Be gravely concerned about EHV-1.
Personally were I in a state adjoining any infected states, I would keep my horses at home and not allow ANYONE on my property without a thorough shoe wash, scrubs and sanitation of any tools (for farrier, etc..). Until the last case is 2-4 weeks from initial illness, the epidemic is still considered to be active.
EHV-1 in the neurological form can devastate and kill even the healthiest horses, regardless of age, gender or inoculations. It is highly infectious and even being on a farm adjacent to an affected horse can put your horse at risk. Horses who are infected do not always show symptoms so the best practice is to stay home and bleach and Virkon absolutely everything that's been off the property or in contact with another horse. Don't go to other people's farms and JMO I would even avoid going to horsey social events or meeting a friend for coffee until the whole thing blows over!!
Years ago there was an EHV-1 outbreak and one show facility was the catalyst for the spreading of the disease (about 8 hours away from me) and they were devastated. The entire horse industry, including racing, completely shut down for quite a period until everything blew over. I don't think a single dressage horse contracted it - but there were no dressage clinics, there were no dressage shows and people from different barns simply called one another to chat instead of meeting up. Even 8 hours away, we were scared!
They say money doesn't buy happiness -- well happiness doesn't buy horses!