Horse Influenza Surveillance: Welfare and Outbreak Prevention

Equine influenza surveillance networks enable rapid outbreak detection and response, reducing the welfare burden of disease episodes in horse populations.

Key Facts

Equine influenza is one of the most contagious equine respiratory diseases, spreading rapidly through horse gatherings
The 2019 Australian equine influenza outbreak affected over 75,000 horses and caused massive industry disruption
Vaccination is highly effective but requires biannual boosters due to antigenic drift in circulating strains
Global surveillance networks including HBLB and OIE monitor circulating strains and update vaccine recommendations
Influenza-affected horses experience fever, cough, nasal discharge, and fatigue for 2-3 weeks
Competition venues and racetracks are high-risk transmission environments requiring strict biosecurity protocols

Welfare Considerations

Equine influenza causes genuine suffering — fever, respiratory distress, and prolonged fatigue in affected horses. Outbreak prevention through surveillance-guided vaccination is the most welfare-effective strategy, preventing disease rather than treating it. The Australian 2019 outbreak demonstrated how rapidly equine influenza can spread and the scale of welfare harm possible. Surveillance networks that guide vaccine strain updates are analogous to human influenza programs and have substantially improved vaccine efficacy over time.

What You Can Do

Vaccinate horses for influenza following current HBLB or AAEP biannual recommendations
Report suspected influenza cases promptly to support surveillance and contact tracing
Implement biosecurity protocols at events — nose-to-nose contact between unvaccinated horses is the primary transmission route
Support equine infectious disease research and surveillance funding through veterinary associations