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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
March 30, 2017 Strangles Marion County, FL Confirmed case(s): Quarantine
On March 28 and 29, two premises, both in Marion County, Florida were placed under quarantine for strangles. The cases are unrelated. No horses have left either quarantined areas since clinical signs began. These are the third and fourth cases in Marion County and cases 13 and 14 for Florida in 2017
March 24, 2017 Equine Herpes Viruses Marion County, OR Confirmed case(s): Quarantine
A horse with neurologic signs was diagnosed with equine herpesvirus myeloencephalopathy (EHM) in Marion County Oregon. The horse began showing acute neurologic signs on Saturday March 18 and was immediately referred to Oregon State University-College of Veterinary Medicine (OSU-CVM). The diagnosis was made on March 20 by a positive test for both the EVH-1 wild type and neurotropic genetic markers. When horse’s condition deteriorated, it was euthanized. All horses at the Marion County property have been quarantined and strict biosecurity measures initiated. A second location in Marion County with a high-risk contact horse has also been quarantined. Quarantined horses are being closely monitored and there is no indication at this time that the virus has spread to other horses beyond those being quarantined, and there are no traces to other states. The Oregon Department of Agriculture will continue to work closely with all involved parties and is monitoring the situation very closely. Owners with questions about the neurologic form of EHV-1 should contact their veterinarian.
March 17, 2017 Strangles NV Information Only
Source: The Nevada Department of Agriculture

The Nevada Department of Agriculture has reported that the spread of equine strangles has slowed significantly over the last two weeks; however there are reports of new cases, predominantly in western Nevada, as recently as March 12. For more information go to

March 17, 2017 Equine Herpes Viruses San Diego County, CA Quarantine Released
Source: California Department of Food and Agriculture

March 16, 2017: The quarantine at the San Diego County premises has been released as the Equine Herpesvirus Myeloencephalopathy case has met the negative test requirement for quarantine release. There are no EHM cases under quarantine in California at this time. For more information go to

March 17, 2017 Equine Infectious Anemia Choctaw County, OK Confirmed Case(s): No Quarantine
The Oklahoma Department of Agriculture (ODAFF) has confirmed the first EIA positive horse for 2017 in Oklahoma. The 8 year old registered QH gelding located in Choctaw County was euthanized. Past EIA test history for this horse is unknown, but this horse was actively involved in rodeo and roping events. ODAFF recommends regular EIA testing for all horses, including those that do not leave the property, at least every 3 years.
March 16, 2017 Equine Herpes Viruses 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.
March 16, 2017 Equine Herpes Viruses MB Confirmed case(s): 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.
March 13, 2017 Equine Herpes Viruses KY 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.
March 10, 2017 Corona Virus 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
March 07, 2017 Strangles Jefferson County, FL Confirmed case(s): 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.