From first hand knowledge I will tell you that all deer get EHD from 5yr old bucks to new born fawns. This year we lost 11 bucks from 1 to 5 years of age. We did have 3 bucks that had no symptoms, and they were 1, 2 and a 3 yr old. They were the first to die. We then had it move in to our adult does. We lost 29 adult does. But we also had 19 survive, and out of the 19 we had 6 that showed no clinical signs of EHD. Then came the fawn losses. We lost 33 of 39 fawns. The fawns all died very quickly and very suddenly, all the way through November 3rd.
If there is a silver lining to this scenario we now know that if a mother gets EHD then her fawns will most likely get EHD and they will die as well. We did not have one Mother die that her fawns survived. But, we did have 6 does that showed no clinical signs and all of their fawns lived as well.
It shows EHD definitely has a barrier between the mother and the fawns and the resistance that they show. Some hereditary traits do show resistance. I will not go in to which ones lived or died as that may be different from farm to farm, but on our farm certain genetics with stood the tolerance more so than others!
We have vaccinated for EHD and have a misting system in place. EHD is a very ugly and deadly issue. With that said I am not sure we can control EHD, but we can control the animals it effects and how they are effected, if you get what I am saying. Genetics, facilities, and prevention! These are the things I will be doing in the future at our farm! So not to say that a vaccine won't work, because I hope they find one that does, but that I do not believe in a vaccine and will take other measures until some one can prove to me that there is hope!