Pathogens Causing PD?

Found at:
http://neurotalk.psychcentral.com/thread33514.html
It is by no means certain that pathogens have nothing to do with PD
Just a couple of possibilities-
1) A pathogen called Nocardia has been shown to cause parkinsonism.
2) You may have heard of the German researcher Braak's work demonstrating that *something* enters the nerve fibers in the nose and stomach and then leaves a trail of Lewy bodies like bread crumbs as it marches into the brain en route to the substantia nigra. One other thing that follows a similar pattern is the polio virus.