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How does the COVID-19 vaccine work?

Is it possible to explain it in layman's terms? I'm really curious to understand more about it.


The platform of these vaccines (RNA) is, in my opinion, really compelling because there are lower risks for off target effects and it allows the body to recognize the vaccine more similarly to how it would a real infection compared to 'classical' vaccine modalities, which suggests they may be more effective in achieving long-lasting immunity--you would not be able to spread virus to others after you get a protective immune response following vaccination.