Horse Equine Influenza and Respiratory Welfare

Equine influenza is a highly contagious respiratory disease that causes significant welfare suffering in horses. Vaccination programs and biosecurity measures are the primary welfare protection strategies.

Key Facts

Equine influenza spreads rapidly through shared airspace; outbreaks can affect entire yards within days
Clinical signs include high fever, severe nasal discharge, cough, and profound lethargy lasting 2-3 weeks
Post-influenza recovery requires a rest period of one week per day of fever to allow full respiratory recovery
Vaccination is highly effective but requires regular boosters every 6-12 months as antigenic drift occurs
An unvaccinated horse can shed virus for up to 10 days; movement restrictions during outbreaks are essential
The 2007 Australian equine influenza outbreak caused enormous welfare and economic impact across the thoroughbred industry

Welfare Considerations

Equine influenza causes genuine acute welfare suffering through high fever, respiratory distress, and prolonged debilitation. Return to work too early following influenza infection causes complications including myositis and potentially fatal myocardial damage. Inadequate post-influenza rest is a welfare problem driven by competitive pressure in performance horse contexts. Biosecurity at competitions, markets, and yards is the primary prevention strategy alongside vaccination. The economic disruption of outbreaks creates welfare pressures as yard management becomes more restrictive and horses experience reduced social contact and altered routines during lockdown periods. Welfare-oriented outbreak management balances biosecurity needs with maintenance of behavioral needs.

What You Can Do

Vaccinate all horses against equine influenza on schedule and maintain records for competition compliance
Implement yard biosecurity protocols including isolation of new arrivals for 14-21 days
Allow full recovery periods following any respiratory illness before returning horses to work
Support equine disease surveillance programs that provide early outbreak warning