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Some people have IgG antibodies that recognize the coronavirus that causes COVID-19.

Antibodies to SARS-CoV-2: Are Some People Already Immune?

Some people have antibody profiles that could indicate repeat exposures or existing immunity to COVID-19.

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The red protein is the spike (S) protein on the SARS-CoV-2 coronavirus.
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Types of antibodies. The heavy chain is shown in purple and the light chain in green. [Credit: OpenStax College / CC BY (https://creativecommons.org/licenses/by/3.0)]

Ph.D. scientist with a passion for scientific communication and > 20 years editorial experience

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