| President Trump plans to announce the emergency authorization of convalescent plasma for covid-19, a treatment in broad use that already has been given to more than 70,000 patients, according to officials familiar with the decision. The blood product is derived from patients who have survived covid-19. Many scientists and physicians believe that convalescent plasma might provide some benefit but say it is far from a breakthrough. The issuance of an emergency authorization would make it easier to get in some settings. But former FDA commissioner Scott Gottlieb said it already is widely available, so the change would be "incremental." | 
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