So how did the first ones ever get it? And the hope is that it came from Louisiana -- but it has never actually been found to exist in Louisiana?
I think the more likely case is there is something environmental that causes it -- and without supplemental or confined feeding and overpopulation those animals die without any notable impact on anything. It's possible that another animal contracts it from that one's "footprint" so to speak somewhere down the line and does the same, but there isn't notable spreading until there is a feeding bottleneck. Obviously that has never been proven and may not ever be proven. I know an animal was harvested on family land several years ago that showed a few of the symptoms, which led me to research the cause of the disease, and the first thing that popped up was sewage sludge, which went off like a light bulb for me due to location of the property and how much of that has happened adjacent to it. I might be reading the website equivalent of seeing dead people on this, I dunno... Just seemed to add up...