I saw on Fox News Sunday Housecall today, 6/5/05, something about shingles. He was discussing a vaccine that will soon be available to help prevent or lessen cases of shingles. Shingles come from the chicken pox virus. If you had them, the virus is laying dormant all along your spine. When the immune system is suppressed, sometimes, not always, the virus is reactivated into shingles and go along the nerves they were laying dormant on. If you were taking more than tysabri, maybe your immune system was surpressed too much. If not, then that may become a side effect for tysabri users. But the vaccine sounded nice. I had an aunt recently that had a very bad case of shingles. Just some knowledge.