I'm on Tysabri..and have high JC numbers.. been on T for over 6 years now..and yes they check me every 3 months.. and it hasn't deviated at all..and I have not had any problems.. and since on it, not relapses..

Yes there is a possibility of getting a brain virus from Tysabri if your John Cunningham (JC virus) numbers are high. Almost everyone is born with this virus that by itself is not dangerous at all. In fact you don't even know you have it. But, the higher the number is the more risk you are in. That is why if your number is high you will only stay on Tysabri for a year or two. They check the number every 3 months. Beautiful disease we live with isn't it?

will post in a new line since this is a different question...

I am not sure what that is.

What are your experiences with duloxetine hcl dr ?