Thousands of people received convalescent plasma as an experimental treatment for Covid. A new study shows that it works — but only when given within a few days of the onset of illness.
A small but rigorous clinical trial in Argentina has found that blood plasma from recovered Covid-19 patients can keep older adults from getting seriously sick with the coronavirus — if they get the therapy within days of the onset of the illness.
The results, published Wednesday in the New England Journal of Medicine, are some of the first to conclusively point toward the oft-discussed treatment’s beneficial effects. They arrive nearly five months after the Food and Drug Administration, under pressure from President Trump, issued the therapy an emergency green light for use in people hospitalized with Covid-19.
- New England Journal of Medicine: Early High-Titer Plasma Therapy to Prevent Severe Covid-19 in Older Adults