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Equine Herpes Myeloencephalopathy (EHV) Incident in CA, New UPDATE! Nov. 10th, 2016

November 10th, 2016

At the Los Angeles Equestrian Center, two additional horses were moved to quarantined isolation—one due to elevated temperature with pending EHV-1 test results and the other with elevated temperature and confirmed positive for non-neuropathogenic EHV-1 nasal swab. Nine horses currently reside in quarantined isolation.
The three barns remain under quarantine with enhanced biosecurity and horses’ temperatures are monitored twice daily.
Since issuance of the quarantine on November 3, 2016 a total of six horses displaying neurologic signs have been confirmed positive for Equine Herpesvirus Myelencephalopathy. One of the six horses was euthanized on November 3rd due to the severity of clinical signs. All other confirmed positive horses remain in quarantined isolation and continue to stabilize and show improvement. Four of the six confirmed positive horses participated in a horseshow in Las Vegas, NV on October 24, -29, 2016. At this time, no additional EHV-1 cases have been confirmed in horses that exhibited at the Las Vegas horse show. CDFA has confirmed that the host facility has taken biosecurity measures of thorough cleaning and disinfection of the show facility.

CDFA Animal Health Branch veterinarians continue to monitor the quarantine and situation on-site and will provide additional updates as they become available.

November 7, 2016
At the Los Angeles Equestrian Center, a febrile horse displaying mild neurologic signs has been confirmed positive for the non-neuropathogenic strain of Equine Herpesvirus-1. Since issuance of the quarantine on November 3, 2016 a total of six horses displaying neurologic signs have been confirmed positive for Equine Herpesvirus Myelencephalopathy. One of the six horses was euthanized on November 3rd due to the severity of clinical signs. All other confirmed positive horses remain in isolation and under quarantine. All exposed horses remain under quarantine and temperatures are being taken twice daily. Four of the six confirmed positive horses participated in a horseshow in Las Vegas, NV on October 24, -29, 2016. At this time, no additional EHV-1 cases have been confirmed in horses that exhibited at the Las Vegas horse show. CDFA has confirmed that the host facility has taken biosecurity measures of thorough cleaning and disinfection of the show facility.

CDFA Animal Health Branch veterinarians continue to monitor the quarantine and situation on-site and will provide additional updates as they become available.

November 4, 2016
On November 4, 2016, three additional horses were confirmed positive for the non-neuropathogenic strain of Equine Herpesvirus-1 on the Los Angeles County index premises. Two of the three affected horses display neurologic signs and the third horse is febrile and all three are in isolation. Two of these newly confirmed equine cases attended the Las Vegas horse show last week. At this time, no additional EHV-1 cases have been confirmed in horses that exhibited at the Las Vegas horse show on October 27 – 29, 2016. Exposed horses on the Los Angeles index premises continue to have their temperatures monitored twice daily and enhanced biosecurity measures remain in place. CDFA Animal Health Branch veterinarians continue to monitor the quarantine and situation on-site and will provide additional updates as they become available.

November 3, 2016
On November 3, 2016, a 5 year-old Saddlebred displaying severe neurologic signs and a 10 year-old Saddlebred in Los Angeles County displaying moderate neurologic signs were confirmed positive for the non-neuropathogenic strain Equine Herpesvirus-1 at the California Animal Health and Food Safety Laboratory. Due to severity of clinical signs, the 5 year-old horse was euthanized on November 3, 2016. The Department has issued a quarantine for exposed horses at the facility and has implemented enhanced biosecurity measures. All exposed horses will have temperatures taken twice daily and be observed for clinical signs compatible with EHV.

The two confirmed positive horses, along with six other horses, recently returned from a horse show in Las Vegas, NV from Oct. 27-29, 2016. These horses returned to the California home premises on October 30. Out of an abundance of caution, show management has notified trainers/owners participating in the event to recommend twice daily temperature monitoring and observation of compatible clinical signs.

CDFA Animal Health Branch veterinarians are onsite monitoring the situation and will provide additional updates as they become available.