President Trump and the heads of the FDA and the Department of Health and Human Services all said on Sunday that plasma donated by former coronavirus patients has reduced deaths by 35%. Their calculation appears to be based on a small subgroup of hospitalized COVID-19 participants in a Mayo Clinic study — patients who were younger than 80 years old, not on ventilators and who received plasma that contained high levels of antibodies within 3 days of diagnosis, according to a report by the New York Times.
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