Tysabri (natalizumab): I dont know the numbers but there are several patients who are taking injections of tysabri (natalizumab).
Answered 3/18/2013
5.9k views
Possibly 70,000: Don't have the exact numbers, but I have been informed of 65-70, 000 world-wide currently.
Answered 7/8/2012
5.7k views
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