Change of seasons?

I was early November. I’m wondering if the commen factor for GBSers whose onset was Nov., Dec., Jan. is climate related. I have a sister who has had MS for many years. She would always get worse and relapse in the fall…change of seasons, temperture. It may not be the holidays as much as what is going on around us during that period of the year. Flu season and shots, colds and infections…all being possibilities to the onset of GBS.

So where is everybody from that contracted GBS in the winter months?
I’m 90 miles west of Chicago.
JayDee