What I don't understand is that according to our local Vet hospital, who put out a blurb on this on FB, most horses have been exposed to this virus already, and carry it in them? The risk is if they are stressed and their immune system is depressed. This is typical of herpes virus. So, why is it so much of a concern? If iit's always in their systems anyway?
I confess my ignorance on this, so am asking this question to those who might know more.