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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
January 12, 2017 Equine Herpes Viruses Oldham County, KY Outbreak Update
Results of testing for the EHV-1 outbreak initially reported on 1/7/17 in Oldham County identified two additional horses positive for EHV-1. In addition, the horse that had spiked a fever late last week, tested positive to the same virus type (neuropathogenic strain). All three of these horses were moved from their stabling area and placed in the isolation unit and none of remaining horses in the barn were positive for EHV-1. Subsequently, the horse that had fever presented with neurological abnormalities on Monday and was moved to isolation at a veterinary hospital for treatment where it continues to improve. All horses that had left the facility have been located and testing completed. Two horses that had moved were identified as positive. These horses are in isolation on private facilities and are being monitored with the established protocol.
January 12, 2017 Equine Herpes Viruses Oldham County, KY Confirmed case(s): Quarantine
After developing a fever on 1/9/2017, one horse residing on a premises different from the original premises in Oldham County tested positive for EHV1 (wild type). There have been no neurologic abnormalities seen. The affected horse on this new premises was moved to an isolation barn when fever was detected and plans are in place to remove him from the premises tomorrow. The barn where this horse resided was placed under order of quarantine by the Kentucky Department of Agriculture (KDA). All the horses’ temperatures in all barns on the premises are being monitored and recorded daily. KDA has and will continue to have personnel on the grounds monitoring activity. Samples (nasal swabs and whole blood) were collected from each horse residing in the affected barn and those samples were submitted to the laboratory for EHV-1 testing. Although this is the second premises currently under quarantine are in Oldham County, different strains of the virus are involved. There is no evidence that this case is related to the initial outbreak reported on 1/7/17.
January 10, 2017 Equine Herpes Viruses Los Angeles Equestrian Center, CA Outbreak Update
As of January 10, 2017 there are no new cases of Equine Herpesvirus Myeloencephalopathy (EHM) at the Los Angeles Equestrian Center. One horse remains in quarantined isolation awaiting prescribed negative testing. For background information go to: https://www.cdfa.ca.gov/ahfss/animal_health/equine_herpes_virus.html
January 10, 2017 Equine Herpes Viruses Los Angeles County, CA Confirmed case(s): Quarantine
A case of Equine Herpesvirus Myeloencephalopathy (EHM) has been confirmed on a new Los Angeles County premises. A 12-year-old Quarter Horse mare displaying severe neurologic signs has been confirmed positive for the wild type (non-neuropathogenic) Equine Herpesvirus-1 in the nasal swab and blood. Due to the severity of clinical signs the horse was euthanized. This horse has been classified as a case of EHM which requires regulatory action. The premises of 56 exposed horses in Los Angeles County has been placed under quarantine and all horses are being monitored for clinical signs with twice daily temperature monitoring. One additional 32 year-old horse on the property displaying a fever tested positive today for the wild type of EHV-1 in the nasal swab and blood. This horse has been placed in isolation on site. CDFA staff onsite have implemented enhanced biosecurity measures and has begun the epidemiologic investigation. For more information go to: https://www.cdfa.ca.gov/ahfss/animal_health/equine_herpes_virus.html
January 09, 2017 Equine Herpes Viruses New Orleans, LA Outbreak Update
On Wednesday, January 4, 2017, two horses already under quarantine in barn #36 at the Fair Grounds racetrack developed fevers of 104 and 102.1 and were tested PCR negative for EHV-1 in both blood and nasal samples. On Saturday, January 7, 2017, both horses were retested by PCR and are again negative for blood but are now positive for the EVH-1 non-neuropathogenic strain (wild type) on nasal swabs. These two horses were placed in isolation. On Friday, January 6, 2017, a horse in barn #4 spiked a fever of 103.6 and tested PCR negative on Saturday January 7, 2017 for EHV-1 on both blood and nasal samples. Another horse already under quarantine in barn #47 spiked a fever of 102.9 and it also tested PCR negative on Saturday for EHV-1 on all samples. Both horses will be retested in 72 hours. To date 7 horses have tested positive for EHV-1 at the Fair Grounds racetrack, 2 positive for the neuropathogenic strain and 5 positive for the non-neuropathogenic (wild type). The index case diagnosed with neuropathogenic EHV-1 was euthanized and the other 6 cases are in isolation. Four barns are currently under quarantine. A horse that was exposed to the positive horse in the receiving barn was traced to a livestock dealer in Pitkin, LA. That horse is now in quarantine isolation at the facility and an investigation into exposed horses is on-going. The horse reportedly has been purchased and efforts are being made to place the horse in private quarantine for monitoring and testing in so the horse to be moved to its new home out of state. Louisiana Department of Agriculture & Forestry, USDA, and Racing Commission veterinarians continue to work with track personnel in monitoring the incident at the Fair Grounds.
January 09, 2017 Strangles Marion County, FL Confirmed case(s): Quarantine
On January 6, one premise in Marion County, Florida was placed under quarantine for strangles after PCR results returned positive. Clinical signs began January 2 and no equids have left the facility since clinical signs began. This is the first case for Marion County and Florida in 2017.
January 07, 2017 Equine Herpes Viruses Oldham County, KY Confirmed case(s): Quarantine
On 1/4/17, a 2-year old filly was referred from a Northern KY equine facility (Oldham Co) to a Lexington area hospital for evaluation of a potential neurologic disease. The examining veterinarian noticed evidence of urine dripping, suspected an infectious disease, and reported the concern to the Kentucky Department of Agriculture (KDA). The filly was isolated and samples were collected which were confirmed positive for the neuropathogenic strain of EHV-1 that same evening. The facility was quarantined by KDA personnel. On 1/5/17, horses (14) in the ‘affected’ wing of the barn were sampled by nasal swab and whole blood as were 3 horses in the second wing that had been preparing to ship interstate. These samples were received at Equine Diagnostic Solutions Lexington laboratory on Thursday night 1/5/2017. On the morning of 1/6/2017 a horse in the second wing spiked a fever >103 degrees. Nasal swabs and whole blood were collected. The laboratory reported 2 of the 14 horses on Side 1 and the febrile horse on Side 2 were also positive for the neuropathogenic EHV-1. The remaining horses on the premises were sampled with results expected sometime on Monday. All equine moved from the facility since mid-December have been traced, located and are being individually assessed and tested following KDA defined protocol. There has been no movement to any KY racing/training facility. Two horses that had left the facility in late December and traveled to a track outside of Kentucky have been located are now isolated, and samples have been collected and submitted for EHV-1 testing. On 1/7/2017, the initial horse has been reported as improved, and is preparing to be discharged from the hospital and moved to a private facility where it will remain in isolation. The positive horses from the index facility have been moved to a designated isolation area. The horses on the facility continue to be monitored closely, temperatures taken multiple times during the day, and any horse presenting evidence of illness suggestive of a viral infection (including fever) will be isolated and tested. There have been no fevers or other abnormalities reported on 1/7/2017. Management at the facility is cooperating fully and is committed to containing and effectively managing the disease. Updates will be provided when warranted.
January 07, 2017 Equine Herpes Viruses Los Angeles , CA Outbreak Update
There are no new EHM cases at the Los Angeles Equestrian Center as of January 6, 2017. LAEC continues to have one horse in quarantined Isolation awaiting prescribed negative testing.
January 06, 2017 Strangles Clarence, NY Information Only
On Jan 3, 2017, a premises in Clarence, NY, was visited by a state official after reports of strangles on the property. The official met with barn management, the private veterinarian and some visitors at the barn to review biosecurity practices and educate riders about strangles. The state will continue to monitor the situation.
January 05, 2017 Equine Herpes Viruses Los Angeles County, CA Outbreak Update
To the best of the State Veterinarian’s office knowledge, there are currently no horses on the Los Angeles Equestrian Center premises shedding EHV-1 virus”. Through repeated negative testing, one of the horses in isolation has been released to home stall. The remaining horse in isolation will be retested January 5th and a negative test result on Jan. 6th will allow this horse to return to its home stall and release of isolation barn quarantine. The last febrile case occurred on December 12, 2016.