What we know about COVID-19 antibodies -- and what we don't
Clip: 05/22/2020 | 6m 35s | Video has closed captioning.
Scientists say antibody testing could be a key tool in the fight against the novel coronavirus. Still, many questions remain about the accuracy of antibody testing. The Food and Drug Administration has tried to crack down on inaccurate tests, but scientists aren’t even sure yet what a positive test means for immunity. John Yang reports.
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