Sunday, February 5, 2023

Officials Recommend Postponing Non-Essential Horse Movement This Month as Equine Herpes Outbreak Hits California


The following is a letter from the California Department of Food and Agriculture Equestrian Event Coordinators and Participants:

Barrel racing at Boonville’s Apple Fair [Picture by Matt LaFever]

Dear Equine Event Coordinators and Participants:

Equine herpesvirus myeloencephalopathy (EHM) has been detected in multiple horses in several counties in California. If not controlled, it can have significant consequences to the horse industry, infecting thousands of horses due to the extensive mixing of horses at statewide, national, and international horse events.

Equine herpesvirus causes respiratory disease, abortion, neonatal death, and the neurological disease known as EHM. It spreads in aerosolized secretions, by direct contact, and by contact with surfaces containing infected secretions. Shedding of the virus generally occurs for 7-10 days.

To reduce disease spread, the California State Veterinarian recommends that all hunter/jumper events (the most affected group) be postponed for the next 28 days, all equine events be postponed for the next 14 days, and all non-essential horse movements postponed for at least 14 days.

Horse owners must immediately isolate any horses exhibiting neurologic signs and consult their veterinarian; EHM has mandatory State reporting requirements. Owners must practice good biosecurity when they move horses in emergency situations or for veterinary care; avoid other horses and don’t share tack/equipment that hasn’t been properly cleaned and disinfected, including farrier and veterinary equipment.

For more information visit

This recommendation considers an event when horses from different home premises are brought together at a single location and include, but are not limited to: competitions of any discipline (in state or out of state), rodeos, educational riding clinics, and any travel of horses to an outside facility for lessons or casual/social gathering, etc. Sanctioned horse
racing tracks are exempt from this recommendation.




Join the Conversation

MendoFever Staff
MendoFever Staff
Editor's Note: Whenever an article's byline reads "MendoFever Staff", the contents of that article were not composed by any of our reporters. Types of writing that will be attributed to "MendoFever Staff" include press releases, letters to the editor, op-eds, obituaries— essentially writing that is not produced by a reporter.

Today's News


News from the Week

%d bloggers like this: