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The key to multiple sclerosis (MS) could lie in the gut. Sufferers have levels of good and bad gut bacteria that are different to those of a healthy person, say researchers, and so may not be processing the goodness from foods properly.
The multiple sclerosis drug Tysabri (natalizumab) increases the risk of a fatal brain virus ten-fold. Progressive multifocal leukoencephalopathy (PML) is a rare disease that attacks the brain’s white matter—but it becomes more common when the immune system is compromised, as can happen when people take immunosuppressive drugs, say researchers.