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Equine Herpesvirus Myeloencephalopathy (EHM) Outbreak
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Disease Alerts

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.



King County, WA
Outbreak Identifier: 7017
Alert ID: 4535
August 29, 2025
Confirmed Case(s) - No Quarantine

State Veterinarian Office and Attending Veterinarian

Number Confirmed: 1; 
Number Suspected: 13; 
Number Exposed: Unknown; 
Facility Type: Private Facility; 
Comments: Just reported to SAHO. Original horse came from CA first of June and infected the barn. Tested first of July. Under vet care.;