Shares of Biogen Idec sank Monday after the biotechnology giant confirmed that another patient taking the multiple sclerosis drug Tysabri has been diagnosed with a potentially fatal brain infection called progressive multifocal leukoencephalopathy, or PML.

The patient, who lives overseas and had been taking Tysabri for more than 30 months, is the 10th person to come down with PML since the multiple sclerosis drug was allowed back onto pharmacy shelves in 2006. Three of those cases have been diagnosed this month.

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