State Veterinarian Dr. Richard Wilkes says the horse was euthanized Friday.
The horse lived on a farm in The Plains in Fauquier County.
Wilkes says an investigation by the Virginia Department of Agriculture and Consumer Services didn't find any other horses displaying signs of the disease, Equine Herpesvirus Myeloencephalopathy, or fevers. But horses on the farm will remain under quarantine for 21 to 28 days from the last exposure to the virus.
Horse owners are advised to continue practicing strict biosecurity.
The disease is often fatal. It's caused by the Equine Herpesvirus-1. Symptoms may include a fever, nasal discharge, wobbly gait, hind-end weakness and dribbling of urine.
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