This particular strain, yes. There are cases where vaccinated horses have got it, but I'm unsure if they were vaccinated with the exact vaccine needed. In any case, vaccinated horses will not get it as bad as unvaccinated horses.
Can a unvaccinated horse give it to a vaccinated horse?
There is an isolation stable, and there's quite limited amount of movement of horses, which helps. If there was a break out of something here, there would likely be no movement of horses. I feel there could probably be more done.
All of our horses are vaccinated against influenza, but for other contagious diseases we don't show when there is a spread, we don't accept new horses and we are more attentive when we hack for example
What about you?