2 more PML cases in MS patients on Tysabri September 15, 2009
Two more cases of a rare brain infection have emerged in users of the multiple-sclerosis drug Tysabri, sold by Biogen Idec Inc. and Elan PLC, the first such incidences since Biogen stopped updating investors of the situation in July.
http://online.wsj.com/article/SB125294848127909243.html