My doctor was talking about the option of doing a spinal tap in the end of the summer (which is when I told her I was thinking of going off tysabri, as I don't want to risk another hard summer like it was last year at peak of the bad post-partum flare...) So that would be to look for different kind of evidence about if JC virus is there or not? Anyone have more details/experience with this?

Rescheduled infusion for next tuesday.