Thanks so much for the words of support and information.

I know that the PML is very rare, and that the antibody test just means that at some point I was exposed. But it's still super scary to me.

I didn't know that the IR was all or mostly all people who had plasmapherisis. I think I was conflating it with the possibility of a flare happening in the first 6 months of going off drug. So it's good for me to remember not to mix them up...

ok now i have to call to reschedule the infusion...

JD