Equine Herpesvirus (EHV) is a viral infection that affects horses, caused by several strains of the herpesvirus. It can lead to respiratory issues, neurological problems, and reproductive failures in mares. EHV is highly contagious and can spread through direct contact, contaminated equipment, or even airborne particles. There are several types of EHV, with EHV-1 and EHV-4 being the most common. Vaccination is available to help prevent the disease, but it is not 100% effective. Horse owners should be vigilant about hygiene and monitor their animals for any signs of illness to control outbreaks effectively.