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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.

Or if you know the Alert ID number, use the filter below

Alert ID: 503
March 16, 2017
Denton County, TX
Quarantine Released
Texas Animal Health Commission (TAHC) officials released the premises quarantined for Equine Herpes Myeloencephalopathy (EHM), the neurologic disease linked to Equine Herpes Virus (EHV-1), in a Denton County barrel racing horse on March 15, 2017. There are no other reported EHM cases in Texas.
Alert ID: 502
March 16, 2017
Manitoba, Canada
Confirmed case(s): Official Quarantine
The Manitoba Horse Council has confirmed cases of Equine herpesvirus (EHV-1) which has caused abortions and neurologic disease starting 3 weeks ago in southwest Manitoba. Veterinarians initiated a strict quarantine of 105 horses on the property. Eight fatalities have resulted from neurologic disease with an additional 2 horses currently showing with neurologic signs. The premises is isolated with no movement of horses on or off the property since outbreak started. Strict biosecurity measures are in place.
Alert ID: 499
March 13, 2017
Kentucky, United States
Information Only
The KY Department of Agriculture has amended the procedures to be followed for horses originating from (or having been recently stabled) Fair Grounds Race Track in New Orleans destined to KY race tracks or their associated training facilities. Following the link below will open (Adobe Reader required) a document that describes the current requirements.
Alert ID: 498
March 10, 2017
Nevada County, CA
Investigation Initiated
Two horses in Nevada County were diagnosed with Equine Coronavirus according to the Nevada Agricultural Commissioner. Testing on other horses in the immediate contact area is underway. For more information go to
Alert ID: 482
March 07, 2017
Jefferson County, FL
Confirmed case(s): Official Quarantine

On March 7, one premise in Jefferson County, Florida was placed under quarantine for strangles. The horses from these “Kill Pen Rescues” are being advertised on Facebook and other social media with an individual’s name with the tagline Help Save Horses from Slaughter. A description including breed, age, sex, color, height, soundness, price plus additional Coggins fee and training level are routinely listed. These horses most often come from Louisiana, Mississippi and Tennessee. On Facebook, potential buyers are asked to comment with city and state to obtain an additional hauling fee. Somewhere on the ad, the horse’s deadline until slaughter, which is routinely 2 to 4 days away, will be listed. The ad will also contain the verbiage “No signs of sickness now!” and payment is by cash or Paypal. This case was recently imported from a Tennessee “Kill Pen Rescue” in late February without clinical signs at time of import. The horse developed clinical signs approximately 7 days after arriving into Florida where it is the only horse on the property. The horse has not left the facility since arrival. This the first case for Jefferson County and case 12 for Florida in 2017.

Alert ID: 481
February 24, 2017
Nevada, United States
Investigation Initiated
The Nevada Department of Agriculture has received multiple reports of horses exposed to equine herpesvirus type 4 (EHV-4) and Streptococcus equi (Strangles). The state veterinarian has recommended postponing some events and may issue quarantine orders after making confirmation of diagnoses. For more information go to
Alert ID: 480
February 23, 2017
New Orleans, LA
Quarantine Released
As of February 6, 2017, all barns were released from quarantine. As of February 15, 2017, the last horse in isolation tested negative for a second time and was released. With no more barns or horses under restrictions, the quarantine on the New Orleans Fair Grounds was removed on February 15, 2017.
Alert ID: 479
February 23, 2017
Denton County, TX
Confirmed case(s): Official Quarantine
Texas Animal Health Commission (TAHC) confirmed Equine Herpes Myeloencephalopathy (EHM), the neurologic disease linked to Equine Herpes Virus (EHV-1), in a Denton County barrel racing horse on February 21, 2017. The horse showed signs of ataxia, loss of coordination of the muscles, and other neurologic signs consistent with EHM when evaluated by a local veterinarian. The premises is under quarantine and TAHC staff is working closely with the owner and veterinarian to implement testing protocols and biosecurity measures. Prior to confirmation, the positive horse attended barrel racing events at the NRS Arena in Decatur, TX on February 15 and Northside Arena in Fort Worth, TX on February 14. The TAHC has been in contact with event management and veterinarians to ensure enhanced biosecurity measures are taken on the premises and event participants are notified. While the risk of exposure to the virus was likely low at these events, owners of horses potentially exposed are encouraged to take precautions. For more information go to
Alert ID: 466
February 20, 2017
San Diego County, CA
Outbreak Update
February 16, 2017: The confirmed quarantined Equine Herpesvirus Myeloencephalopathy (EHM) case in San Diego County is recovering. CDFA continues to monitor the situation. CDFA is aware of Equine Herpesvirus-1(EHV) circulating in horses previously stabled in Tent 21 of the HITS Thermal Show grounds. However, CDFA only has regulatory authority (ie quarantine issuance authority) over EHV-1 confirmed cases with neurologic signs (Equine Herpesvirus Myeloencephalopathy.) CDFA recommends exhibitors at the HITS Thermal Show follow enhanced biosecurity protocols.
Alert ID: 465
February 17, 2017
Durham Region, ON
Confirmed case(s): Official Quarantine
The Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA) has been notified of two confirmed cases of Equine Herpes Myeloencephalopathy (EHM), caused by equine herpes virus 1 (EHV-1).The horses from Durham Region were referred to the Ontario Veterinary College with neurological signs and are receiving treatment. Three other horses on the farm have tested positive for the mutated (neuropathogenic) strain of EHV-1 on nasal swabs but are not demonstrating neurological signs at this time. The farm owner has voluntarily placed the premises under a self-imposed quarantine to reduce the risk of viral spread.