Being exposed to common colds might help to fight off COVID-19

Could we have some immunity to SARS-CoV-2 without ever having been exposed to it?

Some new studies found people who were never symptomatic, exposed to, or tested positive for COVID-19 have immune cells that can recognise and possibly kill virus-infected cells.

How is this possible? And what does it mean for our fight against COVID-19?

Many common colds are coronaviruses

There are seven known coronaviruses that can infect humans. Three

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