MS drug linked to lethal brain infection

“A new case of a rare, often lethal, brain infection has been linked to the multiple sclerosis drug Tysabri, making it the ninth case of progressive multifocal leukoencephalopathy (PML) infection potentially caused by side effects of Tysabri since the drug was put back on the market in July 2006.

Biogen Idec Inc., the maker of Tysabri, reported the case on Friday, one week after the eighth case was reported. The company indicates that they will no longer report each individual cases of Tysabri PML infections, but will provide a weekly update on their website.”

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