Maybe but people look at epidemiologic patterns (i.e. the whole point of the World of Warcraft Zombie paper earlier), and Parkinson's disease doesn't really see

Maybe but people look at epidemiologic patterns (i.e. the whole point of the World of Warcraft Zombie paper earlier), and Parkinson's disease doesn't really seem to show any of the typical patterns. It's a really difficult problem, and also the reportability of linked cases may be an issue, as if you "get" parkinson's, you don't really know until 10 years or more after the fact... There may be something to whatever makes misfolded synucleins agregate, but at the last big international conference, there was a battle royale between the pro's and the con's of prionism, i.e. do synucleins exhibit the properties of the prions involved in CJD and other prion disease, vs. just being an example of a self aggregating protein. The con's won by a healthy margin