Equine viral arteritis virus (EVA) is a virus that primarily affects horses, causing a disease known as equine viral arteritis. This virus is part of the Arterivirus family and can lead to symptoms such as fever, swelling, and respiratory issues. It is particularly concerning in breeding stallions, as it can cause infertility and transmission to mares. EVA is spread through respiratory secretions and bodily fluids, including semen. Infected horses can be asymptomatic, making it challenging to control outbreaks. Vaccination is available to help prevent the spread of the virus, and awareness is crucial for managing equine health in affected populations.