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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
December 16, 2016 Equine Herpes Viruses Inyo County, CA Outbreak Update
12-15-2016: No additional confirmed cases of EHM, EHV-1 or new febrile horses have been identified at the ranch in Inyo county. This incident has two (2) EHM cases and one EHV-1 confirmed case. Both of the EHM cases continue to show improvement. All three cases have been caused with the neurotrophic strain of the EHV -1. The affected horses are part of a wintering pack string of horses and mules on an isolated, high desert ranch. These horses/mules were placed under quarantine with no movement allowed in order to limit disease transmission. The investigation of this disease outbreak is continuing by CDFA staff. Enhanced biosecurity is in place and we appreciate the cooperation and assistance from owner and private veterinarian. Updates will continue on a 48-hour basis.
December 16, 2016 Equine Herpes Viruses Los Angeles, CA Outbreak Update
12-15-2016: There are currently four (4) horses in quarantined isolation at the Los Angeles Equestrian Center. One horse was able to return to home based on a series of negative tests. Two (2) horses are remaining in isolation as additional negative tests are anticipated. Two (2) horses continue to shed virus and will be resampled for diagnostic EHV-1 testing. None of these four (4) horses are febrile or showing neurologic symptoms at this time. Only horses in C Barn continue to be quarantined. There have been no new febrile horses over the past three (3) days in C Barn. The LAEC incident has had a total of fifteen (15) EHV-1 confirmed cases, all of those caused by the non-neurotrophic strain EHV-1 virus. Enhanced biosecurity measures continue in C Barn under quarantine and all horses’ temperatures continue to be monitored twice daily.
December 15, 2016 Equine Infectious Anemia Wasatch County, UT Confirmed case(s): Quarantine
The Utah Department of Agriculture and Food (UDAF) Animal Industry Division has confirmed the first EIA positive horse in Utah in several years. The 14-year old dark bay QH gelding located in Wasatch County was originally tested for sale and movement to California but was not moved due to a positive EIA test. The horse was immediately quarantined and retested for EIA as well as equine piroplasmosis. The EIA test was again positive but the EP test was negative. The owner has decided to euthanize the horse. This horse was imported from Mexico in April of 2016 with NVSL negative test results for EIA, EP, Glanders, Dourine. Ten other cohort horses that are also quarantined on this ranch have been tested for EIA and results are pending. Twelve other cohort horses that had tested negative to EIA in the spring of this year and sent to Arizona recently are in the process of being identified and located. The State Veterinarian of Arizona has been notified by the Utah State Veterinarian and they are working together to get these horses isolated and retested. UDAF recommends regular EIA testing for all horses, including those that do not leave the property, preferably yearly but at least every 3 years.
December 13, 2016 Equine Herpes Viruses Inyo County, CA Outbreak Update
No additional confirmed cases of EHM, EHV-1 and no new febrile horses have been identified at this time in Inyo county. This incident now has two (2) EHM cases and one EHV-1 confirmed case. Both of the EHM cases continue to show improvement. All three cases have been caused with the neurotrophic strain of the EHV -1. The affected horses are part of a wintering pack string of horses and mules on an isolated, high desert ranch. These horses/mules have been placed under quarantine with no movement allowed in order to limit disease transmission. The investigation of this disease outbreak is continuing by CDFA staff. Enhanced biosecurity is in place and we appreciate the cooperation and assistance from owner and private veterinarian. Updates will continue on a 48 hour basis. For more info go to: https://www.cdfa.ca.gov/ahfss/animal_health/equine_herpes_virus.html
December 13, 2016 Equine Herpes Viruses Los Angeles, CA Outbreak Update
There are currently five (5) horses in quarantined isolation at the Los Angeles Equestrian Center. Three (3) of these horses are remaining in isolation as additional negative tests are anticipated. Two (2) of the horses continue to shed virus and will be resampled for diagnostic EHV-1 testing. None of these five (5) horses are febrile or showing neurologic symptoms at this time. Barns D, E and F have not had a confirmed EHV-1 case and these three barns have been released from quarantine as of 0700 on December 11, 2016. Barns A and B have not had a confirmed case in three (3) weeks and four (4) weeks, respectively, and have been released from quarantine as of 0700 on December 13, 2016. All horses in C Barn continue to be quarantined. The LAEC incident has had a total of fifteen (15) EHV-1 confirmed cases, all of those caused by the non-neurotrophic strain EHV-1 virus. Enhanced biosecurity measures continues in C Barn under quarantine and all horses’ temperatures continue to be monitored twice daily. For more info go to: https://www.cdfa.ca.gov/ahfss/animal_health/equine_herpes_virus.html
December 12, 2016 Equine Herpes Viruses Inyo County, CA Outbreak Update
One of the EHV-1 confirmed positive horses developed severe neurologic symptoms on Saturday and is receiving supportive treatment. No additional confirmed cases of EHV-1 or new febrile horses have been identified at this time. This incident now has two (2) EHM cases and one EHV-1 confirmed case. All three cases have been caused with the neurotrophic strain of the EHV -1. The affected horses are part of a wintering pack string of horses and mules on an isolated, high desert ranch. These horses/mules have been placed under quarantine with no movement allowed in order to limit disease transmission. The investigation of this disease outbreak is continuing by CDFA staff. Enhanced biosecurity is in place and we appreciate the cooperation and assistance from owner and private veterinarian. Updates will continue on a 48 hour basis.
December 12, 2016 Equine Herpes Viruses Los Angeles, CA Confirmed case(s): Quarantine
One new febrile horse was identified in a quarantined barn on December 11th and diagnostic sampling will be forthcoming from CAHFS Laboratory on Monday. Test samples from two horses taken on December 9th indicated one new EHV-1 positive horse in quarantined isolation and the other febrile horse moved to isolation on Friday tested negative for EHV-1. Barns D, E and F have not had a confirmed EHV-1 case and these three barns have been released from quarantine as of 7 AM on December 11, 2016. The Los Angeles Equestrian Center incident has had a total of fourteen (14) EHV-1 confirmed cases, all of those caused by the non-neurotrophic strain EHV-1 virus. Enhanced biosecurity measures continues in all barns under quarantine and all horses’ temperatures continue to be monitored twice daily.
December 10, 2016 Equine Herpes Viruses Inyo County, CA Outbreak Update
No additional confirmed cases of EHV-1 or new febrile horses have been identified at this time. The neurotrophic strain of EHV-1 causing EHM has been confirmed in one horse with mild neurologic symptoms in Inyo County, CA. This horse continues to improve and is now negative to PCR diagnostic testing on nasal swab. Additionally, two (2) febrile horses were confirmed positive for the neurotrophic EHV-1 strain and neither horse is exhibiting any neurologic symptoms. This neurotrophic strain identified in Inyo County is biologically distinct from the non-neurotrophic strain identified in all the Los Angeles County confirmed cases. The affected horses are part of a wintering pack string of horses and mules on an isolated, high desert ranch have been placed under quarantine with no movement allowed in order to limit disease transmission. The investigation of this disease outbreak is continuing by CDFA staff. Enhanced biosecurity is in place and we appreciate the cooperation and assistance from owner and private veterinarian.
December 10, 2016 Equine Herpes Viruses Los Angeles, CA Outbreak Update
There have been two (2) new febrile horses identified in quarantined barns have been moved to isolation at the LAEC. There are now three (3) horses in quarantined isolation. Results from diagnostic PCR testing for EHV-1 on nasal swabs and blood are forthcoming. The LAEC incident has had a total of thirteen (13) EHV-1 confirmed cases, all of those caused by the non-neurotrophic strain the EHV-1 virus. Enhanced biosecurity measures continue in all barns under quarantine and all horses’ temperatures continue to be monitored twice daily.
December 07, 2016 Equine Herpes Viruses Inyo County, CA Outbreak Update
EHM has been confirmed in one horse with mild neurologic symptoms in Inyo County, CA. Additionally, two (2) febrile horses on the same ranch have been confirmed positive for the neurotrophic EHV-1 strain and neither horse is exhibiting any neurologic symptoms at this time. This is the neurologic strain, which is biologically distinct from the non-neurologic strain identified in all the Los Angeles county confirmed cases. The affected horses are part of a wintering pack string of horses and mules on an isolated, high desert ranch. These horses/mules have been placed under quarantine with no movement allowed in order to limit disease transmission. The investigation of this disease outbreak is continuing by CDFA staff. Updates will continue on a 48 hour basis.