Welcome, Harry. My Grandpa's name was Harry, but I am, also now, a Grandmom of 8....4 of whom I see on a weekly basis.

I'm so sorry to hear about your Grand's MS. There is an info and check-in thread for Tysabri. You are certainly welcome to read there and ask question. There are many here, who are on Tysabri and I'm sure will be happy to talk to you about it.

Again welcome!!