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COVID-19 (coronavirus) in babies and children

Why do children react differently to COVID-19?

The answer isn't clear yet. Some experts suggest that children might not be as severely affected by COVID-19 because there are other coronaviruses that spread in the community and cause diseases such as the common cold. Since children often get colds, their immune systems might be primed to provide them with some protection against COVID-19. It's also possible that children's immune systems interact with the virus differently than do adults' immune systems. Some adults are getting sick because their immune systems seem to overreact to the virus, causing more damage to their bodies. This may be less likely to happen in children.