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. While many horses may carry the virus without showing symptoms, outbreaks can occur, particularly in crowded environments like stables or during competitions. Vaccination and good management practices are essential for controlling the spread of this virus.