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August 25, 2011: No new EHV-1 cases.
August 24, 2011: Two additional EHV-1 cases confirmed
Two (2) additional horses on the affected premises have been confirmed positive by nasal swab for the neuropathogenic strain of EHV-1. The only clinical sign displayed by these two horses was a fever. The affected premises is under quarantine and the thirteen (13) other horses currently on the property are being monitored. Current epidemiologic investigation findings indicate minimal risk of disease spread from this closed premises.
August 23, 2011: Confirmed case of EHV-1 neurotropathogenic strain
On August 23, 2011, a 15 year old Oldenburg mare from Sonoma County has confirmed positive for the neuropathogenic strain of Equine Herpes Virus-1. The mare is isolated, quarantined and undergoing treatment at a veterinary referral hospital. The premises of origin is under veterinary observation and the potentially exposed horses temperatures are being monitored twice daily. Epidemiologic investigation conducted by CDFA reveals minimal disease risk based on lack of animal movement on and off the affected premises. The investigation has determined the positive horse has no direct link to the May 2011 outbreak of EHV-1 in cutting horses which resulted in 22 positive confirmed equine cases in California. CDFA staff will continue to monitor the situation to ensure disease control.
May 2011 Outbreak
The National Cutting Horse Association (NCHA) Western National Championship held in Ogden, Utah April 30-May 8, 2011 had 400 competitors. On May 13, 2011, California Animal Health Officials were notified by the NCHA that fifty-four (54) California horses that competed in the event may have been exposed to the neuropathogenic strain of the EHV-1 virus. Some of these same horses were entered in the Kern County Cutting Horse event in Bakersfield, CA on May 13, 2011. One horse, that competed in Ogden, UT, was euthanized at the Kern County Cutting Horse event after showing severe neurological signs; EHM was the final diagnosis for this horse. All horses at the Ogden, UT and Bakersfield, CA events were potentially exposed to the disease. A total of 22 California horses were confirmed positive for the neuropathogenic strain of EHV-1. On June 20, 2011, California declared containment of the EHV-1 Outbreak.
Press Release: California Declares Containment of Equine Herpes Virus (EHV-1) Outbreak (6/20/11, PDF)
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Sunday, November 6, 2011 at 8:59PM 
