Source:  News Release

California EHV-1 Causing EHM Disease Update as of 1 pm 5/31/2011 

California has no new confirmed case of Equine Herpes Myeloencephalopathy (EHM) caused by EHV-1. There are 19 confirmed EHV-1/ EHM cases in the state.

• The suspect case reported on 5/28 with low grade fever and moderate compatible neurologic signs has not yet been confirmed positive. The horse did not participate in Ogden, UT or Bakersfield CA events. The horse was exposed at home premises to one of the California confirmed EHM positive horses which participated in the Ogden, UT event.
• The positive confirmed cases are located in the following 13 counties: Amador(1), Colusa(1), Glenn(2), Kern(2), Los Angeles(1), Marin(1), Napa(1), Placer (3), Plumas(1), Sacramento (1), Shasta(1), Stanislaus(3) and Ventura(1).
• Sixteen(16) of the confirmed positive EHV-1/EHM CA cases participated in the National Cutting Horse Association’s Western National Championships in Ogden, Utah.
• Two (2) of the confirmed positive EHV-1/ EHM CA cases participated only in the Kern County Cutting Horse Event on May 13th in Bakersfield, CA.
• One (1) of the confirmed positive  EHV-1/EHM CA cases was an exposed horse to an Ogden, UT participant.
• One confirmed positive EHM horse was euthanized after showing severe neurological signs associated with EHM.
• All positive confirmed EHV-1/EHM cases are under a State Quarantine.