Billie Baird you might be on to something. Several months ago I posted a message looking for others who were not bothered by colds or flu. I had seen an article to that effect in a library medical book about 13 years ago when I was first diagnosed. I received about 8 responses, half did still have colds and half did not. I personally have not had a full blown cold in 15 years. The common denominator may be smoking. I gave up smoking at age 43, was diagnosed with parkinson's at age 45 and am now 60. So counting you, Don Mckinley, and me, we have 3 Yes votes vs 0 No votes for Smoking, Parkinson's and No Colds.