CHEYENNE, Wyo. (AP) — Two cases of the neurologic form of Equine Herpes Virus Type 1 have been discovered in northwestern Wyoming.

The Wyoming Livestock Board reports that that a total of seven horses in Teton and Park counties were affected by the disease.

One horse had to be euthanized, while the remaining horses were placed under quarantine.

State veterinarians have determined that the two incidents are unrelated, and no new cases have been reported in the two counties.

The Equine Herpes virus is highly contagious, but the neurological form of it is rare. It appears suddenly and is usually rapidly progressing. The disease typically causes horses to develop a fever, lose control of their extremities and can result in death.