Two people developed the brain viral infection, PML, recently in Europe on Tysabri without other MS treatments.  A new case was reported today in a  MS patient  in the U.S. previously treated with beta-interferons and Copaxone.  The patient had received 14 infusions of Tysabri alone.  This represents the sixth person on Tysabri to develop PML.

Posted by Barry Singer, MD on October 29th, filed under MS Research News.