Equine Influenza Prevention: Vaccination, Biosecurity, and Welfare

Equine influenza causes significant morbidity in horses and disrupts competition and breeding programmes, requiring coordinated vaccination and biosecurity.

Key Facts

Equine influenza is a highly contagious respiratory disease causing fever, cough, nasal discharge, and lethargy.
Major outbreaks have caused significant welfare impact and economic disruption in major horse populations globally.
Vaccination provides partial protection; vaccinated horses who become infected typically show milder disease.
FEI regulations mandate vaccination for competition horses with minimum interval requirements between doses.
Biosecurity including isolation of new arrivals and avoiding equipment sharing reduces outbreak risk.
Australian outbreak in 2007 demonstrated the catastrophic welfare and economic impact of introduction to a naive population.
Viral evolution requires regular vaccine strain updates, with vaccine manufacturers monitoring circulating strains.

Welfare Considerations

Equine influenza welfare significance is greatest at the population level: when the virus reaches a naive or inadequately vaccinated population, it spreads rapidly and causes significant respiratory illness across many animals simultaneously. The 2007 Australian outbreak infected an estimated 140,000 horses, causing widespread welfare impact in a country that had previously been free of the disease. Individual horse welfare from influenza includes significant respiratory discomfort, fever, and recovery periods requiring rest from work. Vaccination compliance across the horse-owning community creates herd immunity that protects immunocompromised or unvaccinable individuals. Biosecurity during movement and competition events is the complementary prevention measure that vaccination cannot fully replace.

What You Can Do

Maintain vaccination according to FEI requirements and vet recommendations for all horses in your care.
Implement a 3-week quarantine protocol for all new horses entering your property.
Avoid sharing equipment including buckets, bits, and grooming tools between horses from different premises.
Report suspected influenza outbreaks to your veterinarian promptly for confirmation and contact tracing.
Stay informed about circulating influenza strains and vaccine updates through your equine vet.