Polyomavirus JC, multiple sclerosis, Tysabri, and an anti-malaria drug

Biogen has announced that an anti-malaria compound may be useful for treating a brain infection, progressive multifocal leukoencephalopathy (PML), that is an adverse effect of the company’s multiple sclerosis/Crohn’s disease drug Tysabri. How does JC virus fit into this story? Tysabri is the trade name for Natalizumab, a monoclonal antibody against the cellular protein alpha-4 integrin. …

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