A mare on a property in the upper Hunter Valley near Scone has been euthanised after the deadly Hendra virus was detected.
The DPI (Department of Primary Industries) said the horse developed neurological signs late last week and was euthanised.
NSW Health said it was undertaking a risk assessments of people who may have have had contact with the affected horse.
No other horses in the area have been reported to have the virus.
Scone is labelled as the “horse capital of Australia” with some of the biggest studs in the country residing in the area.