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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 07, 2016 Equine Herpes Viruses Los Angeles , CA Outbreak Update
There have been no new febrile horses identified on this premises and only EHM one horse remains in isolation. The positive horse in isolation continues to shed virus and we are anticipating a negative nasal swab soon. The LAEC incident has had a total of thirteen (13) EHV-1 confirmed cases, all of those caused by the non-neuropathogenic strain EHV-1 virus. Enhanced biosecurity measures continues in all barns under quarantine and all horses’ temperatures continue to be monitored twice daily.
December 05, 2016 Equine Herpes Viruses Inyo County, CA Outbreak Update
A different strain of EHV-1 causing EHM has been confirmed in one horse with mild neurologic symptoms in Inyo County, CA.  Although no additional EHM cases have been confirmed on this premises, we are still awaiting confirmatory testing on two febrile horses that have been isolated.  This is the neurologic strain, which is biologically distinct from the non-neurologic strain identified in all the LA County confirmed cases.  The affected horse, a 20 year-old QH gelding, is part of a wintering pack string of twenty-eight (28) horses and four (4) 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.
December 05, 2016 Equine Herpes Viruses Los Angeles County, CA Outbreak Update
There have been no new febrile horses identified on this premises and only one horse remains in isolation. The LAEC incident has had a total of thirteen (13) EHV-1 confirmed cases, all of those caused by the non-neuropathogenic strain EHV-1 virus. Enhanced biosecurity measures continues in all barns under quarantine and all horses’ temperatures continue to be monitored twice daily.
December 04, 2016 Equine Herpes Viruses Inyo County, CA Confirmed case(s): Quarantine
A different strain of EHV-1 causing EHM has been confirmed in one horse with mild neurologic symptoms in Inyo County, CA. Although no additional EHM cases have been confirmed on this premises, two febrile horses have been isolated and are awaiting confirmatory testing. This is the neurologic strain, which is biologically distinct from the non-neurologic strain identified in all the Las Angeles County confirmed cases. The affected horse, a 20 year-old QH gelding, is part of a wintering pack string of twenty-eight (28) horses and four (4) 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.
December 04, 2016 Equine Herpes Viruses Los Angeles, CA Outbreak Update
There have been no new febrile horses identified on the LAEC premises and only one horse remains in isolation. The LAEC incident has had a total of thirteen (13) EHV-1 confirmed cases, all of those caused by the non-neuropathogenic strain EHV-1 virus. Enhanced biosecurity measures continues in all barns under quarantine and all horses’ temperatures continue to be monitored twice daily.
December 02, 2016 Equine Herpes Viruses Inyo County, CA Confirmed case(s): Quarantine
December 2, 2016: One horse with mild neurologic symptoms has been confirmed as a case of EHM in Inyo County, California. This case is caused by the neurologic EHV-1 strain and is biologically distinct from the non-neurologic strain identified in all the recently confirmed cases (13 cases) in Los Angeles County. The affected horse, a 20-year-old QH gelding, is part of a wintering pack string of twenty-eight (28) horses and four (4) 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. This disease outbreak is under investigation by CDFA staff onsite and CDFA will continue to provide updated information. For more information go to: https://www.cdfa.ca.gov/ahfss/animal_health/equine_herpes_virus.html.
December 02, 2016 Equine Herpes Viruses Los Angeles County, CA Outbreak Update
December 2, 2016-Los Angeles County EHM outbreak update: The Los Angeles Equestrian Center EHM outbreak has had a total of thirteen (13) EHV-1 confirmed cases and all of those caused by the non-neuropathogenic strain EHV-1 virus. There has been no new febrile horses since November 23rd and only one positive horse remains in isolation. Enhanced biosecurity measures continue in all barns under quarantine and all horses’ temperatures continue to be monitored twice daily
December 02, 2016 West Nile Virus McCurtain County, OK Confirmed Case(s): No Quarantine
The 15th reported WNV positive horse has been confirmed for 2016 in Oklahoma. The yearling QH filly located in McCurtain County was showing severe neurologic signs and was euthanized. Vaccination status is unknown. For more information visit: http://www.ag.ok.gov
December 01, 2016 Equine Herpes Viruses Los Angeles County, CA Outbreak Update
As of December 1st, 2016 one (1) horse remains in quarantined isolation –this horse remains positive for EHV-1 on PCR nasal swab diagnostic testing on November 30th. No febrile horses were identified today at LAEC in the quarantined barns. Enhanced biosecurity measures are in place in all barns under quarantine and all horses’ temperatures continue to be monitored twice daily. CDFA 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. The quarantine release date will be evaluated based on additional test results from the positive horse in isolation at LAEC.
November 29, 2016 Equine Herpes Viruses Los Angeles County, CA Outbreak Update
A febrile horse from one of the quarantined barns in the Los Angeles Equestrian Center was moved to isolation last Wednesday evening, November 23, 2016. Initial nasal swab was negative on diagnostic testing at CAHFS laboratory and the horse was retested on November 26th and found to be PCR positive for EHV-1 on nasal swab. Seven (7) horses in isolation were moved to home stalls today based on repeated negative EHV-1 testing. Quarantined isolation is now home to two (2) horses and one of the two has qualified with negative EHV-1 testing to be moved to home stall tomorrow. Enhanced biosecurity measures are in place in all barns under quarantine and all horses’ temperatures continue to be monitored twice daily. CDFA 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. The quarantine release date will be evaluated based on additional test results from the recent positive horse in isolation at LAEC.