Source:  CDFA

CALIFORNIA EHV-1 CAUSING EHM DISEASE UPDATE AS OF 12 PM 5/25/2011

California has no new confirmed cases of Equine Herpes Myeloencephalopathy (EHM) caused by EHV-1 since our May 23rd update. There continues to be 18 confirmed EHM cases in the state.

The positive confirmed cases are located in the following 12 counties: Amador(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 EHM CA cases participated in the National Cutting Horse Association’s Western National Championships in Ogden, Utah.
Two (2) of the confirmed positive EHM CA cases participated only in the Kern County Cutting Horse Event on May 13th in Bakersfield, CA.
One confirmed positive EHM horse was euthanized after showing severe neurological signs associated with EHM.
All positive confirmed EHM cases are under a State Quarantine.
California Department of Food and Agriculture is working with animal Health officials in the western states to monitor the disease outbreak and investigate the source of the disease outbreak.

Disease reports in California continue to be limited to horses exhibited at the National Cutting Horse Association’s Western National Championships (NCHA) held at the Golden Spike Event Center in Ogden, Utah from April 30th to May 8, 2011 and the Kern County Cutting Event in Bakersfield, CA on May 13, 2011. CDFA has quarantined all infected horses and continues to advise that horses returning from those events and horses that have subsequently come into contact with returning horses avoid moving from their home premises until California has gone 14 days without a new case of EHM.