A Welsh-cross gelding in Santa Barbara County in California has been confirmed positive for the non-neuropathogenic strain of Equine Herpesvirus-1 (EHV-1).
The California Department of Food and Agriculture said on Monday that the animal was displaying neurologic signs on March 20.
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.
The department confirmed on March 19 that a Warmblood stallion in San Diego County displaying mild neurologic signs had been confirmed positive for the non-neuropathogenic strain of EHV-1.
The department’s investigation indicates the two horses both participated in the HITS event in Thermal, California.
The Welsh-cross gelding departed Permanent Barn 2 on March 10 and the Warmblood stallion departed Tent 29 on March 15.
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.