11/20/2025
We have gotten a lot of questions regarding Equine herpes virus the last few days and have heard a LOT of misinformation. There is a confirmed outbreak of EHV 1 in Texas linked to a rodeo event, horses at this event in Texas could have been exposed and spread the virus when returning home. Several horses associated with the outbreak have developed the neurological form and were euthanized. At this time there is no confirmed case in NC.
If you traveled with your horse out of state and especially to the Texas event then we recommend isolating and checking temperatures for 2 weeks after returning. If your horses do not leave the farm and no new horses are introduced then your horses are NOT at risk during this outbreak. You can disinfect clothing and boots if traveling between farms to reduce risk of accidental spread. Spread of EHV is primarily by DIRECT CONTACT with an infected horse or equipment that horse has come into contact with like water buckets.
There is a vaccine that will protect against respiratory disease and abortion associated with EHV. If your horse travels or horses on the property travel to even local shows it is recommended to vaccinate twice yearly. If your horse does not have the vaccine isolating at home will protect your horse.
For more information see the AAEP fact sheet
What is Equine Herpesvirus (EHV)?
You've probably heard it called Rhinopneumonitis, a respiratory tract disease that results in "snotty noses," but EHV is more than that. Depending on the strain, this virus can also cause abortion in broodmares, and equine herpesvirus myeloencephalopathy (EHM) — the often-deadly neurologic form of the disease.
Because EHV is endemic in many equine populations, most mature horses have developed some immunity through repeated natural infection. However, they remain a source of infection for other susceptible horses, like weaned foals and yearlings, who usually display symptoms of the respiratory form of the disease in autumn and winter. Performance and show horses are also more vulnerable to the disease, as they commingle with unfamiliar equines in close quarters while under stress from travel and competition.
Proper biosecurity protocols can help reduce EHV outbreaks and other disease transmission. A variety of vaccines are also available for protection against both the respiratory and abortive form of the disease, but there is no equine licensed vaccine at this time that has a label claim for protection against the neurologic form (EHM).
Consult your primary equine veterinarian to learn more about this disease and work with them to determine the optimal vaccine protocol for your horses.
You can learn more about all three forms on the Equine Disease Communication Center's website here: https://equinediseasecc.org/infectious-diseases