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COVID-19 vaccines for kids: What you need to know

How does the Pfizer-BioNTech COVID-19 vaccine work?

The Pfizer-BioNTech COVID-19 vaccine uses messenger RNA (mRNA). Researchers have been studying mRNA vaccines for decades.

Coronaviruses have a spikelike structure on their surface called an S protein. COVID-19 mRNA vaccines give instructions to immune cells for how to make a harmless piece of an S protein. After vaccination, cells begin making the protein pieces and displaying them on cell surfaces. The immune system recognizes the protein and begins building an immune response and making antibodies. Once the protein pieces are made, the cells break down the instructions and get rid of them.

The mRNA in the vaccine doesn�t enter the nucleus of the cell, where DNA is kept.