I have been on Tysabri for four (4) years. This year I have experienced the reactivation of dormant viruses - a herpes zoster (shingles) and a HPV positive pap test. I had normal pap tests for over 35 years with the last one being the same year that I started Tysabri. In 3 1/2 years, the reactivated HPV virus caused a severe cervical cell change (dysplasia). I am concerned that the Tysabri immunosuppressant played a major role in acerbating these viruses and want to stop Tysabri. What are the consciences of stopping Tysabri?