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CDFA Confirms EHM, EHV-1 Cases

July 2, 2018
Posted by Michelle Anderson

The cases, which originated from the same facility in San Mateo County, California, are currently under quarantine.

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In many horses, the only sign of EHV-1 infection is fever, which can go undetected. | Photo: Kevin Thompson/The Horse

Veterinarians confirmed a 15-year-old pony mare displaying neurologic signs of equine herpesvirus myeloencephalopathy (EHM) on June 27, 2018. The mare originated from a San Mateo County facility, and an additional horse originating from the same property—a 24-year-old Tennessee Walking Horse mare—displayed a fever and tested positive for equine herpesvirus-1 (EHV-1).

Authorities have isolated and placed both mares under quarantine, and enhanced biosecurity is in effect. Exposed horses will be monitored for clinical signs, and temperatures will be taken twice daily. Any horse displaying a fever or compatible clinical signs will be tested. The California Department of Food and Agriculture (CDFA) will continue to monitor the situation and release new information as it becomes available.

Equine herpesvirus infection in horses can cause respiratory disease, abortion in mares, neonatal foal death, and neurologic disease. EHM might be caused by damage to blood vessels of the brain and spinal cord associated with EHV-1 infection. It’s often due to the neuropathogenic strain of EHV-1 but can occasionally be caused by the non-neuropathogenic strain of the virus

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Written by:

Michelle Anderson

Michelle Anderson is the former digital managing editor at The Horse. A lifelong horse owner, Anderson competes in dressage and enjoys trail riding. She’s a Washington State University graduate and holds a bachelor’s degree in communications with a minor in business administration and extensive coursework in animal sciences. She has worked in equine publishing since 1998. She currently lives with her husband on a small horse property in Central Oregon.