My neurologist (who is a GBS specialist) told me that 1 in 100,000 in the U.S get GBS (which I already knew), and you have 1 in 1,000,000 chance of getting it again.

If okay, please allow me to ask a slightly different question (or perhaps worded a bit differently and I am too ignorant to understand the initial inquiry):

Once you have had GBS, do you have an increased chance of a second onset? Also, what are the chances of a second onset?

Many thanks