Just for information:
I've been corresponding with my 'good' neuro about EBV and MS. I mentioned that some PP sufferers on another site were reporting good results from Rituxin (anectodal stuff, but many claimed progression had been halted).
This neuro said he was hopeful about Rituxin as it targets B-cells - one of the places where EBV lives. Just his opinion - but it will be interesting to see if the trial results (interim results) with PP sufferers does show promise as this might support his theory about EBV triggering / causing MS.