To build on Allen’s excellent post a page or two back, there really isn’t any indication that this disease has always been around. CWD has a very predictable pattern, meaning the geographic distribution is radial and progressive. Starts small, with a couple cases, then grows outward in geographic area and prevalence.
If it had always been on the landscape, we would’ve picked up pockets of the disease much more randomly, and at much more varying prevalence rates. We wouldve likely documented disease impacts in the wild much sooner as well. Instances like mentioned in the article that started this thread would’ve been documented all over the map, literally, with no pattern or predictability.
Instead, the places where it’s been the longest or where best management practices aren’t being adhered to, the disease is the worst and/or growing the fastest.