I am no scientist, and so am unable to evaluate the scenario Ivan presented about the viral origin of PD. I think it is certainly worth considering, along with other approaches, as he makes what seems a very convincing case. Thanks, Ivan. for this thoughtful and thought-provoking contribution to the list. Camilla Flintermann, CG for Peter 80/70/55 Oxford, Ohio http://www.newcountry.nu/pd/members/camilla/one.htm <[log in to unmask]> "Ask me about the CARE list for Caregivers of Parkinsonians ! "