I've been on Tysabri since 1996, with a brief break when the drug was recalled by the FDA. I tested positive for the JC virus several months ago. At my last two checkups, my neurologist has encouraged me to extend the period of time between infusions to 5 or perhaps even 6 weeks, which he thinks may lessen my chances of contracting PML. That's not an option for me -- I begin to experience extreme fatigue by day 25 or so after my infusion, and the two times that I've had to go 6 weeks between infusions (because of sinus infections) were miserable. I choose to continue on Tysabri until something else is developed that will keep my MS as stable as it is now. I am aware that as a 6-year Tysabri user and JC virus carrrier that PML is a very real risk for me, but it's a risk that I knowingly choose to take in exchange for the health and quality of life that I have today. I think the question of whether to continue on Tysabri really boils down to what kind of person you are: Do you eat your salad first because it's better for you, or dessert first because the roof could cave in unexpectedly? I'm the latter.

Good luck and God bless.