Two positive cases of equine herpesvirus myeloencephalopathy (EHM) have caused the cancellation of the remainder of the Barrel Futurities of America (BFA) World Championship. The event was scheduled to run Nov. 17-22 at Lazy E Arena in Guthrie, Oklahoma.The event cancellation comes after the Oklahoma Department of Agriculture, Food and Forestry confirmed two cases of the neurologic form of EHV-1, equine herpesvirus myeloencephalopathy. Both positive horses traveled to Oklahoma from Waco, Texas, after participating in the Womens Professional Rodeo Association (WPRA) World Finals and Elite Barrel Race event Nov. 5-9.The Oklahoma Department of Agriculture, Food, and Forestry reports it is concerned that some of the same horses from the WPRA could have traveled to Oklahoma for the BFA World Championship. The Oklahoma state veterinarians office is recommending any horse that was present at the Lazy-E or at the WPRA to be isolated for 14 days upon returning home, mandatory performing and recording twice daily temperature checks to check for spikes of 101.5 or higher, and increased biosecurity measures around their home premises.The Texas Animal Health Commission (TAHC) has confirmed two positive cases and added that the extent of this outbreak is not yet fully known. Investigation into the character and epidemiology of this disease event is ongoing.Equine herpesvirus myeloencephalopathy is a neurologic syndrome caused by the EHV-1 virus. While EHV-1 is common in equine populations, the neurologic form of the disease is rare. Equine herpesvirus-1 is spread from horse to horse through contact with nasal discharge or inhalation of aerosolized respiratory droplets. Horses can contract the virus by encountering contaminated surfaces such as stalls, water, feed, tack, and transport vehicles. Humans can spread the virus from horse to horse through contaminated hands, clothing, and equipment. Proper biosecurity measures include extensive disinfection of surfaces and equipment.Horses can shed the virus during the two-to10-day incubation period before developing clinical signs. Equine herpesvirus myeloencephalopathy is a life-threatening condition. Owners that have horses that might have been exposed to horses at the WPRA in Waco, Texas, should contact their veterinarian.The EDCC will post more information on its Facebook pagehttps://www.facebook.com/EquineDiseaseCCand websitehttps://equinediseasecc.orgas it becomes available.To learn more about EHM, including signs, diagnosis, treatment, and prevention, please visit:https://equinediseasecc.org/equine-herpesvirus