Outbreaks | Equine Disease Communication Center

Updates on current disease outbreaks are listed here as they occur and will include the date listed, disease name, location and current status. Specific premises will not be named but the general location by town, county and state will be listed. When locations, events or horses are at risk they will be listed. Updates will be posted as they are received.

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Equine Herpesvirus- Respiratory

Marion County, OR

Alert ID: 507

March 24, 2017

A horse with neurologic signs was diagnosed with equine herpesvirus myeloencephalopathy (EHM) in Marion County Oregon. The horse began showing acute neurologic signs on Saturday March 18 and was immediately referred to Oregon State University-College of Veterinary Medicine (OSU-CVM). The diagnosis was made on March 20 by a positive test for both the EVH-1 wild type and neurotropic genetic markers. When horse’s condition deteriorated, it was euthanized. All horses at the Marion County property have been quarantined and strict biosecurity measures initiated. A second location in Marion County with a high-risk contact horse has also been quarantined. Quarantined horses are being closely monitored and there is no indication at this time that the virus has spread to other horses beyond those being quarantined, and there are no traces to other states. The Oregon Department of Agriculture will continue to work closely with all involved parties and is monitoring the situation very closely. Owners with questions about the neurologic form of EHV-1 should contact their veterinarian.

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