A case of equine influenza in horses Ohio has been confirmed at a fairground in Darke County. Early detection and strict biosecurity are essential to prevent disease spread.
Case Details
- On October 29, 2025, a yearling Standardbred tested positive for equine influenza after developing a cough, intermittent fever, and bilateral mucopurulent nasal discharge.
- Six additional horses are suspected to be positive, and 30 horses have been exposed at the fairgrounds.
About Equine Influenza
Equine influenza is a highly contagious respiratory virus that affects horses, ponies, and other equids, including donkeys, mules, and zebras. The virus spreads via:
- Direct horse-to-horse contact
- Aerosol transmission through coughing or sneezing
- Contaminated hands, shoes, clothing, tack, buckets, or equipment
Clinical Signs
Horses infected with equine influenza may show:
- High fever (up to 106°F)
- Dry, hacking cough
- Depression, weakness, or anorexia
- Serous (watery) nasal discharge
- Slightly enlarged lymph nodes
Monitoring your horse’s temperature daily during shows can help detect infection early and limit disease spread.
Prevention and Biosecurity
Vaccination
Vaccination is an effective and cost-efficient way to protect horses. US Equestrian requires proof of an equine influenza vaccination within six months of participation in sanctioned events. Your veterinarian can advise on additional vaccines.
Biosecurity Measures
To reduce infection risk:
- Quarantine new arrivals at barns
- Disinfect buckets, tack, and equipment
- Prevent nose-to-nose contact between horses
- Limit exposure to infected animals
Early detection, vaccination, and strict hygiene practices are critical to protecting horses at fairs, shows, and boarding facilities.
About EDCC Health Watch
EDCC Health Watch uses data from the Equine Disease Communication Center (EDCC) to provide verified updates on equine diseases. The EDCC is a nonprofit supported by industry donations, offering open access to infectious disease information for horse owners and professionals.
