Ontario Equine Disease Alerts

Disease Surveillance Portal

To view the Ontario Equine Disease interactive map and dashboard, click here:

Equine Immediately Notifiable Disease Surveillance in Ontario

Equine Influenza

Simcoe County, ON

Alert ID: 2024-65

November 18, 2024

Source: OMAFA

Number Confirmed: 2;
Number Suspected: Unknown;
Number Exposed: Unknown;
Facility Type: Private Facility;

Horse 1:
Gender: Mare; Breed: Miniature Horse; Onset of Clinical Signs: 11/4/2024; Clinical Signs: Fever, coughing and nasal discharge in a group of miniature horses. Two minis were new to the property, were housed separately for two weeks but were adjacent to the resident herd’s paddock.; Horse Status: Recovering; Vaccination Status: Unvaccinated;

Comments: The farm owner has instituted voluntary animal movement restrictions and is working with their veterinarian on biosecurity measures.;

Equine Influenza

City of Ottawa, ON

Alert ID: 2024-64

November 12, 2024

Source: OMAFA

Number Confirmed: 1;
Number Suspected: Unknown;
Number Exposed: Unknown;
Facility Type: Private Facility;

Horse 1:
Age: 2; Gender: Colt; Breed: Draft; Onset of Clinical Signs: 10/31/2024; Clinical Signs: This colt is one of several horses on the farm that developed a fever, cough and nasal discharge.; Confirmation Date: 11/5/2024; Horse Status: Recovering;

Comments: The farm owner has instituted voluntary animal movement restrictions and is working with their veterinarian.;

Equine Influenza

Lanark County, ON

Alert ID: 2024-63

November 06, 2024

Source: OMAFA

Number Confirmed: 1;
Number Exposed: 1;
Facility Type: Private Facility;

Horse 1:
Age: 24; Gender: Gelding; Breed: Thoroughbred (TB); Onset of Clinical Signs: 10/17/2024; Clinical Signs: This gelding developed a cough and nasal discharge on October 17 . Only one other horse is on the property and he is vaccinated for influenza and not showing any signs.; Confirmation Date: 11/2/2024; Horse Status: Recovering; Vaccination Status: Undervaccinated;

Comments: The farm owner has instituted voluntary animal movement restrictions and is working with their veterinarian.;

Equine Influenza

United Counties of Leeds and Grenville, ON

Alert ID: 2024-62

November 06, 2024

Source: OMAFA

Number Confirmed: 1;
Number Suspected: 9;
Number Exposed: 20;
Facility Type: Private Facility;

Horse 1:
Age: Yearling; Gender: Colt; Breed: Warmblood (WB); Onset of Clinical Signs: 10/28/2024; Clinical Signs: This yearling developed a fever and nasal discharge around October 28. About 8 to 10 other horses are affected with fever/nasal discharge/cough. Many are under- or unvaccinated for influenza. Those horses that are vaccinated for influenza, because they leave the property, are minimally affected.; Horse Status: Recovering; Vaccination Status: Unvaccinated;

Comments: The facility is under voluntary animal movement restrictions and the owner is working with their veterinarian on biosecurity.;

Equine Herpesvirus- Neurologic

Grey County, ON

Alert ID: 2024-61

October 30, 2024

Source: OMAFA

Number Confirmed: 1;
Number Exposed: 3;
Facility Type: Private Facility;

Horse 1:
Age: 20; Gender: Gelding; Breed: Mixed breed; Onset of Clinical Signs: 10/24/2024; Clinical Signs: This gelding showed acute neurologic signs that progressed rapidly to recumbency then seizures.; Confirmation Date: 10/29/2024; Horse Status: Euthanized;

Comments: The facility owner has voluntarily stopped animal movements and is working with their veterinarian to implement biosecurity protocols.;

For more information, visit:

Equine Herpesvirus- Neurologic

Elgin County, ON

Alert ID: 2024-60

October 30, 2024

Source: OMAFA

Number Confirmed: 1;
Number Exposed: 2;
Facility Type: Private Facility;

Horse 1:
Age: 4; Gender: Mare; Breed: Standardbred; Onset of Clinical Signs: 10/28/2024; Clinical Signs: This mare developed acute neurologic signs and is responding well to supportive treatment.; Confirmation Date: 10/29/2024; Horse Status: Recovering;

Comments: The facility owner has voluntarily stopped animal movements and is working with their veterinarian to implement biosecurity protocols.;

For more information, visit:

West Nile Virus

Middlesex County, ON

Alert ID: 2024-59

October 24, 2024

Source: OMAFA

Number Confirmed: 1;
Number Exposed: Unknown;

Horse 1:
Age: 4; Gender: Mare; Breed: Welsh Cross; Onset of Clinical Signs: 10/10/2024; Clinical Signs: This pony mare was referred to an equine hospital with acute neurologic signs (ataxia and front limb hypermetria), dullness, lethargy and muscle fasciculations. She received supportive treatment and is recovering.; Confirmation Date: 10/23/2024; Horse Status: Recovering; Vaccination Status: Undervaccinated;

Comments: This is the 11th equine case of WNV in Ontario this year. To see past and present WNV cases in Ontario go to: https://www.oahn.ca/resources/ontario-equine-disease-alerts/ and enter the disease surveillance portal. To see past and present WNV cases in Canada, go to: https://cahss.ca/cahss-networks/equine and enter the equine dashboard.;;

Eastern Equine Encephalitis

Haldimand County, ON

Alert ID: 2024-58

October 23, 2024

Source: OMAFA

Number Confirmed: 1;
Number Exposed: Unknown;

Horse 1:
Age: 13; Gender: Mare; Breed: Pony; Onset of Clinical Signs: 10/9/2024; Clinical Signs: This pony mare developed a fever (40.5 C) on October 9 along with acute neurologic signs that progressed to recumbency. She was euthanized on October 10 after developing seizures.; Confirmation Date: 10/21/2024; Horse Status: Euthanized; Vaccination Status: Unvaccinated;

Comments: This is the 24th case of equine EEE in Ontario this year. To see past and present EEE cases in Ontario go to: https://www.oahn.ca/resources/ontario-equine-disease-alerts/ and enter the disease surveillance portal. To see past and present EEE cases in Canada, go to: https://cahss.ca/cahss-networks/equine and enter the equine dashboard;;

West Nile Virus

Hastings County, ON

Alert ID: 2024-57

October 23, 2024

Source: OMAFA

Number Confirmed: 1;
Number Exposed: Unknown;

Horse 1:
Age: 2; Gender: Gelding; Breed: Friesian; Onset of Clinical Signs: 10/5/2024; Clinical Signs: This gelding developed a fever (39 C) and ataxia on October 5. His condition worsened despite supportive care and he was euthanized on October 7.; Confirmation Date: 10/21/2024; Horse Status: Euthanized; Vaccination Status: Unvaccinated;

Comments: This is the 10th equine case of WNV in Ontario this year. To see past and present WNV cases in Ontario go to: https://www.oahn.ca/resources/ontario-equine-disease-alerts/ and enter the disease surveillance portal. To see past and present WNV cases in Canada, go to: https://cahss.ca/cahss-networks/equine and enter the equine dashboard.;

West Nile Virus

District of Thunder Bay, ON

Alert ID: 2024-56

October 15, 2024

Source: OMAFA

Number Confirmed: 1;
Number Exposed: 1;

Horse 1:
Gender: Gelding; Clinical Signs: This gelding was noted to be “not quite right” by the owner a few days before he was examined by the veterinarian on September 23rd who diagnosed a low grade fever, muscle fasciculations of the triceps muscle and sore front feet. Upon re-examination a few days later, he was noted to have twitching of the lower lip and ataxia. He has since recovered.; Confirmation Date: 10/10/2024; Horse Status: Recovered; Vaccination Status: Unvaccinated;

Comments: This is the 9th equine case of WNV in Ontario this year. To see past and present WNV cases in Ontario go to: https://www.oahn.ca/resources/ontario-equine-disease-alerts/ and enter the disease surveillance portal. To see past and present WNV cases in Canada, go to: https://cahss.ca/cahss-networks/equine and enter the equine dashboard.;

West Nile Virus

Dufferin County, ON

Alert ID: 2024-55

October 11, 2024

Source: OMAFA

Number Confirmed: 2;
Number Exposed: Unknown;
Facility Type: Boarding Facility;

Horse 1:
Gender: Mare; Breed: Paint; Onset of Clinical Signs: 9/29/2024; Clinical Signs: Two mares that shared a paddock developed ataxia on September 29. One mare was also hyperaesthetic and had twitching of the muzzle.; Confirmation Date: 10/10/2024; Horse Status: Recovered; Vaccination Status: Unvaccinated;

Comments: These are the 7th and 8th equine cases of WNV in Ontario this year. To see past and present WNV cases in Ontario go to: https://www.oahn.ca/resources/ontario-equine-disease-alerts/ and enter the disease surveillance portal. To see past and present WNV cases in Canada, go to: https://cahss.ca/cahss-networks/equine and enter the equine dashboard.;

Eastern Equine Encephalitis

Lanark County, ON

Alert ID: 2024-54

October 11, 2024

Source: OMAFA

Number Confirmed: 1;
Number Exposed: 1;

Horse 1:
Age: 13; Gender: Gelding; Onset of Clinical Signs: 9/27/2024; Clinical Signs: This gelding was acutely neurologic on September 27 and was euthanized on September 28 when his condition deteriorated and he became recumbent.; Confirmation Date: 10/9/2024; Horse Status: Euthanized; Vaccination Status: Unvaccinated;

Comments: This is the 23rd case of equine EEE in Ontario this year. To see past and present EEE cases in Ontario go to: https://www.oahn.ca/resources/ontario-equine-disease-alerts/ and enter the disease surveillance portal. To see past and present EEE cases in Canada, go to: https://cahss.ca/cahss-networks/equine and enter the equine dashboard;

Eastern Equine Encephalitis

United Counties of Leeds and Grenville, ON

Alert ID: 2024-53

October 08, 2024

Source: OMAFA

Number Confirmed: 1;
Number Exposed: Unknown;

Horse 1:
Gender: Mare; Breed: Pony; Onset of Clinical Signs: 9/15/2024; Clinical Signs: This pony mare started showing acute neurologic signs on September 15 (circling, head pressing, falling against the fence, stumbling, weakness, hypermetria). She was administered supportive treatment but was euthanized two days later as her clinical signs worsened.; Confirmation Date: 10/2/2024; Horse Status: Euthanized; Vaccination Status: Unvaccinated;

Comments: This is the 20th case of equine EEE in Ontario this year. To see past and present EEE cases in Ontario go to: https://www.oahn.ca/resources/ontario-equine-disease-alerts/ and enter the disease surveillance portal. To see past and present EEE cases in Canada, go to: https://cahss.ca/cahss-networks/equine and enter the equine dashboard.;

Eastern Equine Encephalitis

Middlesex County, ON

Alert ID: 2024-52

October 08, 2024

Source: OMAFA

Number Confirmed: 1;
Number Exposed: Unknown;

Horse 1:
Age: Yearling; Gender: Filly; Breed: Draft; Onset of Clinical Signs: 9/21/2024; Clinical Signs: This filly developed acute neurologic signs (obtunded, ataxic) on September 21. She died later that day.; Confirmation Date: 10/7/2024; Horse Status: Deceased; Vaccination Status: Unvaccinated;

Comments: This is the 21st case of equine EEE in Ontario this year. To see past and present EEE cases in Ontario go to: https://www.oahn.ca/resources/ontario-equine-disease-alerts/ and enter the disease surveillance portal. To see past and present EEE cases in Canada, go to: https://cahss.ca/cahss-networks/equine and enter the equine dashboard.;

Eastern Equine Encephalitis

United Counties of Prescott and Russell, ON

Alert ID: 2024-51

October 08, 2024

Source: OMAFA

Number Confirmed: 1;
Number Exposed: Unknown;

Horse 1:
Age: 15; Breed: Quarter Horse Cross; Onset of Clinical Signs: 9/22/2024; Clinical Signs: This horse developed acute neurologic signs (severe ataxia, muscle tremors, reduced PLR, obtunded) on September 22. She was euthanized later that evening due to progressive neurologic signs.; Confirmation Date: 10/7/2024; Horse Status: Euthanized; Vaccination Status: Unvaccinated;

Comments: This is the 22nd case of equine EEE in Ontario this year. To see past and present EEE cases in Ontario go to: https://www.oahn.ca/resources/ontario-equine-disease-alerts/ and enter the disease surveillance portal. To see past and present EEE cases in Canada, go to: https://cahss.ca/cahss-networks/equine and enter the equine dashboard.;

West Nile Virus

District of Thunder Bay, ON

Alert ID: 2024-50

October 1, 2024

Source: OMAFA

Number Confirmed: 1;
Number Exposed: 1;

Horse 1:
Age: 4; Gender: Gelding; Breed: Arabian; Clinical Signs: This gelding was noted to be stumbling with a low grade fever.; Confirmation Date: 9/27/2024; Horse Status: Recovering; Vaccination Status: Unvaccinated;

Comments: This is the 6th equine case of WNV in Ontario this year. To see past and present WNV cases in Ontario go to: https://www.oahn.ca/resources/ontario-equine-disease-alerts/ and enter the disease surveillance portal. To see past and present WNV cases in Canada, go to: https://cahss.ca/cahss-networks/equine and enter the equine dashboard.

Eastern Equine Encephalitis

United Counties of Stormont, Dundas and Glengarry, ON

Alert ID: 2024-49

October 01, 2024

Source: OMAFA

Number Confirmed: 1;
Number Exposed: 1;

Horse 1:
Age: 3; Gender: Filly; Onset of Clinical Signs: 9/5/2024; Clinical Signs: This filly was noticed to be ataxic with an abnormally quiet demeanor and fever (41C) on Sept 5. Despite supportive treatment, she passed away on Sept 7.; Confirmation Date: 9/30/2024; Horse Status: Deceased; Vaccination Status: Unvaccinated;

Comments: This is the 19th case of equine EEE in Ontario this year. To see past and present EEE cases in Ontario go to: https://www.oahn.ca/resources/ontario-equine-disease-alerts/ and enter the disease surveillance portal. To see past and present EEE cases in Canada, go to: https://cahss.ca/cahss-networks/equine and enter the equine dashboard.

Eastern Equine Encephalitis

Hastings County, ON

Alert ID: 2024-48

September 25, 2024

Source: OMAFA

Number Confirmed: 1;
Number Exposed: 3;

Horse 1:
Age: 4; Gender: Stallion; Breed: Miniature Horse; Onset of Clinical Signs: 9/11/2024; Clinical Signs: This stallion was normal on September 10. On the morning of September 11 he began to stand off by himself , and then became febrile, recumbent and was seizuring, salivating/foaming at the mouth, and blind. He was euthanized.; Confirmation Date: 9/23/2024; Horse Status: Euthanized; Vaccination Status: Unvaccinated;

Comments: This is the 18th case of equine EEE in Ontario this year. To see past and present EEE cases in Ontario go to: https://www.oahn.ca/resources/ontario-equine-disease-alerts/ and enter the disease surveillance portal. To see past and present EEE cases in Canada, go to: https://cahss.ca/cahss-networks/equine and enter the equine dashboard.;

Eastern Equine Encephalitis

Lambton County, ON

Alert ID: 2024-47

September 20, 2024

Source: OMAFA

Number Confirmed: 1;
Number Exposed: Unknown;

Horse 1:
Age: 13; Gender: Gelding; Breed: Quarter Horse (QH); Onset of Clinical Signs: 8/29/2024; Clinical Signs: This gelding developed generalized ataxia with weakness in the right front and hind limbs on Aug 29. He was clinically normal on Aug 28. He was treated supportively and remains alive but with some neurologic deficits.; Confirmation Date: 9/19/2024; Horse Status: Affected And Alive; Vaccination Status: Undervaccinated;

Comments: This is the 17th case of equine EEE in Ontario this year. To see past and present EEE cases in Ontario go to: https://www.oahn.ca/resources/ontario-equine-disease-alerts/ and enter the disease surveillance portal. To see past and present EEE cases in Canada, go to: https://cahss.ca/cahss-networks/equine and enter the equine dashboard.;

Strangles

Renfrew County, ON

Alert ID: 2024-46

September 19, 2024

Source: OMAFA

Number Confirmed: 1;
Number Suspected: 5;
Number Exposed: Unknown;
Facility Type: Boarding Facility;

Horse 1:
Age: 6; Gender: Gelding; Breed: Arabian; Clinical Signs: Fever, cough, submandibular lymph node swelling. Swab was positive on PCR for S. equi.; Confirmation Date: 9/16/2024; Horse Status: Recovering;

Comments: The facility manager has instituted voluntary movement restrictions and biosecurity measures upon the advice of their veterinarian. To see past and present Strangles cases in Ontario go to: https://www.oahn.ca/resources/ontario-equine-disease-alerts/ and enter the disease surveillance portal.;

For more information, visit:

Equine Strangles Resources

West Nile Virus

Lambton County, ON

Alert ID: 2024-45

September 17, 2024

Source: OMAFA

Number Confirmed: 1;
Number Exposed: Unknown;

Horse 1:
Age: 3; Gender: Filly; Breed: Standardbred; Clinical Signs: This filly was found down by the owner and developed muscle fasciculations of the head and shoulder.; Confirmation Date: 9/16/2024; Horse Status: Deceased; Vaccination Status: Unvaccinated;

Comments: To see past and present WNV cases in Ontario go to: https://www.oahn.ca/resources/ontario-equine-disease-alerts/ and enter the disease surveillance portal. To see past and present WNV cases in Canada, go to: https://cahss.ca/cahss-networks/equine and enter the equine dashboard.;

Strangles

Simcoe County, ON

Alert ID: 2024-44

September 16, 2024

Source: OMAFA

Number Confirmed: 1;
Number Exposed: Unknown;
Facility Type: Private Facility;

Horse 1:
Age: 13; Gender: Gelding; Breed: Draft-cross; Clinical Signs: This horse was admitted to a referral hospital with a fever of unknown origin and mucopurulent nasal discharge. Samples from the upper respiratory tract were positive for S. equi.; Horse Status: Recovering;

Comments: To see past and present Strangles cases in Ontario go to: https://www.oahn.ca/resources/ontario-equine-disease-alerts/ and enter the disease surveillance portal.;

For more information, visit:

Equine Strangles Resources

Strangles

Oxford County, ON

Alert ID: 2024-43

September 16, 2024

Source: OMAFA

Number Confirmed: 1;
Number Exposed: 1;
Facility Type: Farm;

Horse 1:
Age: 20; Gender: Mare; Breed: Belgian; Onset of Clinical Signs: 9/9/2024; Clinical Signs: This mare developed an abscess on the side of her head about a month after the arrival of a new horse. The abscess was positive for S. equi on PCR testing.; Horse Status: Recovering;

Comments: To see past and present Strangles cases in Ontario go to: https://www.oahn.ca/resources/ontario-equine-disease-alerts/ and enter the disease surveillance portal.;

For more information, visit:

Equine Strangles Resources

West Nile Virus

District of Sudbury, ON

Alert ID: 2024-42

September 16, 2024

Source: OMAFA

Number Confirmed: 1;
Number Exposed: Unknown;

Horse 1:
Age: 21; Gender: Gelding; Clinical Signs: This gelding had been lethargic for a few days prior to developing a fever, ataxia and head tremors around Sept 1. Supporting treatment was provided but the horse was euthanized due to worsening neurologic signs.; Confirmation Date: 9/12/2024; Horse Status: Euthanized; Vaccination Status: Unvaccinated;

Eastern Equine Encephalitis

Hastings County, ON

Alert ID: 2024-41

September 16, 2024

Source: OMAFA

Number Confirmed: 1;
Number Exposed: 3;

Horse 1:
Age: 8; Gender: Mare; Onset of Clinical Signs: 9/2/2024; Clinical Signs: This mare was found down and unable to get up, blind and severely depressed. It was euthanized. Serum EEE IgM was positive.; Confirmation Date: 9/12/2024; Horse Status: Euthanized; Vaccination Status: Unvaccinated;

Comments: To see past and present EEE cases in Ontario go to: https://www.oahn.ca/resources/ontario-equine-disease-alerts/ and enter the disease surveillance portal. To see past and present EEE cases in Canada, go to: https://cahss.ca/cahss-networks/equine and enter the equine dashboard.;

Eastern Equine Encephalitis

Regional Municipality of Niagara, ON

Alert ID: 2024-40

September 11, 2024

Source: OMAFA

Number Confirmed: 1;
Number Exposed: Unknown;

Horse 1:
Age: 4; Gender: Gelding; Onset of Clinical Signs: 9/6/2024; Clinical Signs: This unvaccinated 4 year old gelding was referred to an equine hospital for evaluation of neurologic/gastrointestinal disease. He arrived down in the trailer and when assisted to stand was leaning to the left side for support and had an abnormal cranial nerve exam. Despite supportive treatment his condition rapidly deteriorated that day and he was euthanized.; Horse Status: Euthanized; Vaccination Status: Unvaccinated;

Strangles

Wellington County, ON

Alert ID: 2024-39

September 11, 2024

Source: OMAFA

Number Confirmed: 3;
Number Exposed: 2;
Facility Type: Boarding Facility;

Horse 1:
Clinical Signs: These horses were showing classic signs of Strangles, beginning around September 2, and tested positive on PCR testing.;

Comments: The facility manager has voluntarily stopped movement of horses on and off the property and is working with their veterinarian on instituting biosecurity protocols. To see past and present Strangles cases in Ontario go to: https://www.oahn.ca/resources/ontario-equine-disease-alerts/ and enter the disease surveillance portal.;

For more information, visit:

Equine Strangles Resources

Strangles

Wellington County, ON

Alert ID: 2024-38

September 6, 2024

Source: OMAFA

Number Confirmed: 1;
Number Exposed: Unknown;
Facility Type: Farm;

Horse 1:
Age: 15; Gender: Mare; Breed: Standardbred; Onset of Clinical Signs: 8/29/2024; Clinical Signs: This mare developed a fever and swelling in the throat region. Swab was positive for S. equi on PCR.; Horse Status: Recovering;

Comments: To see past and present facilities affected by Strangles in Ontario go to: https://www.oahn.ca/resources/ontario-equine-disease-alerts/ and enter the disease surveillance portal.;

For more information, visit:

Equine Strangles Resources

Eastern Equine Encephalitis

United Counties of Leeds and Grenville, ON

Alert ID: 2024-37

September 3, 2024

Source: OMAFA

Number Confirmed: 1;
Number Exposed: Unknown;

Horse 1:
Age: 4; Breed: Donkey; Onset of Clinical Signs: 8/10/2024; Clinical Signs: This Jenny was normal on the morning of Aug 10 but then became recumbent, dull, unresponsive with increased heart and respiratory rates. Supportive treatment was attempted but she was euthanized later that day.; Horse Status: Euthanized; Vaccination Status: Unvaccinated;

West Nile Virus

United Counties of Prescott and Russell, ON

Alert ID: 2024-36

September 3, 2024

Source: OMAFA

Number Confirmed: 1;
Number Exposed: Unknown;

Horse 1:
Age: 5; Gender: Gelding; Onset of Clinical Signs: 8/14/2024; Clinical Signs: This gelding was noticed to be off by the owner on August 14 and became recumbent the following morning, preferring to stay in lateral recumbency. He was euthanized.; Confirmation Date: 8/29/2024; Horse Status: Euthanized; Vaccination Status: Unvaccinated;

Eastern Equine Encephalitis

United Counties of Leeds and Grenville, ON

Alert ID: 2024-35

September 3, 2024

Source: OMAFA

Number Confirmed: 1;
Number Exposed: Unknown;

Horse 1:
Age: 18; Gender: Mare; Breed: Quarter Horse (QH); Onset of Clinical Signs: 8/22/2024; Clinical Signs: This mare was found down on August 22 and unable to rise. It became unresponsive and died.; Confirmation Date: 8/30/2024; Horse Status: Deceased; Vaccination Status: Unvaccinated;

Eastern Equine Encephalitis

City of Ottawa (Ottawa Region), ON

Alert ID: 2024-34

September 3, 2024

Source: OMAFA

Number Confirmed: 1;
Number Exposed: Unknown;

Horse 1:
Age: 15; Gender: Gelding; Breed: Thoroughbred (TB); Onset of Clinical Signs: 8/23/2024; Clinical Signs: This gelding was ataxic when it was brought in from the field, was dull and would hang its head down in the corner of the stall. He became recumbent overnight and developed nystagmus in the morning. He was euthanized.; Confirmation Date: 8/30/2024; Horse Status: Euthanized; Vaccination Status: Unvaccinated;

West Nile Virus

Simcoe County, ON

Alert ID: 2024-33

September 3, 2024

Source: OMAFA

Number Confirmed: 1;
Number Exposed: Unknown;

Horse 1:
Age: 7; Gender: Stallion; Breed: Appaloosa; Onset of Clinical Signs: 8/11/2024; Clinical Signs: Ataxia was noticed by the owner on August 11. Horse is recovering.; Confirmation Date: 8/24/2024; Horse Status: Recovering; Vaccination Status: Unvaccinated;

Strangles

City of Ottawa, ON

Alert ID: 2024-32

September 3, 2024

Source: OMAFA

Number Confirmed: 1;
Number Suspected: 2;
Number Exposed: Unknown;

Horse 1:
Age: 6; Gender: Mare; Breed: Pony; Clinical Signs: Significant submandibular and retropharyngeal lymph node abscessation back in July but was not tested. The affected animals were quarantined at a separate facility nearby. Clinical signs have resolved and this test was to see if the pony had cleared the infection.;

Comments: To see past and present Strangles cases in Ontario go to: https://www.oahn.ca/resources/ontario-equine-disease-alerts/ and enter the disease surveillance portal.;

For more information, visit:

Equine Strangles Resources

Eastern Equine Encephalitis

District of Parry Sound, ON

Alert ID: 2024-31

September 3, 2024

Source: OMAFA

Number Confirmed: 1;
Number Exposed: Unknown;

Horse 1:
Age: 3; Gender: Colt; Breed: Miniature Horse; Clinical Signs: This horse became recumbent quickly after displaying neurologic signs. He had an increased heart rate and slow capillary refill time. He was euthanized.; Vaccination Status: Unvaccinated;

Strangles

United Counties of Leeds and Grenville, ON

Alert ID: 2024-30

September 3, 2024

Number Confirmed: 1;
Number Exposed: Unknown;

Horse 1:
Age: 13; Gender: Mare; Breed: Paint; Clinical Signs: This mare was bought from an auction and that same day was examined by a veterinarian for enlarged submandibular lymph nodes and nasal discharge. The mare was immediately isolated at a separate facility.;

Comments: To see past and present Strangles cases in Ontario go to: https://www.oahn.ca/resources/ontario-equine-disease-alerts/ and enter the disease surveillance portal.;

For more information, visit:

Equine Strangles Resources

Eastern Equine Encephalitis

Lanark County, ON

Alert ID: 2024-29

August 26, 2024

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Exposed: Unknown;

Horse 1:
Age: 2; Gender: Filly; Breed: Quarter Horse (QH); Clinical Signs: This filly was found down on August 14 by the owners. When they got her up she leant against a wall. She was also febrile (103F). She was euthanized . Serum IgM was positive for EEE.; Horse Status: Euthanized; Vaccination Status: Undervaccinated;

West Nile Virus

Norfolk County, ON

Alert ID: 2024-28

August 21, 2024

Number Confirmed: 1;
Number Exposed: Unknown;

Horse 1:
Age: 11; Gender: Mare; Breed: Standardbred; Usage: Pleasure Riding; Onset of Clinical Signs: 8/13/2024; Clinical Signs: This mare was examined for fever (104.5 F), muscle fasciculations, ataxia, knuckling, and unusual aggression. She was treated supportively but became recumbent on August 17 and was euthanized.; Horse Status: Euthanized; Vaccination Status: Unvaccinated;

Notes:

Eastern Equine Encephalitis

United Counties of Leeds and Grenville, ON

Alert ID: 2024-27

August 20, 2024

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Suspected: 1;
Number Euthanized: 2;

Horse 1:
Age: 25; Gender: Mare; Onset of Clinical Signs: 8/6/2024; Clinical Signs: Found acutely down on the evening of August 6. Supportive treatment was provided but the mare was euthanized two days later. The mare’s pasture-mate was euthanized on August 3 after being found down in the field. It was not tested.; Confirmation Date: 8/19/2024; Horse Status: Euthanized; Vaccination Status: Unvaccinated;

Eastern Equine Encephalitis

United Counties of Leeds and Grenville, ON

Alert ID: 2024-26

August 19, 2024

Number Confirmed: 1;
Number Exposed: Unknown;

Horse 1:
Age: 3; Gender: Gelding; Breed: Percheron; Onset of Clinical Signs: 8/6/2024; Clinical Signs: Inappetence and fever (41.7 C) on the evening of Aug 6. Despite supportive treatment the gelding became sleepy, leaning on the stall wall, reluctant to move and head pressing the next morning. He quickly became recumbent and unresponsive to normal stimuli and was euthanized later that day.; Confirmation Date: 8/17/2024; Horse Status: Euthanized; Vaccination Status: Unvaccinated;

Eastern Equine Encephalitis

Lanark County, ON

Alert ID: 2024-25

August 19, 2024

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Exposed: Unknown;

Horse 1:
Age: 1; Gender: Filly; Breed: Belgian; Onset of Clinical Signs: 8/9/2024; Clinical Signs: Fever, ataxia; Confirmation Date: 8/17/2024; Horse Status: Deceased;

Eastern Equine Encephalitis

City of Ottawa, ON

Alert ID: 2024-24

August 16, 2024

Number Confirmed: 1;
Number Exposed: Unknown;

Horse 1:
Age: Suckling Foal; Gender: Filly; Onset of Clinical Signs: 7/25/2024; Clinical Signs: This 4 month old filly was found down on July 25 , and despite treatment was unable to rise. She progressed to seizuring and died.; Confirmation Date: 8/12/2024; Horse Status: Deceased;

Eastern Equine Encephalitis

United Counties of Prescott and Russell, ON

Alert ID: 2024-23

August 15, 2024

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Exposed: Unknown;

Horse 1:
Age: 12; Gender: Mare; Breed: Quarter Horse (QH); Onset of Clinical Signs: 7/29/2024; Clinical Signs: This mare was clinically normal the night before and found down in the morning and seizuring. Serum EEE IgM was positive. The veterinarian reported 4 other horses in his practice area similarly affected but not tested.; Horse Status: Deceased; Vaccination Status: Unvaccinated;

Eastern Equine Encephalitis

United Counties of Leeds and Grenville, ON

Alert ID: 2024-22

August 15, 2024

Number Confirmed: 1;
Number Exposed: Unknown;

Horse 1:
Age: Yearling; Gender: Filly; Breed: Quarter Horse (QH); Clinical Signs: This filly was clinically normal on the morning of Aug 12 but by evening was lethargic and ataxic with progressive neurologic signs. She had received her initial EEE vaccination and booster in May 2024.; Confirmation Date: 8/15/2024; Horse Status: Deceased;

Eastern Equine Encephalitis

Lanark County, ON

Alert ID: 2024-21

August 15, 2024

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Suspected: 1;
Number Exposed: 50;

Horse 1:
Age: Yearling; Gender: Filly; Breed: Quarter Horse (QH); Clinical Signs: This filly had been clinically normal, became recumbent and then developed seizures prior to being euthanized. She had her first vaccination and booster in May 2024.; Confirmation Date: 8/14/2024; Horse Status: Euthanized;

Eastern Equine Encephalitis

United Counties of Leeds and Grenville, ON

Alert ID: 2024-20

August 12, 2024

Number Confirmed: 1;
Number Exposed: 8;
Facility Type: Private Facility;

Horse 1:
Age: Suckling Foal; Gender: Filly; Onset of Clinical Signs: 8/1/2024; Clinical Signs: This 2 to 3 month old filly showed acute and progressive neurologic signs on Aug 1 and was euthanized on Aug 2. Serum EEE IgM was positive.; Horse Status: Euthanized; Vaccination Status: Unvaccinated;

Eastern Equine Encephalitis

Lanark County, ON

Alert ID: 2024-19

July 30, 2024

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Exposed: Unknown;

Horse 1:
Gender: Mare; Breed: Quarter Horse (QH); Clinical Signs: This adult mare was euthanized due to progressive neurologic signs (ataxia). The owner reported a fever of 104F. The mare was positive on EEE IgM ELISA.; Vaccination Status: Undervaccinated;

Comments: To see present and previous EEE cases in Ontario go to: https://www.oahn.ca/resources/ontario-equine-disease-alerts/ and enter the disease surveillance portal. To see past and present EEE cases in Canada, go to: https://cahss.ca/cahss-networks/equine and enter the equine dashboard;

Equine Influenza

Simcoe County, ON

Alert ID: 2024-18

July 3, 2024

Number Confirmed: 1;
Number Suspected: Unknown;
Number Exposed: Unknown;
Facility Type: Boarding Facility;

Horse 1:
Age: 5; Gender: Mare; Breed: Quarter Horse (QH); Clinical Signs: This mare is one of several horses displaying signs of respiratory disease in the barn which range from fever, nasal discharge, mildly swollen lymph nodes and occasional cough. Horses returned from a competition a few days before the index case (a gelding) was examined for nasal discharge and slightly enlarged lymph nodes. S. equi testing was negative in the index case and the influenza-positive mare. Within the next 48-72 hours several of the horses in the barn developed similar respiratory signs. Some of the horses are vaccinated for influenza and have more mild signs.; Confirmation Date: 6/26/2024;

Comments: The facility manager is working with their veterinarian and has implemented voluntary animal movement restrictions and infection control procedures.;

Strangles

Regional Municipality of Waterloo, ON

Alert ID: 2024-17

June 24, 2024

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Exposed: 2;

Horse 1:
Age: 11; Gender: Gelding; Breed: Haflinger; Clinical Signs: This gelding was purchased along with 2 other horses at an auction on June 8 in Grey County. The horses were brought home and immediately isolated. A few days later the gelding developed a thick nasal discharge and some sinus swelling. PCR testing of the nasal discharge was positive for S. equi. The other two horses are being monitored for fever/clinical signs.;

Comments: The facility owner is working with their veterinarian to continue animal movement restrictions and implement infection control procedures.;

For more information, visit:

Equine Strangles Resources

Strangles

United Counties of Prescott and Russell, ON

Alert ID: 2024-16

June 12, 2024

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Exposed: 2;
Facility Type: Private Facility;

Horse 1:
Age: Yearling; Gender: Filly; Breed: Standardbred; Clinical Signs: This filly develop parotid, submandibular and peri-rectal abscesses that were confirmed positive for S. equi. This filly arrived from another Ontario farm in November 2023.; Confirmation Date: 6/6/2024;

Comments: The farm owner is working with their veterinarian on voluntary movement restrictions and infection control measures.;

For more information, visit:

Equine Strangles Resources

Strangles

Peterborough County, ON

Alert ID: 2024-15

June 12, 2024

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 5;
Number Exposed: Unknown;
Facility Type: Private Facility;
Comments: The farm owner is working with their veterinarian to voluntarily restrict movement and implement infection control measures.;

For more information, visit:

Equine Strangles Resources

Strangles

City of Kawartha Lakes, ON

Alert ID: 2024-14

April 30, 2024

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Suspected: 3;
Number Exposed: Unknown;

Horse 1:
Gender: Mare; Clinical Signs: This mare was examined for signs of nasal discharge and an unrelenting fever on April 23.;

Comments: Under veterinary supervision, the farm owner has voluntarily restricted animal movement and implemented infection control procedures.;

For more information, visit:

Equine Strangles Resources

Strangles

Wellington County, ON

Alert ID: 2024-13
April 15, 2024

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Suspected: 3;
Number Exposed: Unknown;
Facility Type: Boarding Facility;

Horse 1:
Age: 10; Gender: Gelding; Breed: Thoroughbred (TB); Clinical Signs: This gelding developed a draining submandibular lymph node and nasal discharge. Discharges were positive for S. equi on PCR.;

Comments: The facility manager is working with their veterinarian on voluntary animal movement restrictions and infection control procedures.;

For more information, visit:

Equine Strangles Resources

Strangles

City of Kawartha Lakes, ON

Alert ID: 2024-12

March 27, 2024

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Exposed: 5;
Facility Type: Boarding Facility;

Horse 1:
Age: 7; Gender: Gelding; Onset of Clinical Signs: 3/21/2024; Clinical Signs: Unilateral submandibular lymph node abscess.; Confirmation Date: 3/25/2024; Horse Status: Recovering;

Comments: Under veterinary supervision, the facility owner has implemented voluntary animal movement restrictions and infection control procedures.;

For more information, visit:

Equine Strangles Resources

Equine Herpesvirus- Neurologic

Middlesex County, ON

Alert ID: 2024-11
March 5, 2024

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Exposed: 9;

Horse 1:
Age: 2; Gender: Colt; Breed: Standardbred; Onset of Clinical Signs: 2/29/2024; Clinical Signs: This colt developed a fever (105 F) on Feb 29 and was admitted to a referral hospital on March 3 with mild ataxia and bladder paralysis. A nasal swab was positive for EHV-1 by PCR.; Confirmation Date: 3/4/2024; Horse Status: Recovering;

Comments: A veterinarian is working with those involved to implement biosecurity procedures.

For more information, visit:

Strangles

Wellington, ON

Alert ID: 2024-10

February 29, 2024

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 2;
Number Suspected: Unknown;
Number Exposed: Unknown;
Facility Type: Farm;

Horse 1:
Gender: Mare; Breed: Standardbred; Onset of Clinical Signs: 2/23/2024; Clinical Signs: Two broodmares on a private farm developed signs of Strangles (fever, nasal discharge, enlarged lymph nodes) after comingling with horses from other farms. Samples were positive for S. equi by bacterial culture.; Confirmation Date: 2/27/2024;

Comments: The owner is working with their veterinarian to control the outbreak.;

For more information, visit:

Equine Strangles Resources

Equine Herpesvirus- Neurologic

Grey County, ON

Alert ID: 2024-09
February 21, 2024

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Suspected: 4;
Number Exposed: Unknown;
Number Euthanized: 3;
Facility Type: Farm;

Horse 1:
Age: 4; Gender: Mare; Breed: Warmblood (WB); Usage: Breeding; Onset of Clinical Signs: 2/17/2024; Clinical Signs: This pregnant mare was admitted to a referral hospital for treatment of acute neurologic signs (4/5 ataxia, head tilt and cranial nerve deficits). Nasal swab and blood samples were positive fore EHV-1 by PCR.; Confirmation Date: 2/21/2024; Horse Status: Recovering;

Comments: The farm owner is working with their veterinarian to implement voluntary animal movement restrictions and infection control measures. This mare was one of 23 horses bought at a sale in Illinois at the beginning of February. The horses were transported to a holding facility in Indiana prior to shipping to Ontario and delivered to farms in Grey County and surrounding areas. So far, the 5 confirmed/suspect horses were horses that arrived on these trailers. Veterinarians in the area are working with owners to manage the outbreak.;

For more information, visit:

Strangles

Regional Municipality of York, ON

Alert ID: 2024-08

February 08, 2024

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Exposed: Unknown;
Facility Type: Boarding Facility;

Horse 1:
Age: 12; Breed: Quarter Horse (QH); Clinical Signs: The horse developed a cough, unilateral nasal discharge, swollen lymph nodes and a fever. He was tested on January 31 and was positive for S. equi by PCR on nasal swab. The horse had shipped up from the US the previous week.; Confirmation Date: 2/2/2024;

Comments: Under veterinary supervision, the facility manager has implemented voluntary animal movement restrictions and infection control procedures.

For more information, visit:

Equine Strangles Resources

Strangles

Grey County, ON

Alert ID: 2024-07
February 05, 2024

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Exposed: Unknown;
Facility Type: Boarding Facility;

Horse 1:
Age: 12; Gender: Mare; Breed: Quarter Horse (QH); Onset of Clinical Signs: 1/29/2024; Clinical Signs: This mare had a fever and nasal discharge. She was tested on January 29 and the sample was positive for S. equi on PCR. She had attended an event on January 28. The owner was advised by their veterinarian to inform the event organizer so this information could be disseminated to the event participants.; Confirmation Date: 2/2/2024;

Comments: Under veterinary supervision, the facility owner has implemented voluntary animal movement restrictions and infection control procedures.;

For more information, visit:

Equine Strangles Resources

Equine Herpesvirus- Neurologic

Simcoe County, ON

Alert ID: 2024-06

February 02, 2024

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Suspected: Unknown;
Number Exposed: Unknown;
Facility Type: Boarding Facility;

Horse 1:
Age: 5; Gender: Gelding; Onset of Clinical Signs: 1/28/2024; Clinical Signs: Several horses at this facility have had fever, swollen legs and lethargy, with the latter lasting for about 4-5 days before recovery takes place. This particular gelding was the only horse tested and testing occurred after many of the horses had recovered. This gelding had extreme lethargy and was dragging its hind hooves. It was possibly very mildly ataxic on neurologic testing. A nasal swab taken from this gelding was positive for EHV-1 on PCR.; Horse Status: Recovering;

Comments: Two horses from the facility, that were not showing any clinical signs, attended a performance clinic before the results for this gelding were received. No direct contact was reported to have occurred between these horses and other horses at the clinic. This is the time of year when many different performance clinics for various disciplines are taking place. Horse owners are reminded to observe biosecurity protocols both when away at other facilities and at home, and to monitor their horses for general signs of “sickness” such as fever, lethargy, abnormal nasal discharge, ataxia, swollen limbs or lymph nodes. Horse owners should contact their veterinarian if they occur. This facility has implemented voluntary animal movement restrictions and is under veterinary supervision.;

For more information, visit:

Equine Influenza

Brant County, ON

Alert ID: 2024-05
February 01, 2024

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Suspected: 3;
Number Exposed: 18;
Facility Type: Boarding Facility;

Horse 1:
Age: 17; Gender: Gelding; Breed: Quarter Horse (QH); Onset of Clinical Signs: 1/27/2024; Clinical Signs: This gelding developed a fever, nasal discharge and a cough. Two other horses had transient fevers and 1 began coughing and developed a fever and nasal discharge. A nasal swab was positive for equine influenza on PCR.; Confirmation Date: 2/1/2024; Horse Status: Recovering;

Comments: The farm manager, working with their veterinarian, has implemented voluntary movement restrictions and infection control procedures.;

Strangles

Regional Municipality of Halton, ON

Alert ID: 2024-04

February 01, 2024

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Exposed: 5;
Facility Type: Boarding Facility;

Horse 1:
Age: 8; Gender: Gelding; Breed: Thoroughbred (TB); Clinical Signs: This gelding has a unilateral white, mucoid nasal discharge and is being evaluated for suspected chronic sinusitis. A nasopharyngeal lavage was positive for S. equi on PCR.; Confirmation Date: 1/29/2024; Vaccination Status: Vaccinated;

Comments: The farm manager, working with their veterinarian, has implemented voluntary movement restrictions and infection control procedures.;

For more information, visit:

Equine Strangles Resources

Strangles

Grey County, ON

Alert ID: 2024-03
January 25, 2024
Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Suspected: 8;
Facility Type: Private Facility;

Horse 1:
Age: 2; Gender: Filly; Breed: Mixed breed; Onset of Clinical Signs: 1/25/2024; Clinical Signs: This filly developed a fever (40.9 C), purulent nasal discharge and enlarged submandibular lymph nodes. The other horses in the barn were recovering from similar signs.; Confirmation Date: 1/26/2024; Horse Status: Recovering;

Comments: The farm is under voluntary movement restrictions and the owner has implemented infection control procedures. The farm is under veterinary supervision.;

For more information, visit:

Equine Strangles Resources

Strangles

City of Hamilton, ON

Alert ID: 2024-02

January 31, 2024

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Exposed: 6;
Facility Type: Private Facility;

Horse 1:
Age: 10; Gender: Gelding; Breed: Warmblood (WB); Onset of Clinical Signs: 1/23/2024; Clinical Signs: This gelding arrived on the property about 14 days prior to the development of clinical signs. Two draining abscesses were noted on the head along with some abrasions. A sample of the draining fluid was positive for S. equi on PCR.; Confirmation Date: 1/25/2024;

Comments: The farm owner, working with their veterinarian, has implemented voluntary animal movement restrictions and infection control procedures.;

For more information, visit:

Equine Strangles Resources

Strangles

Regional Municipality of Waterloo, ON

Alert ID: 2024-01
January 25, 2024
Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Exposed: 2;
Facility Type: Boarding Facility;

Horse 1:
Age: 14; Gender: Gelding; Onset of Clinical Signs: 1/16/2024; Clinical Signs: On January 16 a firm swelling was noticed under the left jaw and was confirmed to be a swollen left submandibular lymph node on January 18. The horse also had bilateral nasal discharge.; Confirmation Date: 1/19/2024; Horse Status: Recovering;

Comments: The facility manager has implemented voluntary movement restrictions and biosecurity protocols under supervision of their veterinarian.;

For more information, visit:

Equine Strangles Resources

Strangles

County of Frontenac, ON

Alert ID: 2023-44

December 21, 2023

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Suspected: Unknown;
Number Exposed: Unknown;
Facility Type: Boarding Facility;

Horse 1:
Age: 14; Gender: Gelding; Breed: Mixed breed; Onset of Clinical Signs: 12/15/2023; Clinical Signs: This gelding was diagnosed with purpura hemorrhagica, an immune-mediated vascular disease, often associated with exposure to S. equi antigens. S. equi was cultured from the guttural pouches. There were some horses on the property with nasal discharge within the last month.; Horse Status: Recovering;

Comments: Voluntary animal movement restrictions are being implemented and the farm is under veterinary supervision.;

For more information, visit:

Equine Strangles Resources

Equine Herpesvirus- Neurologic

Regional Municipality of York, ON

Alert ID: 2023-43
December 21, 2023
Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Exposed: Unknown;
Facility Type: Boarding Facility;

Horse 1:
Age: 20; Gender: Mare; Onset of Clinical Signs: 12/16/2023; Clinical Signs: This mare developed ataxia and dysuria on Dec 16 and is now recovering.; Horse Status: Recovering;

Comments: The facility owner has implemented voluntary animal movement restrictions and biosecurity measures under veterinary supervision. This is the 8th facility in Ontario to have a horse diagnosed with EHV-1 neurologic disease this year.;

Strangles

City of Toronto, ON

Alert ID: 2023-42

December 4, 2023

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 5;
Number Exposed: Unknown;

Horse 1:
Age: 24; Gender: Mare; Onset of Clinical Signs: 11/30/2023; Clinical Signs: This mare developed submandibular abscesses and two others developed a fever. These three horses plus two more close contacts are positive for S. equi on PCR.; Confirmation Date: 12/2/2023; Horse Status: Recovering;

Comments: The facility owner has implemented voluntary movement restrictions and biosecurity protocols under veterinary supervision.;

For more information, visit:

Equine Strangles Resources

Strangles

Grey County, ON

Alert ID: 2023-41
December 04, 2023
Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Exposed: Unknown;
Facility Type: Private Facility;

Horse 1:
Age: 8; Breed: Standardbred; Onset of Clinical Signs: 11/23/2023; Clinical Signs: Fever and Nasal discharge.; Confirmation Date: 11/24/2023; Horse Status: Recovering;

Comments: The farm owner has implemented voluntary movement restrictions and biosecurity protocols under veterinary supervision.;

Resources:

Equine Strangles Resources

Equine Influenza

Regional Municipality of Durham, ON

Alert ID: 2023-40

December 1, 2023

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Suspected: Unknown;
Number Exposed: Unknown;
Facility Type: Boarding Facility;

Horse 1:
Age: 3; Gender: Filly; Onset of Clinical Signs: 11/19/2023; Clinical Signs: This filly developed a persistent deep cough with significant mucopurulent nasal discharge and low grade fever (38.7 C). Several horses at the barn have had clinical signs consistent with a viral respiratory infection.; Confirmation Date: 11/28/2023; Horse Status: Recovering;

Comments: The filly is recovering under veterinary care.

Equine Herpesvirus- Neurologic

Regional Municipality of York, ON

Alert ID: 2023-39
November 23, 2023
Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Suspected: 1;
Number Exposed: 1;
Facility Type: Private Facility;

Horse 1:
Breed: Pony; Onset of Clinical Signs: 11/20/2023; Clinical Signs: This pony was euthanized on November 20 with acute neurologic signs (ataxia that progressed with significant vestibular signs). Two weeks prior a mare on the property had been treated for a recurrent fever.; Confirmation Date: 11/21/2023; Horse Status: Euthanized;

Comments: The farm owner is implementing voluntary movement restrictions as well as biosecurity measures under veterinary supervision.;

Resources:

Strangles

Regional Municipality of Halton, ON

Alert ID: 2023-38

November 22, 2023

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Exposed: 2;
Horse 1:
Age: 3; Gender: Filly; Breed: Pony; Clinical Signs: This pony filly was purchased from an auction and was noticed to have mucopurulent nasal discharge. Fortunately, she went into a quarantine area immediately upon arrival at the farm along with two other ponies.; Confirmation Date: 11/14/2023;

Comments: The facility owner has implemented voluntary movement restrictions as well as instituted biosecurity measures under the supervision of the attending veterinarian.;

For more information, visit:

Equine Herpesvirus- Neurologic

Oxford County, ON

Alert ID: 2023-37

November 17, 2023

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Suspected: 1;
Number Exposed: Unknown;
Number Euthanized: 1;
Facility Type: Boarding Facility;

Horse 1:
Age: 16; Gender: Mare; Breed: Thoroughbred (TB); Onset of Clinical Signs: 11/13/2023; Clinical Signs: The mare developed acute neurologic signs (leaning on walls, ataxia) on November 13, 2023 which progressed to recumbency with nystagmus on November 14. She was euthanized on November 14. A nasal swab was positive for EHV-1 PCR.; Confirmation Date: 11/15/2023; Horse Status: Euthanized;

Comments: The facility owner, working with their veterinarian, has instituted voluntary movement restrictions and biosecurity protocols.;

Resources:

Strangles

Bruce County, ON

Alert ID: 2023-36

November 3, 2023

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 2;
Number Suspected: 1;
Number Exposed: 6;

Horse 1:
Clinical Signs: Three horses have developed nasal discharge and 2 of the 3 have submandibular lymph node enlargement. Two horses tested positive for S. equi on bacterial culture.; Confirmation Date: 10/27/2023;

Comments: The facility has implemented voluntary movement restrictions under veterinary supervision.;

Strangles

Regional Municipality of Halton, ON

Alert ID: 2023-35

November 3, 2023

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 2;
Number Suspected: 1;
Number Exposed: Unknown;

Horse 1:
Age: 19; Gender: Gelding; Breed: Warmblood (WB); Clinical Signs: This gelding developed a unilateral nasal discharge around October 14 and was confirmed positive for S. equi on October 25 by PCR. The pasture mate, who was not showing clinical signs, was also positive for S. equi. A third horse has developed submandibular lymph node abscessation. All 3 horses are in isolation on the property.; Confirmation Date: 11/25/2023; Horse Status: Recovering;

Comments: The facility is under voluntary movement restrictions and the owner has instituted infection control measures. The situation is under veterinary supervision.;

For more information, visit:

Eastern Equine Encephalitis

Peterborough County, ON

Alert ID: 2023-34

October 31, 2023

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Exposed: Unknown;
Number Euthanized: 1;

Horse 1:
Age: 17; Gender: Mare; Onset of Clinical Signs: 10/16/2023; Clinical Signs: This mare was found down on October 16. She had no fever, nor cranial nerve deficits but was starting to lose deep pain sensation. She was euthanized that day.; Confirmation Date: 10/30/2023; Horse Status: Euthanized; Vaccination Status: Unvaccinated;

Comments: This is the 18th confirmed case of equine EEE in Ontario this year.;

Strangles

Bruce County, ON

Alert ID: 2023-33

October 31, 2023

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Suspected: 1;
Number Exposed: Unknown;

Horse 1:
Gender: Mare; Breed: Mixed breed; Onset of Clinical Signs: 10/21/2023; Clinical Signs: This mare developed a high fever with mucopurulent nasal discharge.; Confirmation Date: 10/26/2023; Horse Status: Recovering;

For more information, visit:

Strangles

City of Kawartha Lakes, ON

Alert ID: 2023-32

October 31, 2023

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Suspected: 2;
Number Exposed: Unknown;

Horse 1:
Age: Weanling; Gender: Colt; Breed: Standardbred; Clinical Signs: Submandibular lymph node abscessation.; Confirmation Date: 10/26/2023;

For more information, visit:

West Nile Virus

Hastings County, ON

Alert ID: 2023-31

October 24, 2023

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Exposed: Unknown;
Facility Type: Private Facility;

Horse 1:
Age: 12; Gender: Mare; Breed: Belgian; Onset of Clinical Signs: 10/7/2023;
Clinical Signs: This mare was found down on October 7. When she was assisted to rise, she was ataxic with nystagmus and hypersalivation. She was provided with supportive treatment and is recovering.; Confirmation Date: 10/17/2023; Horse Status: Recovering; Vaccination Status: Unvaccinated;

Comments: This is the 6th confirmed case of equine West Nile virus infection in Ontario this year.;

Notes:

Eastern Equine Encephalitis

United Counties of Leeds and Grenville, ON

Alert ID: 2023-30

October 26, 2023

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Exposed: Unknown;
Facility Type: Farm;

Horse 1:
Gender: Gelding; Breed: Belgian; Onset of Clinical Signs: 10/2/2023; Clinical Signs: This gelding was found to be inappetent, dull, ataxic and staggering on October 2.; Confirmation Date: 10/16/2023; Horse Status: Deceased; Vaccination Status: Unvaccinated; Comments: This is the 17th confirmed equine case of eastern equine encephalitis in Ontario this year.;

Eastern Equine Encephalitis

Peterborough County, ON

Alert ID: 2023-29

October 17, 2023

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Exposed: Unknown;
Facility Type: Private Facility;
Age: 13; Gender: Mare; Breed: Quarter Horse (QH); Onset of Clinical Signs: 9/29/2023;
Clinical Signs: This mare was referred to an equine hospital with dull mentation and inappetence. She was difficult to move and began stumbling. She arrived at the hospital down in the trailer and was euthanized the following day.; Confirmation Date: 10/16/2023; Horse Status: Euthanized; Vaccination Status: Undervaccinated;
Comments: This was the 16th case of equine EEE in Ontario this year.;

Strangles

District of Sudbury, ON

Alert ID: 2023-28

October 11, 2023

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Exposed: Unknown;
Facility Type: Boarding Facility;
Age: 26; Gender: Gelding; Breed: Miniature Horse;
Clinical Signs: Large submandibular abscess.; Confirmation Date: 10/5/2023;
Comments: The facility is under veterinary supervision. Voluntary movement restrictions and biosecurity measures are being instituted.;

For more information, visit:

Equine Herpesvirus- Neurologic

Regional Municipality of Peel, ON

Alert ID: 2023-27

October 10, 2023

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Suspected: 2;
Number Exposed: Unknown;
Age: 11; Gender: Mare; Breed: Thoroughbred (TB); Onset of Clinical Signs: 9/28/2023;
Clinical Signs: This mare was the third mare to go down at the farm with varying degrees of neurologic disease. All three mares were euthanized. On postmortem examination of this mare, brain tissue was positive for EHV-1 by PCR and negative for EEE and WNV PCR.; Confirmation Date: 10/3/2023; Horse Status: Euthanized; Vaccination Status: Undervaccinated;
Comments: The facility owner has instituted voluntary movement restrictions and biosecurity protocols under veterinary supervision.

Resources:

Eastern Equine Encephalitis

Leeds and Grenville, ON

Alert ID: 2023-26

October 10, 2023

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Suspected: Unknown;
Number Exposed: Unknown;
Age: Yearling; Gender: Filly; Onset of Clinical Signs: 9/22/2023;
Clinical Signs: This was a 12 month old Canadian filly, with no record of vaccination, in the United Counties of Leeds and Grenville. On September 22 the owner observed the filly having trouble standing up and seizing. On examination that morning, the filly was in lateral recumbency, could not stand when prompted, appeared weak, had an elevated respiratory rate, and a fever (40C). She was euthanized by the vet at that time. She was observed to be normal by the owner the day prior (Sep 21). The serum sample was positive for EEE IgM. There was no history of travel. A foal and an adult horse died on the farm 1-2 weeks prior but were not tested for EEE.; Confirmation Date: 10/2/2023; Horse Status: Euthanized; Vaccination Status: Unvaccinated;
Comments: This is the 15th EEE case of the year in Ontario.;

Eastern Equine Encephalitis

City of Ottawa, ON

Alert ID: 2023-25

October 10, 2023

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Exposed: Unknown;
Age: 12; Gender: Gelding; Breed: Standardbred; Onset of Clinical Signs: 9/14/2023;
Clinical Signs: This was a 12 year old unvaccinated Standardbred gelding in the region of Ottawa that was found down during evening feeding on September 14th. On exam that evening he had a severe left head tilt, was leaning left, and would fall over to the left side when unsupported. He was also ataxic and had a fever (~40.0C) and was euthanized (Sept 14). He was observed to be normal at feeding that morning. The serum sample was positive for EEE IgM. There was no history of travel.; Confirmation Date: 10/3/2023; Horse Status: Euthanized; Vaccination Status: Unvaccinated;
Comments: This is the 14th EEE case of the year in Ontario.;

Eastern Equine Encephalitis

City of Ottawa, ON

Alert ID: 2023-24

October 10, 2023

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Suspected: 2;
Number Exposed: Unknown;
Age: Yearling; Gender: Mare; Breed: Quarter Horse (QH); Onset of Clinical Signs: 9/25/2023;
Clinical Signs: This was an unvaccinated 15 month old female QH from the region of Ottawa, that was found down in a pasture on September 25 and would stumble and fall when she tried to rise. She was euthanized about 6 hours later . The serum sample was positive for EEE IgM. There was no history of travel. Two unvaccinated weanlings on the property also showed acute neurologic signs and were euthanized.; Confirmation Date: 10/3/2023; Horse Status: Euthanized; Vaccination Status: Unvaccinated;
Comments: This is the 13th EEE case of the year.;

West Nile Virus

Simcoe County, ON

Alert ID: 2023-23

September 26, 2023

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Exposed: Unknown;
Facility Type: Private Facility;
Age: Yearling; Gender: Colt; Breed: Belgian; Onset of Clinical Signs: 9/13/2023;
Clinical Signs: This colt develop a fever (39 C) and acute neurologic signs (ataxic, weak, no menace in the left eye) on September 13.; Confirmation Date: 9/25/2023; Horse Status: Recovering; Vaccination Status: Unvaccinated;
Comments: This is the 5th confirmed equine WNV case of the year.;

Notes:

Eastern Equine Encephalitis

District of Muskoka, ON

Alert ID: 2023-22

September 26, 2023

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Exposed: Unknown;
Facility Type: Private Facility;
Age: 20; Gender: Mare; Breed: Quarter Horse (QH); Onset of Clinical Signs: 9/14/2023;
Clinical Signs: This was an unvaccinated 20 yo QH broodmare, nursing a 2 month old colt, that developed acute neurologic signs (blind, backing up) on September 14, and became recumbent and was euthanized on September 15th.; Confirmation Date: 9/25/2023; Horse Status: Euthanized; Vaccination Status: Unvaccinated;
Comments: This is the 12th confirmed equine EEE case of the year.;

Eastern Equine Encephalitis

City of Ottawa, ON

Alert ID: 2023-21

September 14, 2023

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 2; Number Suspected: 3; Number Exposed: Unknown; Facility Type: Private Facility; Age: 6; Gender: Mare; Breed: Draft; Onset of Clinical Signs: 9/2/2023;Clinical Signs: A second horse on the property has been confirmed with EEE.; Horse Status: Euthanized; Vaccination Status: Unvaccinated;

Eastern Equine Encephalitis

City of Ottawa, ON

Alert ID: 2023-20

September 12, 2023

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1; Number Suspected: 4; Number Exposed: Unknown; Facility Type: Private Facility; Age: 8; Gender: Mare; Breed: Draft; Onset of Clinical Signs: 9/4/2023;Clinical Signs: The mare developed acute neurologic signs (head pressing followed by recumbency) and was euthanized.; Confirmation Date: 9/11/2023; Horse Status: Euthanized; Vaccination Status: Unvaccinated;

Eastern Equine Encephalitis

Peterborough County, ON

Alert ID: 2023-19

September 5 2023

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1; Number Exposed: Unknown; Age: 15; Gender: Mare; Breed: Miniature Horse; Onset of Clinical Signs: 8/31/2023;Clinical Signs: The mare developed acute neurologic signs (acute collapse, unable to stand, thrashing, high temperature) on August 31 and was euthanized.; Confirmation Date: 9/2/2023; Horse Status: Euthanized; Vaccination Status: Unvaccinated;

Eastern Equine Encephalitis

City of Kawartha Lakes, ON

Alert ID: 2023-18

August 24, 2023

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Exposed: Unknown;
Age: Yearling; Gender: Filly; Onset of Clinical Signs: 8/18/2023;
Clinical Signs: This unvaccinated filly developed acute neurologic signs (ataxia, depression and slow menace) with clinical progression to recumbency, requiring euthanasia within 48 hours.; Confirmation Date: 8/23/2023; Horse Status: Euthanized; Vaccination Status: Unvaccinated;

West Nile Virus

Regional Municipality of Niagara, ON

Alert ID: 2023-17

August 23, 2023

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Exposed: Unknown;
Age: 2; Gender: Filly; Breed: Standardbred; Onset of Clinical Signs: 8/20/2023;
Clinical Signs: This filly was referred to an equine hospital with acute neurologic signs (grade IV ataxia, vestibular signs, whole body muscle fasciculations, strabismus in the right eye, hyperesthesia) which progressed to focal seizures, hypersalivation and recumbency. She was euthanized. Brain tissue was positive for WNV PCR. There was no history of travel.; Confirmation Date: 8/23/2023; Horse Status: Euthanized; Vaccination Status: Unvaccinated;

Notes:

- West Nile Virus info from Health Canada
- Infographics: Equine West Nile Virus

West Nile Virus

District of Thunder Bay, ON

Alert ID: 2023-16

August 22, 2023

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Exposed: 1;
Gender: Mare; Breed: Pony; Onset of Clinical Signs: 8/8/2023;
Clinical Signs: The mare developed neurologic signs (ataxia, flaccid tongue and mandible) on August 8 and was euthanized on August 10 due to clinical deterioration.; Confirmation Date: 8/22/2023; Horse Status: Euthanized; Vaccination Status: Unvaccinated;

Notes:

- West Nile Virus info from Health Canada
- Infographics: Equine West Nile Virus

Eastern Equine Encephalitis

Lanark County, ON

Alert ID: 2023-15

August 22, 2023

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Suspected: 1;
Number Exposed: Unknown;
Age: 14; Gender: Mare; Breed: Hackney Pony; Onset of Clinical Signs: 8/5/2023;
Clinical Signs: The mare developed neurologic signs (severe ataxia, asymmetrical hyperesthesia, weakness, poor tongue tone) on August 5. She was treated with NSAIDS then corticosteroids and has recovered. A foal on the property also showed neurologic signs for 48 hours and has also recovered.; Confirmation Date: 8/22/2023; Horse Status: Recovering; Vaccination Status: Unvaccinated;

West Nile Virus

City of Kawartha Lakes, ON

Alert ID: 2023-14

August 15, 2023

Confirmed Case(s) – No Quarantine

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Exposed: Unknown;
Age: 6; Gender: Mare;
Clinical Signs: The mare was found down with a high fever (41 C) and depressed. She died overnight.; Confirmation Date: 8/14/2023; Horse Status: Deceased; Vaccination Status: Unvaccinated;

Notes:

- West Nile Virus info from Health Canada
- Infographics: Equine West Nile Virus

Eastern Equine Encephalitis

City of Ottawa, ON

Alert ID: 2023-13

August 15, 2023

Confirmed Case(s) – No Quarantine

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Exposed: Unknown;
Age: Yearling; Gender: Colt; Breed: Warmblood (WB);
Clinical Signs: The colt developed acute neurologic signs (circling to the left, head pressing) with a low grade fever. He rapidly became recumbent with nystagmus and was euthanized.; Confirmation Date: 8/14/2023; Horse Status: Euthanized; Vaccination Status: Unvaccinated;

Eastern Equine Encephalitis

Lanark County, ON

Alert ID: 2023-12

August 11, 2023

Confirmed Case(s) – No Quarantine

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Exposed: Unknown;
Age: Yearling; Gender: Gelding; Breed: Standardbred; Onset of Clinical Signs: 8/2/2023;
Clinical Signs: On August 2, 2023, an unvaccinated yearling Standardbred gelding was found to be aimlessly wandering in the paddock unaware of his surroundings. He became acutely recumbent and was euthanized. There was no history of travel.; Confirmation Date: 8/9/2023; Horse Status: Euthanized; Vaccination Status: Unvaccinated;

Eastern Equine Encephalitis

Lanark County, ON

Alert ID: 2023-11

July 28, 2023

Confirmed Case(s) – Voluntary Quarantine

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1; Number Exposed: TBD; Age: 17 months;
Comments: On July 28, 2023, the Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA) was notified of a confirmed case of eastern equine encephalitis (EEE) in an unvaccinated 17-month old colt in Lanark County. The colt was euthanized after developing a fever (41⁰C) followed by recumbency and seizures. The colt had no history of travel. Laboratory diagnostic testing confirmed infection with the EEE virus (EEEV).

Link to veterinary advisory PDF:

Veterinary Advisory: One case of Eastern Equine Encephalitis in Lanark County

Strangles

Middlesex County, ON

Alert ID: 2023-10

June 28, 2023

Confirmed Case(s) – Voluntary Quarantine

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Exposed: 3;
Facility Type: Private Facility;
Age: 2; Gender: Gelding; Breed: Quarter Horse (QH); Onset of Clinical Signs: 6/13/2023;
Clinical Signs: The recently purchased gelding developed a fever and submandibular swelling. He had fortunately been isolated since arrival at the farm.; Confirmation Date: 6/15/2023;
Comments: The owner, under veterinary supervision, has instituted voluntary movement restrictions and biosecurity measures.

For more information, visit:

Strangles

Regional Municipality of Halton, ON

Alert ID: 2023-09

June 28, 2023

Confirmed Case(s) – Voluntary Quarantine

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1; Number Exposed: 10; Age: 9; Gender: Mare; Breed: Pony; Onset of Clinical Signs: 6/17/2023;
Clinical Signs: On the weekend of June 17, the pony developed a fever and submandibular swelling and was quickly isolated from other horses.; Horse Status: Isolated;
Comments: The farm manager, under veterinary supervision, has instituted voluntary movement restrictions and biosecurity measures.

For more information, visit:

Strangles

Hamilton Region, ON

Alert ID: 2023-08

April 13, 2023

Confirmed Case(s) – Voluntary Quarantine

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1 Number Exposed: Unknown Facility Type: Boarding Facility;Age: 18; Gender: Gelding; Breed: Standardbred

Clinical Signs: On April 8, the gelding developed a severely swollen head with nasal discharge, tachycardia, a swollen leg , had a draining pectoral wound and became recumbent. He was euthanized due to the severity of clinical signs. A swab taken from the nasal discharge was positive for Streptococcus equi subsp equi.

Comments: The facility owner is working with their veterinarian to implement biosecurity protocols and voluntary movement restrictions.

For more information, visit:

Strangles

Grey County, ON

Alert ID: 2023-07

March 30, 2023

Confirmed Case(s) – Voluntary Quarantine

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1; Number Exposed: 24; Age: 8; Gender: Gelding; Breed: Thoroughbred (TB); Clinical Signs: The gelding was examined on March 23, 2023 for the development of a fever and submandibular draining tract. The exudate was positive for S. equi by PCR. The horse has lived on the property for almost a year. There have been no new horses recently and no other horses are showing clinical signs.; Confirmation Date: 3/27/2023; Horse Status: Recovering; Comments: The facility owners are working with the farm veterinarian to implement voluntary movement restrictions and biosecurity measures.

For more information, visit:

Strangles

Lanark County, ON

Alert ID: 2023-06

March 22, 2023

Confirmed Case(s) – Voluntary Quarantine

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1 Number Exposed: Unknown Facility Type: Boarding Facility Age: 13; Gender: Mare; Breed: Quarter Horse (QH); Onset of Clinical Signs: 3/16/2023

Clinical Signs: On March 16, the mare developed a fever and a unilateral, foul-smelling nasal discharge which was PCR positive for S. equi. Since a foul smell is not typically consistent with S. equi infection alone, further diagnostic evaluations will occur. There have been no other horses with clinical signs of Strangles on the farm and no recent horse movement. The mare has been on the property for over a year.; Confirmation Date: 3/21/2023 Comments: The facility owner is working with the attending veterinarian regarding biosecurity and movement restrictions.

For more information, visit:

Strangles

Wellington County, ON

Alert ID: 2023-05

March 20, 2023

Confirmed Case(s) – Voluntary Quarantine

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Exposed: Unknown;
Facility Type: Boarding Facility;
Age: 4; Gender: Mare; Breed: Thoroughbred (TB); Onset of Clinical Signs: 3/12/2023

Clinical Signs: The affected mare was recently purchased, arriving on the property March 4. The mare came from a farm from which a horse was confirmed with Strangles March 13. The present mare developed a fever followed by nasal discharge and swollen submandibular lymph nodes and tested positive for S. equi by PCR.

Confirmation Date: 3/17/2023; Horse Status: Recovering.

Comments: A horse at a boarding facility in Wellington County has tested positive for Strangles. She has been moved to a vacant barn on a nearby property. The remaining horses are being monitored for clinical signs of S. equi infection. The facility owner is working with the attending veterinarian regarding biosecurity and movement restrictions.

For more information, visit:

Strangles

Simcoe County, ON

Alert ID: 2023-04

March 16, 2023

Confirmed Case(s) – Voluntary Quarantine

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Exposed: Unknown;
Facility Type: Private Facility;
Age: Yearling; Gender: Filly; Breed: Warmblood (WB); Onset of Clinical Signs: 2/28/2023;

Clinical Signs: On February 27, 2023 an 18 month old warmblood filly was referred to a veterinary hospital for treatment of impaction colic. While at the hospital, the filly developed a fever, followed by enlarged lymph nodes, a cough and nasal discharge. Guttural pouch samples were positive for S. equi on bacterial culture. Infection control procedures were swiftly implemented at the hospital. Based on the timing of the fever, infection was suspected to have occurred on the farm. There is no history of strangles on the farm, however, further investigation/surveillance is taking place. Horse Status: Recovering;
Comments: A horse at a private facility in Simcoe County has tested positive for Strangles. The farm owner has voluntarily placed the premises under movement restrictions and the situation is being supervised by the farm veterinarian

For more information, visit:

Strangles

Oxford County, ON

Alert ID: 2023-03

March 09, 2023

Confirmed Case(s) – Voluntary Quarantine

Source: Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)

Number Confirmed: 1;
Number Exposed: 40;
Facility Type: Boarding Facility;
Age: 20; Gender: Mare; Breed: Quarter Horse (QH); Onset of Clinical Signs: 3/4/2023;
Clinical Signs: This mare had a temperature of 40 C and enlarged lymph nodes.; Horse Status: Recovering;
Comments: The owner of the facility has implemented voluntary movement restrictions and infection control procedures under veterinary supervision.

For more information, visit:

Equine Herpesvirus- Neurologic

Simcoe County, ON

Alert ID: 2023-02

February 24, 2023

Confirmed Case(s) – Voluntary Quarantine

Source: OMAFRA

Facility Type: Boarding Facility;

Number Confirmed: 1;
Number Suspected: 1;
Number Exposed: 38;

Age: 21; Gender: Mare; Breed: Mixed breed; Onset of Clinical Signs: 2/22/2023;
Clinical Signs: This mare developed mild ataxia on February 22, 2023. The day before, a paddock mate developed signs of vestibular disease (head tilt, nystagmus, ataxia) as well as urinary incontinence. Both mares were referred to an equine hospital on February 22 for assessment and treatment. Test results on the mare with vestibular signs are pending but EHV-1 is suspected to be the cause.; Confirmation Date: 2/24/2023; Horse Status: Affected And Alive;
Comments: The facility owner has implemented voluntary movement restrictions and biosecurity measures under the supervision of the attending veterinarian. For more information go to: https://www.equinediseasecc.org/equine-herpesvirus

Equine Herpesvirus-1

Region of Waterloo, ON

Alert ID: 2023-01

January 09, 2023

Confirmed Case(s) – 1

Source: OMAFRA

Facility Type: Private Facility;

On January 5th, 2023, the Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA) was notified of a confirmed case of equine herpes myeloencephalopathy (EHM), caused by equine herpesvirus-1 (EHV-1) infection, at a premises in the Region of Waterloo.

EHV-1 does not pose a threat to public health or food safety.

A mature mare was examined and treated by a veterinarian after presenting with incoordination, which rapidly deteriorated. The premises is under veterinary supervision, including biosecurity protocols, and voluntary movement restrictions have been implemented by the facility manager.

Equine Herpesvirus-1

Wellington County, ON

Alert ID: 2022-01

August 10, 2022

Confirmed Case(s) – 1

Source: OMAFRA

Facility Type: Private Facility;

The Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA) was notified of a confirmed case of equine herpes myeloencephalopathy (EHM) caused by equine herpesvirus-1 (EHV-1) infection at an equine facility in Wellington County. EHV-1 does not pose a threat to public health or food safety.

A mature gelding was euthanized after showing incoordination, which rapidly progressed. This gelding had not been off the property for several years. The facility is under veterinary supervision and biosecurity protocols and voluntary movement restrictions have been implemented by the facility manager. Other horses from the facility had recently competed at an eventing competition in Simcoe County. None of these horses have shown signs of EHM. The risk to other horses competing at the event is considered low given that the horses from the affected facility were maintained at their trailers with limited interaction with other horses or competitors during the event. Out of an abundance of caution, owners or custodians of horses attending the event should monitor the health of their horses, including rectal temperature, and contact their veterinarian if concerned. Health
monitoring should be done for all competition horses regardless of discipline.

For more information, visit:

West Nile Virus

Kawartha Lakes, ON

Alert ID: 2021-18

October 1, 2021

Confirmed Case(s) – 1

Source: OMAFRA

Facility Type: Private Facility;

Age: 13; Gender: Gelding; Breed: Belgian; Onset of Clinical Signs: 9/20/2021;
Clinical Signs: Ataxia, Muscle Fasciculations; Confirmation Date: 9/30/2021; Horse Status: Recovering; Vaccination Status: Unvaccinated;

Notes:

- West Nile Virus info from Health Canada
- Infographics: Equine West Nile Virus

Eastern Equine Encephalitis

United Counties of Leeds and Grenville, ON

Alert ID: 2021-17

September 28, 2021

Confirmed Case(s) – 1

Source: OMAFRA

Facility Type: Private Facility;
Age: 1; Gender: Stallion; Breed: Canadian Cross ; Onset of Clinical Signs: 9/16/2021;
Clinical Signs: Ataxia, Cranial Nerve Deficit, Fever, Hyperesthetic, Recumbency, Seizures; Confirmation Date: 9/27/2021; Horse Status: Euthanized; Vaccination Status: Unvaccinated;

Equine Herpesvirus- Neurologic

Ottawa Region, ON

Alert ID: 2021-16

September 23, 2021

Source: OMAFRA

Number Confirmed: 1;

Age: 25; Gender: Mare; Breed: Not Reported; Onset of Clinical Signs: 9/19/2021;
Clinical Signs: Severe ataxia progressing to recumbency ; Confirmation Date: 9/23/2021; Horse Status: Euthanized; Vaccination Status: Vaccinated;
Notes: OMAFRA was notified on September 23, 2021 regarding a positive test result for EHV-1 from a mare that was euthanized on September 20 due to acute neurologic disease. The mare was located at a boarding facility in the Ottawa region. The facility owner voluntarily implemented movement restrictions on September 17, 2021 after a different mare was referred to a veterinary facility in another province for assessment and treatment of ataxia. The boarding facility is under veterinary supervision. At this time, no other horses have shown clinical signs related to EHV-1 infection.

For more information, visit:

Eastern Equine Encephalitis

District of Parry Sound, ON

Outbreak Identifier: NA

Alert ID: 2021-15

September 20, 2021

Confirmed Case(s) – 1

Source: OMAFRA

Facility Type: Private Facility;

Age: 4; Gender: Mare; Breed: Not Reported; Onset of Clinical Signs: 9/5/2021;
Clinical Signs: Severe Neurologic Signs, Absent Menace Response; Confirmation Date: 9/16/2021; Horse Status: Euthanized; Vaccination Status: Unvaccinated;

Notes: A positive mosquito pool for EEE has been reported for the North Bay Parry Sound District public health unit . https://www.publichealthontario.ca/en/data-and-analysis/infectious-disease/west-nile-virus;

To download a PDF with more information, please click here: https://www.oahn.ca/wp-content/uploads/2021/06/Veterinary-update-Eastern-Equine-Encephalitis-2021-06-18-final-002.pdf

West Nile Virus

United Counties of Leeds and Grenville, ON

Alert ID: 2021-14

September 20, 2021

Source: OMAFRA

Number Confirmed: 1;

Age: 9 year old.

Gender: Mare; Breed: Not Reported; Onset of Clinical Signs: 9/8/2021;
Clinical Signs: Colicky, Fever, Paddling, Recumbency; Confirmation Date: 9/16/2021; Horse Status: Euthanized; Vaccination Status: Unvaccinated;

Notes:

Eastern Equine Encephalitis

District of Parry Sound, ON

Outbreak Identifier: NA

Alert ID: 2021-13

September 20, 2021

Confirmed Case(s) – 2

Source: OMAFRA

Number Confirmed: 2;

Facility Type: Private Facility;

Age: 3; Gender: Mare; Breed: Not Reported; Onset of Clinical Signs: 9/4/2021;
Clinical Signs: Ataxia, Sudden Onset of Discomfort; Confirmation Date: 9/16/2021; Horse Status: Euthanized; Vaccination Status: Unvaccinated;

Age: 5; Gender: Mare; Breed: Not Reported; Onset of Clinical Signs: 9/8/2021;
Clinical Signs: Blindness, Facial Paralysis, Muscle Fasciculations, Recumbency, Severe Ataxia; Confirmation Date: 9/16/2021; Horse Status: Euthanized; Vaccination Status: Unvaccinated;

To download a PDF with more information, please click here: https://www.oahn.ca/wp-content/uploads/2021/06/Veterinary-update-Eastern-Equine-Encephalitis-2021-06-18-final-002.pdf

Eastern Equine Encephalitis

United Counties of Stormont, Dundas and Glengarry, ON

Alert ID: 2021-12

June 18, 2021

Source: OMAFRA

Number Confirmed: 1;

Age: 26 year old.

Clinical Signs: On June 17, 2021, the Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA) was notified of a confirmed case of eastern equine encephalitis (EEE) in a 26-year-old horse located in the United Counties of Stormont, Dundas and Glengarry. The unvaccinated horse developed intermittent bouts of recumbency with somnolence and mild muscle fasciculations with periods of normal behaviour and mentation in between. These signs occurred over the course of several days. The horse is recovering. Laboratory diagnostic testing confirmed infection with the EEE virus (EEEv).

Notes:

To download a PDF with more information, please click here: https://www.oahn.ca/wp-content/uploads/2021/06/Veterinary-update-Eastern-Equine-Encephalitis-2021-06-18-final-002.pdf

Equine Herpesvirus- Abortion

Regional Municipality of York, ON

Outbreak Identifier: NA

Alert ID: 2021-11

April 7, 2021

Confirmed Case(s) – Voluntary Quarantine

Source: OMAFRA

Number Confirmed: 1;

Facility Type: Farm;

Age: 23 yo broodmare

Notes: Aborted at 315 days of gestation; Affected and Alive. Clinical symptoms observed April 3, 2021, with swab PCR confirmation April 7, 2021. Positive on placental and fetal tissue.

For more information, visit:

Equine Herpesvirus 1: Neurologic

Northumberland County, ON

Alert ID: 2021-10

April 6, 2021

Confirmed Case(s) – Voluntary Quarantine

Source: OMAFRA

Number Confirmed: 1;

Facility Type: Boarding Facility;

Age: 24 year old draft cross mare;

Clinical Signs: ataxia and difficulty urinating and defecating ; Confirmation Date: 4/6/2021; Horse Status: Recovering;

Notes:

For more information, visit:

Equine Herpesvirus 1: Neurologic

Municipality of Kawartha Lakes and Wellington County, ON

March 31, 2021

Confirmed Case(s) – Voluntary Quarantine

Source: OMAFRA

Municipality of Kawartha Lakes

Alert ID: 2021-8

Number Confirmed: 1;

Number Exposed: Unknown;

Facility Type: Boarding Facility;

Age: 17; Gender: Gelding; Onset of Clinical Signs: 3/24/2021;

Clinical Signs: Ataxia, Nasal Discharge; Confirmation Date: 3/25/2021; Horse Status: Recovering; Vaccination Status: Vaccinated;

Notes: Under veterinary supervision, the affected horse has been isolated and the facility owner has instituted enhanced biosecurity procedures and animal movement restrictions. No other horses on the property have shown clinical signs. For more information about EHM go to https://equinediseasecc.org/Content/ContentDocs/DiseaseFactsheet-EHM.pdf;

Wellington County

Alert ID: 2021-9

Number Confirmed: 1;

Facility Type: Boarding Facility;

Age: 19; Gender: Gelding; Breed: Pony; Onset of Clinical Signs: 3/24/2021;

Clinical Signs: Ataxia, Difficulty urinating; Confirmation Date: 3/26/2021; Horse Status: Affected And Alive; Vaccination Status: Vaccinated;

Notes: The affected pony is being treated at a referral hospital. No other horses on the property are showing clinical signs. Under veterinary supervision, the facility manager has instituted biosecurity protocols and animal movement restrictions.

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Equine Herpesvirus 1: Neurologic

Municipality of Niagara, ON

Outbreak Identifier: 4624

Alert ID: 2021-7

March 19, 2021

Confirmed Case(s) – Official Quarantine

Source: OMAFRA

Number Confirmed: 1;

Facility Type: Private Facility;

Age: Mature Gender: Gelding; Breed: Not Reported; Clinical Signs: Difficulty urinating, Incoordination of Hind Limbs- Severe, Progressing to Being Down with an Inability to Get Up; Confirmation Date: 3/16/2021; Horse Status: Euthanized; Vaccination Status: Status Unknown;

Notes: On March 16, 2021 the Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA) was notified of a confirmed case of equine herpes myeloencephalopathy (EHM) caused by equine herpesvirus-1 (EHV-1) infection at an equine facility in the Regional Municipality of Niagara. The facility is under veterinary supervision and the farm staff have implemented biosecurity procedures and movement restrictions. This is the fifth equine facility in the province this year that has had a confirmed EHV-1 infection causing neurologic disease.

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Equine Herpesvirus 1: Abortion

Dufferin County and Regional Municipality of York, ON

March 09, 2021

Confirmed Case(s) – Voluntary Quarantine

Source: OMAFRA

Dufferin County

Alert ID: 2021-5

Number Confirmed: 1;

Facility Type: Boarding Facility;

Gender: Mare; Breed: Thoroughbred (TB); Onset of Clinical Signs: 2/27/2021;

Clinical Signs: Aborted during 10th month of pregnancy; Confirmation Date: 3/2/2021; Horse Status: Recovering; Vaccination Status: Vaccinated;

Notes: The facility manager has placed the farm under voluntary movement restrictions for 21 days and staff have implemented heightened biosecurity protocols with veterinary supervision.;

Regional Municipality of York

Alert ID: 2021-6

Number Confirmed: 1;

Facility Type: Private Facility;

Age: Not Reported; Gender: Mare; Breed: Thoroughbred (TB); Onset of Clinical Signs: 3/1/2021;

Clinical Signs: Foal was stillborn; Confirmation Date: 3/4/2021; Horse Status: Recovering; Vaccination Status: Vaccinated;

Notes: The farm manager has isolated the mare and implemented a voluntary 21 day movement restriction. Heightened biosecurity measures are in place and under the supervision of the farm veterinarian.

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Strangles

Cambridge, ON

Outbreak Identifier: 4596

Alert ID: 2021-4

February 19, 2021

Confirmed Case(s) – Official Quarantine

Source: Alcohol and Gaming Commission of Ontario

Number Confirmed: 1;

Breed: Standardbred;

Clinical Signs: Not Reported;

Notes: The Alcohol and Gaming Commission of Ontario (AGCO) was informed a Standardbred race horse at Shamrock Training Centre that had travelled from Red Shores Racetrack in PEI on Sunday February 14, 2021 with four other horses has tested positive for strangles. The race horse is in isolation at another property as of Tuesday February 16, 2021.

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Equine Herpesvirus 1: Neurologic

Regional Municipalities of Peel and Niagara, ON

February 18, 2021

Confirmed Case(s) – Official Quarantine

Source: OMAFRA

Regional Municipality of Peel

Alert ID: 2021-2

Number Confirmed: 1;

Facility Type: Private Facility;

Age: 18; Gender: Gelding; Horse Status: Euthanized; Clinical Signs: Incoordination of Hind Limbs- Severe, Progressing to Being Down with an Inability to Get Up;

Regional Municipality of Niagara

Alert ID: 2021-3

Number Confirmed: 1;

Age: 7; Gender: Mare;

Clinical Signs: Progressing to Being Down with an Inability to Get Up, Difficulty urinating;

Notes: Both facilities are under veterinary supervision and the farm managers have implemented biosecurity procedures and movement restrictions. There are now three equine facilities in the province with a confirmed EHV-1 infection causing neurologic disease.

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Equine Herpesvirus 1: Neurologic

Regional Municipality of Halton, ON

Alert ID: 2021-1

February 05, 2021

Confirmed Case(s) – Official Quarantine

Source: OMAFRA

Number Confirmed: 2;

Facility Type: Private Facility;

Notes: On February 4, 2021, the Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA) was notified of two confirmed cases of equine herpesvirus-1 (EHV-1) infection at an equine facility in the Regional Municipality of Halton. Both horses had a fever and were tested as part of a follow-up investigation into the deaths of three horses at the facility. The three horses were euthanized between January 29- February 3 following sudden onset of sever incoordination and being down and unable to rise. The facility in under veterinary supervision and the manager has implemented strict biosecurity measures and movement restrictions.

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