Tysabri: The Risk of Revival

Biogen Idec brilliantly convinced FDA's advisory experts to let the multiple sclerosis drug back on the market. FDA and the drug industry should prepare for the worst. One projection has 100,000 patients eligible for the immunosuppressant once it returns to the market. If there's significant penetration of that population, the drug's discoverer says it could be the setting for a public health disaster.