The World Health Organization on Monday was cautious about endorsing the use of recovered Covid-19 patients' plasma to treat those who are ill, saying evidence it works remains "low quality" even as the United States issued emergency authorization for such therapies.
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So-called convalescent plasma, which has long been used to treat diseases, has emerged as the latest political flashpoint in the race to find therapies for Covid-19.
The U.S. Food & Drug Administration (FDA) on Sunday authorized its use after President Donald Trump blamed the agency for impeding the roll-out of vaccines and therapeutics for political reasons.
The technique involves taking antibody-rich plasma from patients who have recovered from Covid-19 and giving it to those who are suffering from severe active infections in hopes they will recover more quickly.
Soumya Swaminathan, WHO chief scientist, said only a few clinical trials of convalescent plasma have produced results, and the evidence, at least so far, has not been convincing enough to endorse it beyond use as an experimental therapy. While a few trials have shown some benefit, she said, they have been small and their data, so far, inconclusive.
"At the moment, it's still very low-quality evidence," Swaminathan told a news conference. "So we recommend that convalescent plasma is still an experimental therapy, it should continue to be evaluated in well-designed randomised clinical trials."
Evidence is conflicting: One Chinese study showed plasma from people who have recovered from coronavirus failed to make a difference in hospitalized patients, while another, pooled analysis showed it can loweRead More – Source