Infusions of antibody-rich blood plasma from people who have recovered from the coronavirus, so-called convalescent plasma, failed to make a difference in a study of hospitalized patients in China, researchers reported on Wednesday in the Journal of the American Medical Association. In a randomized trial involving 103 COVID-19 patients, convalescent plasma made no difference in the time it took to show signs of improvement or in rates of death at 28 days versus a placebo. There were some potentially encouraging results among patients who were "severely ill" but not sick enough to be in the intensive care unit.
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