Understanding and minimizing the Threat of Equine herpsesvirus (EHV)
Equine herpesvirus (EHV) is a highly contagious virus that affects horses and other equines. Several strains exist, but EHV-1 is most associated with serious illness. EHV is a contagious virus spread through close horse-to-horse contact, shared equipment, and contaminated environments. Some strains can cause serious neurologic disease (EHM).
Protecting horses and other equines
All equines, including horses, mules, donkeys, and others, are vulnerable to EHV. Symptoms vary depending on the strain, but may include: Fever, nasal discharge, malaise, pharyngitis, and cough. EHV-1 may also cause late term abortions or neurologic disease.
Because EHV spreads quickly between equines, early recognition and immediate isolation are critical.
Protect your horses:
Because EHV spreads quickly between equines, early recognition and immediate isolation are critical.
Protect your horses:
- Isolate new or returning horses for 14-21 days.
- Don't share halters, water buckets, tack, or grooming tools.
- Clean and disinfect stalls, trailers, and equipment between horses.
- Monitor daily for fever, nasal discharge, or changes in behavior.
- Call your veterinarian if your horse shows signs of illness.
EHV-1 outbreak in Texas and Oklahoma
We are tracking the current outbreaks in Texas and Oklahoma.
Texas Department of Agriculture alert
Equine Disease Communication Center notice
Texas Department of Agriculture alert
Equine Disease Communication Center notice
EDCC EHV-1 video
Below is the recording of a webinar held November 25, 2025. Please note that the current EHV-1 situation is changing rapidly. To get the most updated information, please consult the Equine Disease Communication Center (EDCC) website at https://equinediseasecc.org.
Our panel of experts on this subject are Dr. Bud Dinges, Texas State Veterinarian, Dr. Katie Flynn, Senior Veterinarian on Equine Health and Biosecurity for US Equestrian, and Dr. Krista Estell, Infectious Disease Specialist at Virginia Tech’s Marion duPont Scott Equine Medical Center and a member of the AAEP’s Infectious Disease Committee and EDCC subcommittee. The discussion begins with an overview of EHV-1 and EHM by Dr. Estell. Next, Dr. Dinges shares his state's process of handling the current outbreak. We finish with Dr. Flynn discussion biosecurity practices and prevention of disease spread.
Our panel of experts on this subject are Dr. Bud Dinges, Texas State Veterinarian, Dr. Katie Flynn, Senior Veterinarian on Equine Health and Biosecurity for US Equestrian, and Dr. Krista Estell, Infectious Disease Specialist at Virginia Tech’s Marion duPont Scott Equine Medical Center and a member of the AAEP’s Infectious Disease Committee and EDCC subcommittee. The discussion begins with an overview of EHV-1 and EHM by Dr. Estell. Next, Dr. Dinges shares his state's process of handling the current outbreak. We finish with Dr. Flynn discussion biosecurity practices and prevention of disease spread.
Report suspected cases of EHV to:
- State Veterinarian's Office (360) 902-1878 or ahealth@agr.wa.gov