Ivan and Greg - People in our support group noticed and commented on the fact that PWP seem to have strong immune systems. In Dick's case, although he has had PD for 18 years, his seeming immunity was present even in childhood. He didn't even get chicken-pox when exposed multiple times. On very rare occasions, he'll have mild, short-lived symptoms of something the rest of us think we're dying from. <grin> I wonder if any researchers are investigating whether PWP truly do have better immunity than average, and if so, why. Margie Swindler home design and remodeling/blueprints/miniatures/model railroads