11/20/2025
There has been a lot of information and reports on social media regarding the Equine Herpesvirus outbreak that is connected to the WPRA Finals in Texas and exposed horses at the BFR in Oklahoma this past week.
There is a lot of information being shared – not all of which is accurate – but is causing concern for local horse owners. We have been receiving numerous calls about this outbreak and hope the information below will provide additional information and recommendations for keeping your horses safe.
We will post again with more information and recommendations as we receive more information from the Indiana State Veterinarian and Board of Animal Health.
What is Equine Herpesvirus (EHV)?
EHV is a viral disease that is spread from horse to horse through nasal discharge, aerosolized droplets and contaminated tack, equipment or people. The incubation period is 2-10days. As it is a herpesvirus, horses can be carriers and only shed when under stress (transportation, competition). The virus can be shed before any clinical signs are noted. EHV can cause respiratory, neurologic and abortive disease. There are particularly virulent strains that cause severe neurologic disease that we call equine herpesvirus myeloencephalopathy. These have a higher mortality rate. Vaccination does not protect horses against these strains.
What if my horse was exposed?
- Quarantine all exposed horses for 14-21 days. If possible, stall them in a barn away from any other horse contact and ensure that proper biosecurity measures are in place
o For example, use protective boots and dedicated barn clothes when handling exposed horses. Do chores, medications, and handle all unexposed horses before taking care of any quarantined animals.
- If you’ve hauled exposed – or potentially exposed – horses, make sure to clean out all organic material (manure, hay, etc), powerwash well, then spray with disinfectant (1:10 water:bleach is appropriate) and allow to dry fully to kill the virus
- Monitor temperatures twice daily and call your veterinarian if they develop a fever 101.5F or higher.
How do I protect my horses from exposure?
- Limit all horse movement in and out of the barn. For now, avoid attending shows, races, or open riding sessions with horses that do not live in the same barn.
- EHM is caused by a mutation of EHV-1, which is included in our regular vaccination protocols. While there is no guarantee of protection against the EHM mutation, making sure your horses are up to date on vaccines could protect from EHV-1 infection.
What if I need to haul my horses or have an emergency?
- If your horses have been exposed to this virus or you attended either of these shows, please inform our office when scheduling any routine or emergency appointments so we can take the appropriate precautions to protect our patients and hospitalized cases.
If you have any questions about this situation specifically, please feel free to contact our office at 574-633-2146 or [email protected] and we will have one of the doctors get in touch with you.
https://www.equinediseasecc.org/
https://aaep.org/resource/ehv-faq-for-owners/
FAQ: Regarding Equine Herpesvirus (EHV)