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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.


June 13, 2018
Equine Infectious Anemia
Bastrop County, TX
Outbreak Update
Source: Texas Animal Health Commission

On March 8, 2018, Texas Animal Health Commission reported a confirmed EIA case in Bastrop County to the EDCC. Since that time, two additional horses from the quarantined premises have been confirmed positive for EIA. The positive horses have been euthanized and the premises will remain under quarantine until requirements for release have been met.

June 08, 2018
Equine Herpes Viruses
York County, ME
Quarantine Released
Source: Maine State Veterinarian's Office

On Friday, June 8, 2018, the Office of the Maine State Veterinarian released the quarantine of a private facility in York County, Maine. The facility had been in quarantine since May 15, 2018 after a Standardbred mare was confirmed to have Equine Herpesvirus Myeloencphalopathy (EHM). The index case was euthanized. No other horses have been affected.

June 07, 2018
Equine Infectious Anemia
Josephine County, OR
Quarantine Released
Source: Office of the Oregon State Veterinarian

On June 1 the USDA National Veterinary Services Laboratory (NVSL) confirmed the presumptive positive Equine Infectious Anemia (EIA) status of a seven-year-old Quarter Horse tested by the Oregon Department of Agriculture Animal Health Laboratory. The positive horse was detected by routine testing and did not show any clinical signs of disease. The positive horse had been housed at the Grants Pass Downs located on the Josephine County Fairgrounds. A quarantine was placed on the facility and an epidemiological investigation by an ODA staff veterinarian was conducted. It was determined that there were 37 at-risk horses stabled with the positive horse. Additionally, the investigation discovered another 20 at-risk horses located on three farms in the area. Samples from all 57 horses were collected and submitted to NVSL to determine if any of the at-risk horses were infected with the disease. There was no record of recent interstate travel by any of the at-risk horses. The testing results from the 57 at-risk horses were received Thursday afternoon (June 7) and all horses tested negative. The positive horse was humanely euthanized and removed from the Fairgrounds area on Tuesday June 6. The quarantine that was placed on the Josephine County Fairgrounds has been lifted.

June 06, 2018
Potomac Horse Fever
Bourbon County, KY
Confirmed Case(s): No Quarantine
Source: Kentucky State Veterinarian's Office

On Tuesday, June 5, 2018, the Kentucky State Veterinarian’s Office confirmed a case of Potomac Horse Fever in Bourbon County. A 2017 Thoroughbred filly presented on Tuesday, May 29, 2018 with acute watery diarrhea of 48-hour duration, dehydration, and had been febrile. PCR testing of whole blood and feces confirmed the diagnosis of Potomac Horse Fever. Treatment was begun on Tuesday, June 5, 2018. The filly appeared much improved and is expected to make a full recovery. This is Kentucky’s second confirmed case of Potomac Horse Fever in 2018. Investigations support no direct correlation or relationship between the previous case identified on June 1, 2018.

June 04, 2018
Potomac Horse Fever
Bourbon County, KY
Confirmed Case(s): No Quarantine
Source: Kentucky State Veterinarian's Office

On Friday, June 1, 2018, the Kentucky State Veterinarian's office confirmed a case of Potomac Horse Fever in Bourbon County. A 4-year-old Thoroughbred filly in Bourbon County, Kentucky that presented with profuse and watery diarrhea, lethargy, and a fever of 104 ° F is hospitalized in isolation. Fecal PCR testing confirmed the presence of Potomac Horse Fever. Symptoms began to resolve over the weekend following treatment. On Monday, June 4, 2018, the patient is described as significantly improved with a favorable prognosis. This is Kentucky's first confirmed case of Potomac Horse Fever in 2018. For more information on Potomac Horse Fever, please visit https://aaep.org/sites/default/files/Documents/PotomacHorseFever_Final.pdf .

June 01, 2018
Equine Infectious Anemia
Josephine County, OR
Confirmed case(s): Official Quarantine
Source: Oregon Department of Agriculture

The Oregon Deptartment of Agriculture Animal Health Laboratory detected a presumptive positive Equine Infectious Anemia (EIA) horse during routine Coggins testing on Tuesday, May 29, 2018. Confirmatory testing by the USDA National Veterinary Services Laboratory (NVSL) is in progress. ODA is proceeding with preliminary disease control actions. The presumptive positive horse is a seven year old Quarter Horse mare currently housed at the Grants Pass Downs on the Josephine County Fairgrounds. A quarantine has been issued and follow-up tracing and testing for high-risk contact horses is underway. The presumptive positive horse originates from a farm in southern Oregon. There is no known history of interstate travel at this point in time. There has been excellent cooperation with owners, facility managers and other officials. Updates will be provided as the investigation progresses.

May 31, 2018
Equine Herpes Viruses
Stutsman County, ND
Confirmed case(s): Official Quarantine
Source: North Dakota Department of Agriculture

On May 16, 2018, the North Dakota Department of Agriculture reported one confirmed case of Equine Herpesvirus Myeloencephalopathy (EHM) in a Stutsman County horse. The horse began showing clinical signs on May 11, 2018 and was euthanized the next day due to poor prognosis. Horses that were exposed within 72 hours prior to the onset of clinical illness are under quarantine. For more information about EHM go to:https://aaep.org/sites/default/files/Documents/DiseaseFactsheetEHM.pdf

May 29, 2018
Equine Herpes Viruses
Williamson County, TX
Confirmed case(s): Official Quarantine
Source: Texas Animal Health Commission

Texas Animal Health Commission (TAHC) confirmed Equine Herpes Myeloencephalopathy (EHM), in a Williamson County barrel racing horse on May 24, 2018. This is the third case of EHM in Texas in May 2018. The newly identified horse showed signs of nasal discharge and ataxia when evaluated by a local veterinarian and EHV-1 was confirmed by a recognized laboratory. The premises is under movement restrictions and TAHC staff is working closely with the owner and veterinarian to monitor potentially exposed horses and implement biosecurity measures. Prior to confirmation of EHM, the horse attended a private training facility in Liberty Hill, Texas on May 11 and barrel racing events at the Killeen Rodeo Outdoor Arena on May 12 and Williamson County Expo Center on May 5. TAHC has contacted event management, veterinarians and the training facility to ensure enhanced surveillance and biosecurity measures are taken. For more information about EHM go to:https://aaep.org/sites/default/files/Documents/DiseaseFactsheetEHM.pdf

 

May 28, 2018
Eastern Equine Encephalitis
Marion, Putnam, Nassau, and Alachua counties, FL
Confirmed Case(s): No Quarantine
Source: Florida Department of Agriculture and Consumer Services

The Florida Department of Agriculture and Consumer Services has reported six confirmed cases of Eastern Equine Encephalitis. One horse in Marion County was confirmed positive on May 1st, 2018. The eight-year old unvaccinated Paso Fino became clinical on April 23rd and was humanely euthanized on April 24th due to a poor prognosis. One horse in Putnam County was also confirmed positive on May 1st. The three-year old Quarter Horse became clinical on April 21st and was humanely euthanized on April 24th due to a poor prognosis. The horse was reportedly vaccinated by the owner 5 months prior. One horse in Nassau County was confirmed positive on May 3rd. The four-year old unvaccinated Thoroughbred became clinical on April 30th and was humanely euthanized the same day due to a poor prognosis. One horse in Alachua County was confirmed positive on May 8th. The four-year old unvaccinated Minature Horse became clinical on May 5th and was humanely euthanized the same day due to a poor prognosis. One horse in Marion County was confirmed positive on May 16th. The one-year old unvaccinated Minature Horse became clinical on May 3rd and was humanely euthanized on May 5th due to a poor prognosis. One horse in Marion County was confirmed positive on May 21st. The ten-year old unvaccinated Thoroughbred became clinical on May 14th and was humanely euthanized the same day due to a poor prognosis. 

May 25, 2018
Equine Herpes Viruses
Oakland County, MI
Quarantine Released
Source: Michigan Department of Agriculture and Rural Development

On May 21, 2018, the Michigan Department of Agriculture and Rural Development released the quarantine of a standardbred gelding. The horse, which had been removed from Washtenaw County, had been isolated and under quarantine in Oakland County due to developing neurologic signs and subsequently testing positive for equine herpesvirus-1 (EHV-1). The horse has since recovered and has tested negative for EHV-1 via two consecutive polymerase chain reaction tests seven days apart. The quarantine in Washtenaw County was released on April 17, after 21 consecutive days without the presence of fevers or clinical signs.