It’s Not All About Antibodies

Some people who have not been exposed to SARS-CoV-2 may still have some immunity to it—and not because they have antibodies.
In a new study of adults who had not been exposed to the virus found that 35% of them had T cells—part of the immune system that help protect the body from infection—that reacted to the virus.
That immunity may come from previous infection with another endemic coronavirus.
Now, more questions: How do these “cross-reactive” T cells impact COVID-19 illness? Could they be the reason that children and younger adults tend to have milder illnesses?

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