Jerry Vaske is a stats guy from CSU. Human dimensions in natural resource management type stuff.
LOL, you said "Human Dimensions".
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Q: How do we know this stuff hasn't been around for a millenia?
I think the "easy" answer to that is, well...easy. If it had been around for a millenia, we should probably have expected it to have somewhat spread over time. The evidence of where it spread out from is pretty obvious. There were pockets of CWD surrounded by similar levels of testing that found nothing for years and years, the spread of it is well documented via the testing.
We're a little off track here, but I read an article a while back that compared and contrasted CWD and BSE since they are fairly similar. At this point one of the biggest differences between the two is that BSE has a known problem for humans when we've eaten the contaminated animal. I do not put myself out there as prion based infectious disease expert, but since we know it can be transmitted via saliva, one of the great fears expressed was that if/when it does cross over to people, do we really want CWD infected animals leaving slobber on our food supplies (wheat, corn, sunflowers, lettuce, etc)?
Look at all the e-coli outbreaks and prepared salad recalls that have come from wild pigs grazing on our salad fields?