Articles on Immunity passports

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It’s not yet clear whether antibodies in the blood of patients who have been infected with SARS-CoV-2 indicate immunity. Above: blood specimens for COVID-19 antibody tests. (AP Photo/Mary Altaffer)

Can antibody tests tell us who is immune to COVID-19?

Immunity to COVID-19 may be complicated. Here are the promises and pitfalls of antibody tests.

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