BOSTON, June 29 (Reuters) - A 10th patient taking Biogen Idec Inc's Tysabri has developed a potentially deadly brain infection since the multiple sclerosis drug was reintroduced to the market in July ...
New research has confirmed a strong link between four genetic mutations and progressive multifocal leukoencephalopathy (PML), a rare but often fatal brain infection that can be triggered by dozens of ...
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