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Disease 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.


    

Equine Herpesvirus- Neurologic
Sonoma County, CA
Outbreak Identifier: 4776
Alert ID: 2145
July 29, 2021
Outbreak Update

California Department of Food and Agriculture

Number Confirmed: 6;
Number Suspected: 4;
Facility Type: Showgrounds;
Age: 6; Gender: Mare; Breed: Warmblood (WB); Onset of Clinical Signs: 7/23/2021;
Clinical Signs: Hind-end Weakness, limb edema, Nystagmus, Recumbency; Confirmation Date: 7/24/2021; Horse Status: Euthanized; Vaccination Status: Vaccinated;
Notes: Update 7-29-21 Original Alert ID: 2139: One additional 15-year-old Warmblood mare from the index Sacramento county home premises who attended, and was asymptomatic at, the Sonoma county event displayed mild neurological signs and was transported to an offsite veterinary hospital in isolation on July 27th and confirmed negative for EHV-1 on July 28th. No additional horses from the Sonoma county event or the home premise have shown clinical signs at this time. CDFA continues to actively monitor this situation.;

Equine Infectious Anemia
Cariboo Subdivision, BC
Outbreak Identifier: 4780
Alert ID: 2144
July 28, 2021
Confirmed Case(s) - Official Quarantine

Canadian Food Inspection Agency

Number Confirmed: 1;
Notes: On July 19, 2021, positive equine infectious anemia (EIA) results were confirmed by the Canadian Food Inspection Agency’s (CFIA) national reference laboratory for a horse located on a premises in Cariboo, Subdivision C, British Columbia. The horse had been tested by an accredited veterinarian at the owner’s request to fulfill a requirement prior to being moved to another premises. No clinical signs were noted at the time of sampling. A CFIA investigation is underway and as per program policy, movement controls have been placed on the infected horse and any on-premises contact animals. Initial reports indicate there are other equines on the affected premises. Movement controls will remain until all disease response activities have been completed, including follow-up testing and ordering the destruction of confirmed cases. Trace-out activities may require the CFIA to undertake actions at additional premises as outlined in the current policy.

Equine Herpesvirus- Neurologic
State of Kentucky, KY
Alert ID: 2143
July 28, 2021
Information Only

Kentucky Department of Agriculture

Saratoga EHV Quarantine- KY Update and Position 7/28/2021

Notes: Due to Kentucky’s inability to adequately isolate new arrivals on the grounds of Kentucky tracks and training facilities and out of an abundance of caution, additional requirements will be placed on horses from Saratoga Race Course requesting entry to Kentucky tracks and associated training centers after July 31st. Horses which have recently (since July 31st) been on the grounds at Saratoga can qualify for approval to enter a KY track or sanctioned training center, if they have documentation demonstrating they were off the grounds prior to July 31st OR have been tested by PCR after July 31st and reported negative for EHV-1 on both nasal swab and whole blood – EDTA samples. A Certificate of Veterinary Inspection for the horse(s) from the point where the sample was collected needs to be issued for movement to the Kentucky racing or training facility and must document the EHV1 testing and current health assessment in addition to meeting the normal entry requirements that includes EHV1 vaccination and EIA test certificate.

Strangles
Clark County, WA
Outbreak Identifier: 4779
Alert ID: 2142
July 28, 2021
Confirmed Case(s) - Voluntary Quarantine

Washington State Veterinary Office

Number Confirmed: 1;
Facility Type: Private Facility;
Notes: A horse at a private facility in Clark County has tested positive for Strangles. The premises in under a voluntary quarantine. For more information about Strangles go to the Strangles factsheet. 

Equine Herpesvirus- Neurologic
Sonoma County, CA
Outbreak Identifier: 4776
Alert ID: 2141
July 27, 2021
Outbreak Update

California Department of Food and Agriculture

Number Confirmed: 6;
Number Suspected: 4;
Facility Type: Showgrounds;
Age: 6; Gender: Mare; Breed: Warmblood (WB); Onset of Clinical Signs: 7/23/2021;
Clinical Signs: Hind-end Weakness, limb edema, Nystagmus, Recumbency; Confirmation Date: 7/24/2021; Horse Status: Euthanized; Vaccination Status: Vaccinated;
Notes: Update 7/27/21 Original Alert ID- 2139: The eighteen (18) horses from the index case’s origin premises that attended the Sonoma county event returned to their home premises in Sacramento County on Sunday July 25th and are quarantined. The horse in this cohort with a fever on July 24th with tests pending was confirmed positive for EHV-1 and remains isolated at the home premises, and has been afebrile since Saturday July 24th. On Monday July 26th, CDFA staff performed a site visit at the home premises in Sacramento county. One horse on the Sacramento home premises that did not attend the Sonoma county event and previously tested positive for EHV-1 (fever only) became neurologic on Monday July 26th and has been sent to an offsite veterinary hospital for treatment. He is in stable condition and was confirmed negative for EHV-1 on Monday, July 26th. One additional horse at the home premises that did attend the Sonoma County event and has remained afebrile also became neurologic on Monday July 26th and has been sent to an offsite veterinary hospital for treatment, and was confirmed negative for EHV-1 on Monday July 26th. She is currently alive and in stable condition. One additional horse that was housed in the same barn at the Sonoma County event presented with fever and mild neurologic signs on Saturday July 24th and was sent to an offsite veterinary hospital for treatment was confirmed negative for EHV-1 on Monday July 26th. He is currently alive and in stable condition. The three remaining horses in this same barn returned to their home premises on Saturday July 25th and are isolated with temperature monitoring and no fevers or clinical signs have been detected. The total number of confirmed cases in this incident are: 1 (one) confirmed EHM case (EHV-1 positive with neurologic signs), 1 (one) new confirmed EHV-1 case (fever and/or edema) only, with 4 (four) previously presumptive positive EHV-1 cases (fever and/or edema only) that have subsequently retested and confirmed negative. In total, one (1) horse in this incident has been euthanized and the other affected horses are alive and under veterinary care. As of Monday July 26th, there is no evidence of ongoing EHV-1 spread at the Sonoma County facility following removal of all known affected and immediately exposed horses. A complete facility quarantine will not be implemented there unless ongoing disease spread is confirmed. The decision for individuals to attend an event at this premises within this timeframe should be discussed with their veterinarians and will be at the owner’s and/or trainer’s own discretion and risk. CDFA recommends that any horses that attended or are currently attending the Sonoma County event be temperature monitored for at least seven (7) days and are isolated at least thirty (30) feet from other horses when they return to their home properties. CDFA was onsite at the Sonoma County event premises on July 27th, and continues to actively monitor the situation.;

West Nile Virus
Yakima County, WA
Outbreak Identifier: 4778
Alert ID: 2140
July 26, 2021
Confirmed Case(s) - No Quarantine

Washington State Veterinary Office

Number Confirmed: 1;
Facility Type: Private Facility;
Horse Status: Euthanized; Vaccination Status: Status Unknown;
Notes: A horse at a private facility in Yakima County has tested positive for West Nile Virus.

Equine Herpesvirus- Neurologic
Sonoma County, CA
Outbreak Identifier: 4776
Alert ID: 2139
July 25, 2021
Confirmed Case(s) - Official Quarantine

California Department of Food and Agriculture

Number Confirmed: 5;
Number Suspected: 4;
Number Exposed: 19
Facility Type: Showgrounds;
Horse #1: Age: 6; Gender: Mare; Breed: Warmblood (WB); Onset of Clinical Signs: 7/23/2021;
Clinical Signs: Hind-end Weakness, Limb edema, Nystagmus, Recumbency; Confirmation Date: 7/24/2021; Horse Status: Euthanized; Vaccination Status: Vaccinated;

Horse #2: Age: 15; Gender: Gelding; Breed: Warmblood (WB); Onset of Clinical Signs: 7/22/2021;
Clinical Signs: Ataxia, Cranial Nerve Deficit, Fever, Neurologic Signs, Urine Dribbling; Confirmation Date: 7/23/2021; Horse Status: Affected And Alive; Vaccination Status: Status Unknow

Notes: A 6-year-old Warmblood mare displaying neurological signs has been confirmed positive for EHM secondary to EHV-1. She attended a show in Sonoma County from 7/19-7/24 but did not compete, and event management has notified all participants to monitor temperatures twice daily and report any fevers or neurologic signs to their veterinarians and CDFA, as well as isolate all horses returning from shows at their home premises for at least 7 days. CDFA was onsite, and 19 exposed horses from the index mare’s barn were removed from the show facility and have been isolated and quarantined at the home premises in Sacramento County with the remaining 18 horses at the home premises with twice daily temperature monitoring and enhanced biosecurity measures. Six (6) horses from the home premises displaying fever and/or limb edema have also tested positive for EHV-1. A 15-year-old Warmblood gelding at the home premises that was febrile and tested positive for EHV-1 began displaying neurological signs, ataxia, urine dribbling, and cranial nerve deficits and was moved to isolation under quarantine at a veterinary hospital for care. CDFA continues to actively monitor the situation.;  For more information go to:  Equine Herpesvirus Myeloencephalopathy

Equine Herpesvirus- Neurologic
Owyhee County, ID
Outbreak Identifier: 4775
Alert ID: 2138
July 23, 2021
Confirmed Case(s) - Voluntary Quarantine

Idaho State Department of Agriculture

Number Confirmed: 1;
Number Exposed: 40;
Facility Type: Farm;
 Gender: Mare; Onset of Clinical Signs: 7/20/2021;
Clinical Signs: Recumbent, Unable to Stand;  Horse Status: Recovering; Vaccination Status: Not Reported;
Notes: The mare are was recumbent and unable to stand on 7/20/21. On 7/23, horse had recovered to the point of being able to stand and walk. No other horses on the property are demonstrating clinical symptoms. For more information go to:  EHV-1

Potomac Horse Fever
Hawkins, Robertson, Sullivan Counties, TN
Alert ID: 2137
July 23, 2021
Confirmed Case(s) - No Quarantine

Tennessee State Veterinarian

 

Hawkins County

Number Confirmed: 1;
Facility Type: Farm;
Vaccination Status: Not Reported;
Notes: None;

 

Robertson County

Number Confirmed: 1;
Facility Type: Farm;
Vaccination Status: Not Reported;
Notes: None;

 

Sullivan County

Number Confirmed: 1;
Facility Type: Farm;
Vaccination Status: Not Reported;
Notes: None;

Potomac Horse Fever
Norfolk County, MA
Outbreak Identifier: 4771
Alert ID: 2136
July 23, 2021
Confirmed Case(s) - No Quarantine

Massachusetts State Veterinary Office

Number Confirmed: 1;
Facility Type: Boarding Facility;
Clinical Signs: Fever, Inappetance, lethargy; Confirmation Date: 7/19/2021; Horse Status: Affected And Alive; 
Notes: A horse at a boarding facility in Norfolk County has tested positive for Potomac Horse Fever