What coronavirus antibody tests tell us — and what they don’t

Widespread testing could reveal who has had COVID-19, but not whether they’ll get it again

Antibody test

To get a better handle on how far the coronavirus has spread, researchers are developing blood tests to detect antibodies in people who were previously infected (one from Mirimus, Inc., shown). But such tests don’t indicate whether those antibodies can protect against future COVID-19 infections.

Misha Friedman/Stringer/Getty Images News

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