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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.



Montgomery County, PA
Outbreak Identifier: 6760
Alert ID: 4318
April 22, 2025
Quarantine Released

Attending veterinarian

Number Confirmed: 5; 
Number Suspected: 1; 
Number Exposed: Unknown; 
Facility Type: Private Facility; 
Comments: Quarantine has been lifted as of 3/28/25. Two of the six affected horses are deceased, but not likely to be related to EHV virus. The remaining affected horses have fully recovered.; 
Previous Alerts: 4317, 4251, 4249