Cameron, i live here in missouri and i know forsure it works great. A few years ago EHD hit the country hard. I have a hunting preserve that lays right against my breeder pens. We vacinated the breeder herd for the first time the year the vaccine came out and was dragging deer out of the fields in the preserve twenty yards from my breeder pens. I lost alot of sleep worrying but in the end i didn't lose a deer to EHD in my breeder pens. We lost close to a third of the unvacinated herd in the preserve. Hopefully that answers your question..