Virus responsible for deadly brain disease found in MS patients treated with natalizumab

The virus responsible for PML (progressive multifocal leukoencephalopathy), a rare brain disease that typically affects AIDS patients and other individuals with compromised immune systems, has been found to be reactivated in multiple-sclerosis patients being treated with natalizumab (Tysabri). The findings, led by scientists at Beth Israel Deaconess Medical Center (BIDMC), appear in tomorrow's issue of The New England Journal of Medicine (NEJM).

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