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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.



Maricopa County, AZ
Outbreak Identifier: 7215
Type: EHV-1
Alert ID: 4741
November 22, 2025
Exposed Horses - Official Quarantine

Arizona Department of Agriculture

Number Confirmed: 1; 
Number Exposed: 3; 
Facility Type: Private Facility; 
Comments: Horse is nasal swab PCR positive for EHV-1 D752 but clinically normal, not febrile, no neurologic signs. This case is associated with the EHM outbreak that originated at the Women’s Professional Rodeo Association (WPRA) World Finals and Elite Barrel Race event. For an up-to-date count of EHM cases tied to this outbreak, please visit: HERE