Yes, it has been bugging me since I gave the blood 4 weeks ago. And of course I think, well the whole time I shouldn't have been as anxious as I have been about PML (so much for attempting mindfulness! ) But I had this weird feeling that maybe I would test negative, or at least I thought it was possible. I didn't get Epstein Barr virus (mononucleosis) until I was 36. And supposedly everyone gets that as a teenager. And I got Cytomegalovirus later in my 20s (which is like mono in that a lot of people have been exposed early on and for immune compromised people it can rear up, such as in AIDs patients). And I don't have any herpes viruses like cold sores. So......maybe my immune system was able to ward off many viruses over the years??? Until I went on Tysabri I hadn't had a cold in 10+ years. And even then I've only have 1 cold in the past 14 years. But I do feel damn lucky!

RW, it sounds like you would have been exposed to something rolling around in the dirt and eating in other countries!! I'm sure as time goes on they will discover more about JC virus and how it operates. I feel optimistic that they have identified new experimental anti-virals which recently have seemed to help those with PML. I hope eventually there will be a way to treat PML if people get it.

Then again, my neuro told me I had to be tested in another 6 months because there is no guarantee that you will remain negative forever. AND...he also told me there is a 2% false negative rate. But those odds seem worth taking.

I'm just relieved as my body knows and tolerates Tysabri. I have been following people on Gilenya and it wasn't making me eager to try it. Hair loss, heavy fatigue, weird itching/tingling, and shortness of breath don't sound appealing.