I agree also that is the best explanation. And it couldn't have come at a better time for me. I am due at the Cleveland Clinic for follow up on Tuesday, Sept. 19. I do have more active lesions since my first MRI in March and I was just diagnosed with MS May 1st. I am presently on Copaxone but I've had a rough time with attacks & my doctor feels that I may benefit from Tysabri. I am only 42 & recently found out I am going to become a grand mother so I said I would do whatever to be able to hold that child. Needless to say I was worried about going on Tysabri. Oh I forgot to mention that I started on Avonex only to find out I'm allergic to interferon and that is why I am on Copaxone now. Thank you for the wonderful service you are providing.