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Disease Outbreak Alerts

Updates on current disease outbreaks are listed here as they occur and will include the date listed, disease name, location and current status. Specific premises will not be named but the general location by town, county and state will be listed. When locations, events or horses are at risk they will be listed. Updates will be posted as they are received.


November 21, 2016
Equine Herpes Viruses
Los Angeles County, CA
Outbreak Update
There were no new febrile horses or confirmed clinical EHV-1 horses today at the Los Angeles Equine Center (LAEC). Quarantined isolation is now home to ten (10) horses and all ten (10) are now PCR test negative on nasal swab and blood testing. Enhanced biosecurity measures are in place in all barns under quarantine and all horses’ temperatures continue to be monitored twice daily. CDFA and staff continue to provide oversight in working closely with management, trainers and owners at LAEC. The updates on this EHV-1 incident will continue on a 48-hour basis. December 2, 2016 is the potential quarantine release date assuming no new EHV-1 cases and adherence to the terms of the quarantine (no movement off-site from LAEC quarantined barns and twice a day temperature monitoring of all horses under quarantine).
November 21, 2016
Equine Herpes Viruses
Los Angeles County, CA
Outbreak Update
On November 20, 2016 there were no new febrile horses or confirmed clinical EHV-1 horses at the Los Angeles Equestrian Center. Quarantined isolation is now home to ten (10) horses as one of the eleven (11) in quarantined isolation from yesterday qualified to move back to home quarantined stall based on two weeks of negative EHV-1 nasal swab and blood testing. One of the ten (10) remaining horses in isolation continues to PCR test positive on nasal swab and the other ten (10) are now PCR test negative on nasal swab and blood testing. Enhanced biosecurity measures are in place in all barns under quarantine and all horses’ temperatures continue to be monitored twice daily. CDFA and USDA staff continue to provide oversight in working closely with management, trainers and owners at Los Angeles Equestrian Center.
November 15, 2016
Equine Herpes Viruses
Los Angeles County, CA
Outbreak Update
There were no new clinical EHV-1 horses moved to quarantined isolation today at the LAEC. Currently, quarantined isolation is home to twelve (12) horses. To date, there have been seven confirmed cases of Equine Herpesvirus-1 Myeloencephalopthy (EHM), one of which was euthanized due to the severity of the disease. The six neurologic cases and four confirmed EHV-1 positive horses continue to show improvement and remain in isolation. In addition, two febrile horses in isolation have twice tested negative and will continue to be monitored in isolation. Enhanced biosecurity measures are in place in all barns under quarantine and all horses’ temperatures are monitored twice daily. CDFA veterinarians, livestock inspectors and USDA animal health technicians continue to monitor the quarantine and incident situation on-site and will provide additional updates as they become available.
November 14, 2016
Equine Herpes Viruses
Los Angeles County, CA
Outbreak Update
On November 14, 2016 one horse at the Los Angeles Equestrian Center (LAEC), displaying a fever yesterday and placed in quarantined isolation, has been confirmed positive for non-neuropathogenic EHV-1 today. Additionally, the two febrile horses which tested negative on November 10, 2016, were re-sampled yesterday and testing confirmed negative status. Currently, quarantined isolation is home to twelve (12) horses. To date, there have been seven confirmed cases of Equine Herpesvirus-1 Myeloencephalopthy (EHM), one of which was euthanized due to the severity of the disease. The remaining six neurologic cases are showing improvement and remain in isolation. Enhanced biosecurity measures are in place in all barns under quarantine and all horses’ temperatures are monitored twice daily. CDFA veterinarians, livestock inspectors and USDA animal health technicians continue to monitor the quarantine and incident situation on-site and will provide additional updates as they become available.
November 14, 2016
Equine Herpes Viruses
Los Angeles County, CA
Confirmed case(s): Official Quarantine
On November 13, 2016, one horse at the Los Angeles Equestrian Center (LAEC), displaying a fever was placed in isolation quarantine and samples were collected for testing at the California Animal Health and Food Safety Laboratory. Additionally, the two febrile horses which tested negative on November 10, 2016, were re-sampled to confirm negative status. To date, there have been six confirmed cases of Equine Herpesvirus-1 Myeloencephalopthy (EHM), and three febrile horses confirmed positive Equine Herpesvirus-1. One of the EHM cases was euthanized due to the severity of the disease. The remaining five neurologic cases are showing improvements and remain in isolation. Enhanced biosecurity measures are in place in all barns under quarantine and all horses’ temperatures are monitored twice daily. CDFA veterinarians, livestock inspectors and USDA animal health technicians continue to monitor the quarantine and incident situation on-site and will provide additional updates as they become available.
November 14, 2016
Eastern Equine Encephalitis
Marion County, FL
Confirmed Case(s): No Quarantine
On November 10, a new EEE case was confirmed in Marion County, Florida. The 15 year old paint mare was vaccinated years prior but had not been vaccinated recently and had no recent travel history. Clinical signs began on October 28 and the mare is currently recovering. This is the second confirmed EEE case in Marion County and case 23 in Florida for 2016.
November 13, 2016
Equine Herpes Viruses
Los Angeles Equestrian Center, CA
Confirmed case(s): Official Quarantine
No horses at the Los Angeles Equestrian Center (LAEC), displayed fevers or compatible clinical signs on November 11, 2016 and November 12, 2016. The two febrile horses added to isolation quarantine on November 10, 2016 tested negative on nasal swab and blood for Equine Herpesvirus -1. Samples will be collected from both horses in 72 hours to confirm negative status. One of these two febrile horses was from an LAEC barn that was not under quarantine. Out of an abundance of caution, the quarantine was expanded to include barn of origin for the febrile horse. Enhanced biosecurity measures are in place in all barns under quarantine and all horses’ temperatures are monitored twice daily. Eleven horses currently reside in quarantined isolation – five of these horses have been confirmed with neurologic symptoms (EHM cases). All confirmed positive horses remain in quarantined isolation and continue to stabilize and show improvement. The LAEC horses that attended the horse show in Las Vegas most likely contracted EHV-1 on their return to the LAEC, following a short incubation period. CDFA veterinarians, livestock inspectors and USDA animal health technicians continue to monitor the quarantine and incident situation on-site and will provide additional updates as they become available.
November 12, 2016
West Nile Virus
Powell County, KY
Confirmed Case(s): No Quarantine
The University of Kentucky’s Veterinary Diagnostic Laboratory, confirmed a diagnosis of West Nile virus affecting a 12-year old Palomino gelding in Powell County, KY. On 11/4/2016 the horse was lethargic and febrile and had a poor appetite. The horse, the 7th in Kentucky in 2016, had no history of West Nile virus vaccination and is recovering. Go To: http://www.kyagr.com/statevet/equine-infectious-diseases.html for more information.
November 10, 2016
West Nile Virus
Ventura County, CA
Confirmed Case(s): No Quarantine
On November 10, 2016, an unvaccinated 17-year old Arabian mare in Ventura County, displaying neurologic signs was confirmed positive for West Nile Virus (WNV). The mare is recovering. A total of twenty one (21) horses have been confirmed positive for WNV and are located in the following counties; Calaveras, Fresno(2), Merced, Riverside, Sacramento(3), San Diego, San Joaquin(7), Shasta, Sutter(2) and Ventura(2) counties. Eighteen of the positive horses were not current on their WNV vaccinations and two horses had unknown vaccination status. Seven of the twenty one positive confirmed horses died or were euthanized. CDFA continually monitors and investigates equine neurologic cases for the presence of WNV in California. CDFA urges horse owners to consult their veterinarian concerning a WNV vaccination program to ensure maximum protection of their horses. For additional information visit : https://www.cdfa.ca.gov/ahfss/animal_health/WNV_Info.html
November 10, 2016
Equine Herpes Viruses
California, United States
Outbreak Update
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. CDFA Animal Health Branch veterinarians continue to monitor the quarantine and situation on-site and will provide additional updates as they become available. Go to: https://www.cdfa.ca.gov/ahfss/animal_health/equine_herpes_virus.html