The Pennsylvania Department of Agriculture announced May 18 the quarantine of a barn in Tionesta, in Forest County, after a horse residing there tested positive for equine herpesvirus-1 (EHV-1) on May 13.

A horse from the Forest County barn was used in the Tionesta Wounded Warrior Horseback Scavenger Hunt, where 94 horses—including horses from Ohio and West Virginia—took part.

Another barn in Shippenville, in Clarion County, housing an exposed horse that showed clinical signs of EHV-1 was put under precautionary quarantine on May 14, until the pending laboratory results are confirmed. Two additional horses from the Forest County barn have shown signs of illness after being exposed to the positive horse.

The Pennsylvania Department of Agriculture is in the process of tracing the horses that participated in the scavenger hunt, and has notified animal health officials in Ohio and West Virginia

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