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Tests for the immune response to the coronavirus are revealing thousands of people who were infected but never got severely ill. The findings suggest the virus is less deadly than it first appeared.
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As more and more people get tested for antibodies to the coronavirus, infectious disease specialists worry that those tested — and their employers — may not understand the limits of the results.
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The country has been testing on a larger scale than most other countries. Studying antibodies in the blood can show whether someone has fought off the virus.
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Antibody tests to detect past exposure to the coronavirus will soon be everywhere. But even the best ones can provide wrong answers surprisingly often — and give false assurance.