BISMARCK – The North Dakota State Veterinarian’s Office has been made aware of an outbreak of Equine herpesvirus-1 (EHV-1) and equine herpesvirus myeloencephalopathy (EHM) in horses that were at or associated with barrel racing and rodeo-type events in Texas and Oklahoma. Several cases of EHM have been confirmed in Texas and Oklahoma associated with these equine events, with numerous reports of additional cases and equine deaths pending investigation.
There are currently no confirmed cases of EHV-1 or EHM in North Dakota. The North Dakota State Veterinarian’s Office has is coordinating with the affected states and has received trace information from Texas and Oklahoma. Those North Dakota horse owners will be contacted directly and quarantines issued to mitigate further spread of the disease.
“This outbreak serves as a reminder of the potential disease risks associated with large commingling equine events,” State Veterinarian Dr. Ethan Andress said. “It underscores the importance of timely reporting of diseases and ensuring that movement requirements are followed, including veterinary inspection and health certificates prior to travel.”
EHV-1 can be spread by direct contact, through the air, and on contaminated equipment, clothing and hands. Biosecurity measures that can reduce the risk of spreading the disease include avoiding shared food or water containers and preventing nose-to-nose contact.
Any equines entering North Dakota for any length of time must be accompanied by a certificate of veterinary inspection.
“If your horses traveled to Texas, Oklahoma, or other equine events where EHV-1 exposure may have occurred, please contact our office directly,” Andress said. “We will provide guidance regarding isolation and monitoring. Prevention starts by keeping sick animals at home and being aware of the risk factors while traveling and competing.”
EHV-1 can cause respiratory disease, abortion, neonatal death and sometimes the neurologic form of the disease, EHM. Current EHV-1 vaccines may reduce viral shedding but are not protective against the neurologic form of the disease.
“These incidents serve as a reminder to work with your local veterinarian on preventive programs for all species,” Agriculture Commissioner Doug Goehring said.
Although highly infectious and contagious among horses, EHV-1 poses no threat to human health.
The State Veterinarian’s Office may be reached at 701-328-2655.