Equine Influenza (Horse Flu)
Highly contagious viral airway disease caused by the equine influenza virus (orthomyxovirus, type A). It spreads rapidly by droplets and typically causes sudden fever and a dry cough; with an uncomplicated course healthy horses usually recover, but premature exertion can prolong the illness.
Veterinary care required
This condition belongs in veterinary diagnosis and treatment. Compounds are at most supportive.
Priority · vet & management
With fever and cough and suspected contagion, isolate affected horses immediately and involve the vet; the core protection is vaccination per veterinary recommendation. Consistent box rest (rule of thumb: about one week of rest per fever day) is central to avoiding lasting damage.
Possible causes
- · equine influenza virus A (subtypes H3N8)
- · droplet infection via coughing/sneezing (range of several metres)
- · indirectly via hands, grooming kit, drinkers and transporters
- · introduction by purchased horses or those returning from competitions
Supportive compounds · supplementary feed, not medication
Vitamin C
AMGFEI freeantioxidant under oxidative airway strain (adjunctive, in recovery)
Compound profile →Rosehip
AMGFEI freevitamin-C/polyphenol source, discussed as antioxidant (adjunctive)
Compound profile →Ribwort plantain
AMGFEI freemucilage, traditionally soothing for the airways (adjunctive)
Compound profile →Spirulina
AMGFEI freediscussed as immune-modulating (adjunctive, no protection against infection)
Compound profile →Prevention
Vaccination according to veterinary vaccination recommendation (primary immunisation and regular boosters; usually mandatory for competition horses), quarantine of newly stabled horses and hygiene around grooming kit, drinkers and transport lower the outbreak risk within the yard.
Equiterna's take
Equiterna links the recovery phase to airway protection and antioxidant support — the actual protection remains vaccination, isolation and yard hygiene. In Germany equine influenza has been notifiable since 2023 (labs/vets, monitoring).
Usage note
This content is for information and education. It does not replace veterinary diagnosis or treatment. If your horse shows signs of illness, consult a veterinarian.
Equiterna is an intermediary platform for equine knowledge, marketplace and tools — not a veterinary-medicines dealer, veterinary practice or pharmacy. Compound information is study-attributed and free of healing claims. Legal framework: Regulation (EU) 2019/6 / TAMG (DE/AT), Feed Regulation (EC) 767/2009, FEI Prohibited Substances List, HWG.


