Deadly animal prion disease appears in Europe : Nature News & Comment
So, there's been a prion disease (similar to "Mad Cow" disease) floating around part of the world's deer, elk and moose population, and now it has spread (via unknown route) to Norway.
The most worrying thing I find about the report is that the disease is spread between animals via prions in saliva, urine and faeces. It also seems possible that the disease can arise spontaneously.
If ever a human variant got going, and it was so easily spread, it would be a truly dire problem to deal with. Especially if prions could be spread through treated sewerage into drinking water.