RW: Thanks for all the useful information once again. Correct me if I'm wrong but AIDS the disease leads to the weakened immune system (low T cell count) not the drugs patients take. These patients don't take immunosuppressant drugs because that is counterintuitive and dangerous--hence, the effort to find antivirals that could wipe out or put into remission the HIV virus.

Just to add to what RW has said, while the idea of PML worries me, mostly when these cases arise, I am also planning to stay on Tysabri for the near future. I have been on it a year now and just recently I have noticed a big change in how I feel. It kind of snuck up on me. ALL my fatigue is now gone. I feel like I did before I got MS. I sometimes forget I have MS which is such a nice thing. It really is remarkable! I can see why people pushed for this drug to be offered again as an option. Anyhow, for now I am quite happy and feeling more assured that people are surviving PML and not all are seriously disabled.