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According to Biogen Idec, a tenth confirmed case of progressive multifocal leukoencephalopathy (PML, a viral infection of the brain that usually leads to death or severe disability) has occurred among people who have used Tysabri (natalizumab, Biogen Idec and Elan Pharmaceuticals) after it became available for prescription in July 2006.
To read more, as reported by the US National MS Society, click here.
Source: US National MS Society
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