The Covid-19 Plasma Boom Is Over. What Did We Learn From It?
The U.S. government invested $800 million in plasma when the country was desperate for Covid-19 treatments. A year later, the program has fizzled.
By the fall, accumulating evidence was showing that plasma was not the miracle that some early boosters had believed it to be. In September, the Infectious Diseases Society of America recommended that plasma not be used in hospitalized patients outside of a clinical trial. (On Wednesday, the society restricted its advice further, saying plasma should not be used at all in hospitalized patients.) In January, a highly anticipated trial in Britain was halted early because there was not strong evidence of a benefit in hospitalized patients.
In February, the F.D.A. narrowed the authorization for plasma so that it applied only to people who were early in the course of their disease or who couldn’t make their own antibodies.
Dr. Marks, the F.D.A. regulator, said that in retrospect, scientists had been too slow to adapt to those recommendations. They had known from previous disease outbreaks that plasma treatment is likely to work best when given early, and when it contained high levels of antibodies, he said.
“Somehow we didn’t really take that as seriously as perhaps we should have,” he said. “If there was a lesson in this, it’s that history actually can teach you something.”
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