Major risk factors include being compromised by injury or illness, being very old or very young and not being regularly vaccinated. The consequence of infection in compromised unvaccinated horses may be more severe. Click here for more information.
Horses that travel or live on large yards are particularly likely to encounter the virus.
Vaccinated horses may show no signs of flu themselves but are still able carry the influenza virus around and pass it on to other horses. For this reason vaccination protocols for companion ponies and older horses should be carefully considered: even if they don’t leave the yard themselves they can be infected by other vaccinated horses who do travel.