Equid alphaherpesvirus 3, also called Equine herpesvirus 3 (EHV-3), is a virus of the family Herpesviridae that affects horses.

The disease is spread through direct and sexual contact, contaminated handlers and equipment, and possibly through flies carrying infected vaginal discharge.

[3] Signs of the disease include often painful pustules and ulcerations of the vagina, penis, prepuce, and perineum.

Carrier animals can sometimes be identified by spots of pigment loss on dark skin in the genital region.

It is important to always maintain good hand hygiene before and after touching the genital area in all horses, and clean instruments, as the virus can be spread by contaminated hands or equipment.