritis virus, which can lead to inflammation of blood vessels and various clinical signs, including fever, swelling, and respiratory issues. EVA can be transmitted through direct contact, respiratory secretions, or contaminated equipment. Infected stallions can become carriers of the virus, posing a risk for breeding programs. Vaccination is available to help control the spread of EVA, and it is important for horse owners to be aware of the disease, especially in breeding situations, to prevent outbreaks.