The rule of thumb is Spring & Fall but…
A “standard” vaccination program for all horses does not exist. Each individual situation requires an evaluation. Ask your farm vet what is best for your horse.
In Arizona, we have the risk of several infectious diseases, which can be vaccinate for. These vaccinations are different based on the age, condition and exposure of the horse.
In Phoenix, March is the best time to give spring shots. Here at the ranch, I vaccinate for Eastern & Western Encephalomyelitis, Tetanus Toxoid, Influenza, and West Nile.
A General Guide for the Adult Horse
Tetanus Toxoid, Eastern & Western Encephalomyelitis: Spring, Annual
Influenza & Rhinovirus: Bi-Annual/Spring & Fall
West Nile: Bi-Annual/Spring & Fall
Strangles: Bi-Annual/Spring & Fall
Anticipated exposure, environmental factors, geographic factors, age, breed, use, and sex of the horse affect the risks of disease.
The primary series of vaccines and booster doses should be appropriately administered prior to likely exposure.
Each horse in a population is not protected to an equal degree, or for an equal duration, following vaccination.
Protection is not immediately afforded the patient after administration of a vaccine that is designed to induce active immunity. In most instances, a priming series of multiple doses of a vaccine must be administered initially for that vaccine to induce protective active immunity.
All horses in a herd should be vaccinated at intervals based on the professional opinion of the attending veterinarian
A properly administered, licensed product should not be assumed to provide complete protection during any given field epidemic.
amy elizabeth, TBN Ranch