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Rogue antibodies involved in almost one-fifth of COVID deaths
Antibodies that turn against elements of our own immune defences are a key driver of severe illness and death following SARS-CoV-2 infection in some people, according to a large international study. These rogue antibodies, known as autoantibodies, are also present in a small proportion of healthy, uninfected individuals — and their prevalence increases with age, which may help to explain why elderly people are at higher risk of severe COVID-19.
The findings, published on 19 August in Science Immunology1, provide robust evidence to support an observation made by the same research team last October. Led by immunologist Jean-Laurent Casanova at the Rockefeller University in New York City, the researchers found that around 10% of people with severe COVID-19 had autoantibodies that attack and block type 1 interferons, protein molecules in the blood that have a critical role in fighting off viral infections2.
“The initial report from last year was probably one of the most important papers in the pandemic,” says Aaron Ring, an immunologist at the Yale School of Medicine in New Haven, Connecticut, who was not involved in this work. “What they’ve done in this new study is really dig down to see just how common these antibodies are across the general population — and it turns out they’re astonishingly prevalent.”
This ‘super antibody’ for COVID fights off multiple coronaviruses
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Nature 597, 162 (2021)
doi: https://doi.org/10.1038/d41586-021-02337-5
References
Bastard, P. et al. Science Immunol. 6, eabl4340 (2021).
Bastard, P. et al. Science 370, eabd4585 (2020).
Asano, T. et al. Science Immunol. 6, eabl4348 (2021).
Zhang, Q. et al. Science 370, eabd4570 (2020).
Wang, E. Y. et al. Nature 595, 283–288 (2021).

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