Do Childhood Colds Help the Body Respond to COVID?

Do Childhood Colds Help the Body Respond to COVID?
(AP Photo/David Zalubowski)

Some people are better at fighting off seasonal flu when the strain of influenza virus is similar to the first one they encountered in childhood — a phenomenon evocatively dubbed ‘original antigenic sin’, or OAS. Now, there is increasing evidence that people’s immune responses to COVID-19 could be shaped in a similar way by previous infections with common-cold coronaviruses.

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