EHV-1 Update: California

Published on July 18, 2017

The Pilchuck Veterinary Hospital equine department strives to keep our clients and the equine community updated on veterinary alerts, such as those related to EHV-1. Here's the latest EHV-1 update from the California Department of Food and Agriculture: 

March 25, 2013: A Welsh Cross gelding in Santa Barbara County displaying neurologic signs on March 20, 2013 has been confirmed positive for the non-neuropathogenic strain of Equine Herpesvirus -1 (EHV-1). This strain of virus is responsible for the more common respiratory EHV-1 cases. A small percentage of non-neuropathogenic EHV-1 infected horses can display neurologic signs and are classified as equine herpes myeloencephalopathy cases which are a reportable condition in California. 

CDFA’s epidemiologic investigation indicates the Welsh Cross gelding and the Warmblood stallion both participated in the HITS event in Thermal, CA. The Welsh Cross gelding departed Permanent Barn 2 on March 10th and the Warmblood stallion departed Tent 29 on March 15th. Both confirmed positive horses have been quarantined and are under veterinary care. Potentially exposed horses to EHV-1 are recommended to be isolated and temperatures monitored twice daily for 14 days post potential exposure date.

Additional information is available on the CDFA website at

Basic equine biosecurity precautions