Within the last few weeks, 18 horses have been reported to have contracted the potentially deadly equine herpes virus-1 in California.

According to the California Department of Food and Agriculture, horses affected by the virus typically display symptoms such as fever, lethargy, nasal discharge, hind-limb weakness and lack of coordination. Horses may also experience difficulty standing and urinating.

While there is no risk of humans contracting the virus, it is considered to be highly contagious and airborne. There is also no vaccine to prevent the spread of this virus.

In response, Utah State Veterinarian, Dr. Bill Barton has recommended that horse owners incorporate strict movement controls or containment methods to prevent the spread of the disease.

All 18 horses that have been reported to have contracted the virus have already been placed under quarantine according to the California Department of Food and Agriculture.

It is believed that the horses became ill after coming into contact with a sickly horse that had participated in cutting events at a horse show in Bakersfield, where two horses were found to have the virus on May 13.

However, organizers of the Memorial Day Classic, a weeklong riding show in Los Angeles, are claiming that fears over the outbreak may be unwarranted and should not prevent visitors and horses from participating in the event.