Thank you Wanda Smith for forwarding, and Sandy Kriegsman for supplying this important EHV-1 official update, “straight from the horses mouth”. Our thoughts and best wishes are with you and the horses at Sanbar in this very scary and traumatic time.
The following is an update from Sandy about the situation at Sanbar:
· On August 23rd, 2 horses spiked a fever in the upper barn. This was the barn to which the originally infected horse had been moved for isolation for 11 hours on Friday the 19th.
· Nasal swabs done on these two showed that one of the horses had a high viral load, the other only a low ‘environmental’ load. .
· The two are being kept isolated and treated with anti-viral medicine.
· Neither of the two show any neurological signs nor any overt sign of the disease other than the original fever and the positive nasal swab result.
· The horse that had originally gone to Davis was not put down but passed away at Davis on the morning of the 24th.
· The California Dept. of Food & Agricultural, Animal Health Branch Chief, Dr. Kent Fowler and Equine Program Lead, Dr. Katie Flynn, both from Sacramento, came to Sanbar on the 24th to view our site, and make recommendations concerning our bio-security practices and quarantine.
· All recommendations were put into place and the horses and premises quarantined. Quarantine release is determined on a case-by-case basis, but if no further cases appear, Sanbar will likely be released from quarantine around the 10th of Sept.
• Dr. Nicola Pusterla, Associate Professor in the Equine Infectious Disease Research Lab at the UC Davis Veterinary School requested that nasal swabs be obtained from all horses at Sanbar. That was done and all but one of the 2 horses that had spiked a fever, showed negative or low ‘environmental’ viral load.
· This virus is ubiquitous in the environment and a significant percentage of the general horse population can show a low ‘environmental’ load of the virus. Until compatible clinical signs, especially a fever, and a positive nasal swab are identified, the horse is not considered to be an infected EHV-1 horse.
· All barns have been thoroughly disinfected as requested.
· We will continue to take temperatures of all horses twice a day until the official quarantine ends.
· We will continue all the bio-security measures until the official quarantine ends.
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.