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

King County, WA

Alert ID: 780

December 26, 2017

Source: Washington State Department of Agriculture

On December 15, 2017 the Washington State Department of Agriculture confirmed EHV-1 in a 13-year old Halflinger gelding at one facility in King County, WA. 37 of 60 horses at the facility have now been tested with 16 horses confirmed positive for the Equine Herpes 1 neurotropic strain. Seven horses have been euthanized due to Equine Herpesvirus Myeloencepalopathy( EHM). Clinical signs of the EHM horses included 102-105 fevers, hind limb ataxia, no tail tone and dribbling urine. Treatment of horses include supportive care and anti-viral therapy. The attending veterinarian is making morning and evening rounds at the barn and evaluating fevers and clinical signs. The horse facility is still under quarantine and strict equine biosecurity in place. At this time no other horse facilities are reporting new cases in the state of Washington.

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