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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 27, 2016 Equine Herpes Viruses Fair Grounds Racetrack, New Orleans, LA Confirmed case(s): Quarantine
On Dec 26, 2016 the State Veterinarian’s Office confirmed a positive PCR tests of nasal swabs and blood for the EHV-1 neurotropic strain in a 2-year old Thoroughbred gelding at the New Orleans Fairgrounds Race Track. The horse had been at the Fairgrounds since Dec 4, 2016 and broke with a fever on Dec 20th with no neurological signs. The horse responded to symptomatic treatment until Dec 25th when it developed neurological signs, was subsequently euthanized on the 26th and taken to the LSU school of veterinary medicine for necropsy. The horse was confined to its stall in Barn #14 since Dec 20th and had no direct contact with any other horses, but Barn 14, which houses 46 other horses, is currently under quarantine by the LA State Veterinarian’s Office. Horses will be monitored and have temperatures twice daily with increased biosecurity on the premises. An investigation with the State Racing Commission is currently under way.  
December 27, 2016 Equine Herpes Viruses Fair Grounds, New Orleans, LA Confirmed case(s): Quarantine
A diagnosis of equine herpesrvirus myeloencephalopathy (EHM) in one horse at the Fair Grounds racetrack in New Orleans, Louisiana has been confirmed by the attending veterinarian. The horse had a fever last week, became neurologic on December 25, 2016 and was euthanized. Laboratory test results on December 26th from the LSU diagnostic laboratory were positive for EHV-1, which can cause neurologic disease. The barn where the horse was stabled has been quarantined. Equine herpesvirus myeloencephalopathy is a reportable disease in Louisiana and is monitored by the State Veterinarian’s Office. More details and official information from the State Veterinarian’s Office will be provided as they become available. For more information on EHM go to: http://equinediseasecc.org/diseases.aspx
December 23, 2016 Strangles Escambia County, FL Confirmed case(s): Quarantine
On December 23, one premise in Escambia County, Florida was placed under quarantine for strangles. Per the owner, the horse was imported from the Bastrop kill pen facility in Louisiana on December 20. No animals have left the facility since clinical signs began. This is the first case in Escambia County and the 24th case for Florida in 2016.
December 21, 2016 Equine Herpes Viruses Inyo County, CA Outbreak Update
No new cases. CDFA continues to monitor the situation. On December 3, 2016, a 20 year-old Quarter Horse gelding displaying mild neurologic signs and located on a high desert ranch in Inyo County was confirmed positive for the neuropathogenic strain of Equine Herpesvirus-1. The gelding is part of a winter pack string of twenty-eight (28) horses and four (4) mules. On December 3, 2016, the premises was quarantined with enhanced biosecurity requirements. One additional equine herpesvirus myeloencephalopathy (EHM) and one EHV-1 febrile case was confirmed on the premises. The horses and mules were isolated in individual pens which limit disease spread. All confirmed positive horses continue to show improvement and are recovering.
December 21, 2016 Equine Herpes Viruses Los Angeles County, CA Outbreak Update
No new cases. CDFA continues to monitor the situation onsite. As of today, C Barn and the isolation area of the Los Angeles Equestrian Center remain under quarantine. Enhanced biosecurity measures continue for quarantined horses and horses’ temperatures continue to be monitored twice daily. The last febrile case occurred on December 12, 2016. Two (2) horses from isolation qualified to return to their home stalls through negative testing. There are currently two (2) horses in isolation and diagnostic testing indicates that neither of these two horses continues to shed the virus. Neither of the two (2) horses in isolation are febrile and neither are showing neurologic signs. Quarantine release will be based on no additional cases and horses in isolation continuing to test negative. As background information, the initial quarantine was placed on November 3, 2016. A total of 228 exposed horses were under quarantine at the peak of the outbreak. To date, fifteen (15) cases of equine herpesvirus-1 have been confirmed by the California Animal Health and Food Safety (CAHFS) Laboratory. Eight (8) of these horses displayed neurologic signs and were classified as equine herpesvirus myeloencephalopathy (EHM) cases. The remaining seven (7) horses were febrile with no signs of neurologic disease. One EHM horse was euthanized due to the severity of clinical signs.
December 21, 2016 West Nile Virus McCurtain County, OK Confirmed Case(s): No Quarantine
The 16th reported WNV positive horse has been confirmed for 2016 in Oklahoma. The 24 year old gelding located in McCurtain County was showing mild neurologic signs and was not vaccinated. For more information visit: http://www.ag.ok.gov
December 19, 2016 Equine Herpes Viruses Inyo County, CA Outbreak Update
As of December 19, 2016, two horses with equine herpesvirus myeloencephalopathy (EHM) due to the neuropathogenic strain of EHV-1 and one EHV-1 positive horse with a fever show improvement and are recovering. All confirmed positive horses continue to show improvement and are recovering. The premises remains in quarantine with enhanced biosecurity requirements. For background information on the Inyo county outbreak to date go to: https://www.cdfa.ca.gov/ahfss/animal_health/equine_herpes_virus.html
December 19, 2016 Equine Herpes Viruses Los Angeles County, CA Outbreak Update
As of December 19, 2016, C Barn and the isolation area of the Los Angeles Equestrian Center remain under quarantine. There are currently four (4) horses in isolation and diagnostic testing indicate three (3) of these horses are no longer shedding the virus. One horse continues to shed virus and will be re-sampled for EHV-1 testing. Currently, none of the four (4) horses in isolation are febrile and none are showing neurologic signs. Quarantine release will be based on having no additional cases with horses in isolation testing negative. For background information for the LAEC equine herpesvirus myeloencephalopathy outbreak to date go to: https://www.cdfa.ca.gov/ahfss/animal_health/equine_herpes_virus.html
December 17, 2016 Equine Herpes Viruses Inyo County, CA Outbreak Update
No additional confirmed cases of EHM, EHV-1 or new febrile horses have been identified at this time. This incident has two (2) EHM cases and one EHV-1 confirmed case. Both of the EHM cases continue to show improvement and all three are no longer shedding virus. 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 17, 2016 Equine Herpes Viruses Los Angeles County, CA Outbreak Update
There are currently four (4) horses in quarantined isolation at the Los Angeles Equestrian Center. Three (3) of these horses are no longer shedding EHV-1 virus. One of the horses continues 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 five (5) 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 continues in C Barn under quarantine and all horses’ temperatures continue to be monitored twice daily.