JAMESTOWN, N.D. (NewsDakota.com) – A second horse has been euthanized after contracting EHM, a rare neurologic disease that affects horses.

The horse in Stutsman County became ill last Friday and was euthanized the following day according to the North Dakota Department of Agriculture. The horse tested positive in lab results, confirming that the horse had equine herpesvirus myeloencephalopathy.

This is the second case in North Dakota, following a well-known barrel racing horse who had contracted the disease in Bowman County. The state vet’s office has reached out to horse owners who will quarantine horses that were exposed to the mare within 72 hours before the onset of illness.

Other horses that may had contact within three weeks prior to becoming ill are recommended to see a vet.

The disease has caused numerous cancellations, including rodeos and fundraisers. It poses no threats to humans.