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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.


Date Disease Location Status
November 14, 2016 Equine Herpes Viruses Los Angeles County, CA Confirmed case(s): 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): 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
November 09, 2016 Equine Herpes Viruses Broward County, FL Confirmed Case(s): No Quarantine
On November 8, one premises in Broward County was placed under quarantine after a horse displayed neurologic signs and was confirmed positive for EHV-1 wild type strain via PCR. Currently, no other horses at the premises have presented with clinical signs consistent with EHV-1. The index case died of natural causes late November 6 and started displaying neurologic signs the same day. All horses on the premises are required to have their temperatures taken twice daily with any temperatures above 101.5 reported to incident management and tested for EHV. Additional biosecurity measures are in place. The Florida Department of Agriculture and Consumer Services will continue to monitor the situation and provide updates as warranted. For additional information please click http://www.freshfromflorida.com/Divisions-Offices/Animal-Industry and look under announcements near the bottom center of the page.
November 09, 2016 Equine Herpes Viruses Los Angeles County, CA Confirmed Case(s): No Quarantine
At the Los Angeles Equestrian Center, a horse that had been placed in the quarantined isolation area of the facility on Nov. 3rd due to an elevated temperature and initially tested negative on both nasal swab and blood for EHV-1, has subsequently tested positive on both nasal swab and blood for non-neuropathic EHV-1. Since this horse was originally moved to isolation from a barn on the facility that had not previously been identified with a confirmed EHV-1 case, the horse population under quarantine at LAEC was expanded to a total of three barns under quarantine. All horses under quarantine are required to have their temperatures taken 2X/day and any elevated temperatures reported to incident management. In addition, all horses in these barns are under enhanced and strict biosecurity protocols. 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 are stable and responding to treatment. 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 08, 2016 West Nile Virus Gibson, Dyer, and Chester Counties, TN Confirmed Case(s): No Quarantine
The Tennessee Department of Agriculture has recently reported two new cases of WNV, one in Gibson County and one in Dyer County, and a case of EEE in Chester County. The vaccination status of the horses and the outcomes of the cases are unknown. For more information go to: http://www.tn.gov/agriculture/news/46602
November 08, 2016 Equine Herpes Viruses Los Angeles County, CA Confirmed case(s): Quarantine
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. For more information go to: https://www.cdfa.ca.gov/ahfss/animal_health/equine_herpes_virus.html.