It was first documented in the US in Colorado first, as they were studying scrapies. I've never heard it originated here.
I have always believed it has been here just was brought to light with testing.
Beth Williams had a lot to say about that. Sure wish she was around to clear some things up. RIP Beth.
Virtually all of the "scientists" who benefit from it being a man caused morph of a disease previously limited to sheep say it was the fault of the researcher in Colorado.
Because if it's NEW and a man caused morph, it can be heralded as a threat to all deer and human life, and garner billions (over decades) for the "scientists" who study it to help "protect us from the coming apocalypse" they are so carefully inventing.
If it proves to be a pre-existing disease that affects only certain cervid species, is so slow acting and specific that it never significantly impacts deer populations, and proves not to be able to jump to bovines much less humans.... well, there's no money in that.