Horse Equine Influenza: Prevention and Welfare

Equine influenza is a highly contagious respiratory disease causing significant suffering in affected horses. Vaccination and biosecurity are the cornerstones of prevention.

Key Facts

Equine influenza is caused by H3N8 and H7N7 influenza A viruses
Clinical signs include fever up to 41°C, harsh cough, nasal discharge, and profound lethargy
The virus spreads through respiratory droplets and can move across continents via horse movement
Outbreaks can affect entire yards, causing welfare impacts across large numbers of animals simultaneously
Recovery from uncomplicated influenza takes 7-14 days with rest and supportive care
Many sporting governing bodies require regular vaccination as a condition of competition entry

Welfare Considerations

Equine influenza causes genuine suffering similar to severe human influenza. Affected horses feel profoundly unwell, experience painful coughing, and require extended rest. Returning horses to work too quickly after influenza increases the risk of myocarditis and serious cardiovascular complications. The widespread nature of outbreaks means that failures in vaccination programs result in welfare impacts across entire regions of the horse population.

What You Can Do

Maintain current vaccination with equine influenza vaccine according to veterinary recommendations
Implement biosecurity when introducing new horses — isolate for 14 days and monitor temperature
Take rectal temperatures during any outbreak at your yard to identify affected horses early
Provide affected horses with complete rest for the recommended recovery period
Ensure adequate ventilation in stables, as poor air quality worsens respiratory disease
Report suspected outbreaks to your vet and relevant horse health surveillance programs