Equine influenza is a common respiratory infection in horses caused by the equine influenza A type-2 virus. While influenza is not particularly harmful to affected horses (i.e., it has a very low mortality rate), it is associated with explosive outbreaks that have a large economic impact on the industry. Vaccination of at-risk horses and continually updating the flu vaccines play a crucial role in limiting the damage caused by this virus.

“Influenza is a moving target, often changing its coat to confuse the immune system.”
–Dr. Tom Chambers
“While not considered a core vaccination by the American Association of Equine Practitioners (AAEP), it is recommended that all horses should be vaccinated against the flu unless they are part of a closed herd,” explained Tom Chambers, PhD, who heads the OIE Reference Laboratory for Equine Influenza at the University of Kentucky’s Gluck Equine Research Center in Lexington.

All of the current influenza vaccines are believed to provide protection for at least six months duration. Thus, bi-annual vaccination against flu for at-risk horses (e.g., mature performance or show horses) is recommended. Recommendations for other horses vary and are available at aaep.org/equine_influenza.htm

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