We’ll soon be able to tell whether you are immune to covid-19

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An artist’s depiction of SARS-CoV-2 among human cells

Credit: National Institute of Allergy and Infectious Diseases, NIH

WE ARE getting closer to answering one of the most important remaining questions in the pandemic: how can we quickly test whether somebody is immune to the virus?

This elusive measurement of immunity is known as the correlate of protection: a simple, surrogate appraisal of the entire immune response that tells you whether somebody is protected against disease or infection. “So, for example, you measure the number of antibodies in blood and find that if you have a specific number you are …

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