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I have not been tested for antibodies to Tysabri, and will request that it be done when I go in for my next infusion. Thank you for the advice!

BTW, I have not had a return of the arthralgia, although the 22 day mark is still a few days out............

I have received four infusions of Tysabri since March, with no unpleasant effects during the infusions (other than multiple attempts to find the appropriate vein). HOWEVER, approximately 20 days after my third infusion, I developed severe joint pain -- could feel every vertebrae, every carpal AND ta...