Prognosis

New Antibody Tests Offer Better Snapshot of Covid-19 Immunity

Tests from Siemens Healthineers, Roche help with vaccine push
Tools can help chart rise and fall of long-lasting antibodies

A worker collects a sample for a Covid-19 antibody test in Los Angeles, on Aug. 5. — A worker collects a sample for a Covid-19 antibody test in Los Angeles, on Aug. 5.
Photographer: Patrick T. Fallon/Bloomberg

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By Tim Loh

August 21, 2020 at 11:30 PM UTC

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A new crop of Covid-19 antibody tests measures the level of protection someone has built up against the deadly virus and may help determine which vaccines are most effective.