Disease Alerts

Number Confirmed: 1; 
Number Euthanized: 1; 

Horse 1: 
Age: 3; Gender: Gelding; Clinical Signs: front and rear ataxia, muscle fasciculation, disorientation, and inability to rise. The horse was euthanized Oct. 17, 2025.; Horse Status: Euthanized; Vaccination Status: Status Unknown;

Number Confirmed: 1; 
Number Exposed: Unknown; 

Horse 1: 
Age: Weanling; Gender: Colt; Breed: Paint; Onset of Clinical Signs: 10/6/2025; Clinical Signs: Dull mentation, blindness, ataxia, hind end weakness, increased recumbency; Confirmation Date: 10/15/2025; Horse Status: Recovering; 

Comments: Colt is out of a vaccinated dam and may be a case of waning maternal immunity. Colt would not yet have been due for vaccination.;

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

Horse 1: 
Age: Weanling; Gender: Colt; Breed: Quarter Horse (QH); Onset of Clinical Signs: 10/4/2025; Clinical Signs: neurologic, died, only had initial vaccination; Confirmation Date: 10/15/2025; Horse Status: Deceased; Vaccination Status: Vaccinated;

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

Horse 1: 
Age: 3; Gender: Gelding; Breed: Percheron; Onset of Clinical Signs: 9/27/2025; Clinical Signs: Neurological, colic; Confirmation Date: 10/3/2025; Horse Status: Deceased; Vaccination Status: Status Unknown;

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

Horse 1: 
Age: 10; Gender: Mare; Breed: Miniature Horse; Onset of Clinical Signs: 9/1/2025; Clinical Signs: This mare was euthanized after becoming acutely recumbent and developing seizures. Another miniature horse had died after developing similar signs two weeks prior.; Confirmation Date: 10/3/2025; Horse Status: Euthanized; Vaccination Status: Undervaccinated;

Comments: This is the 8th confirmed equine EEE case 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;;;

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

Horse 1: 
Age: 6; Gender: Gelding; Breed: Standardbred; Onset of Clinical Signs: 9/10/2025; Clinical Signs: The owner described seizure-like activity after becoming acutely down on 09-10-25. The patient presented in lateral recumbency with a temperature of 108.6. The patient was still blinking but did not display a menace response.; Confirmation Date: 9/16/2025; Horse Status: Euthanized; Vaccination Status: Unvaccinated;

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

Horse 1: 
Age: Yearling; Gender: Filly; Breed: Thoroughbred (TB); Onset of Clinical Signs: 8/1/2025; Clinical Signs: Neurologic; Confirmation Date: 9/11/2025; Horse Status: Deceased; Vaccination Status: Unvaccinated;

Comments: This is Florida's 9th confirmed case of EEE for 2025;

Number Confirmed: 1; 
Number Exposed: Unknown; 
Comments: The Georgia Department of Agriculture has confirmed Eastern Equine Encephalitis (EEE) in 1 horse in Effingham County. The 2025 total reported EEE cases in GA for the year to date is 4 confirmed and 1 suspect.;