Vaccines work by inducing an immune response to a protein on the surface of a pathogen, such as a virus or a tumor.
mRNA vaccines are small molecules that contain the blueprint for the production of these surface proteins.
The mRNA is used to make the target protein, which triggers an immune response and the production of antibodies.
When the immune system is exposed to the virus, antibody production is faster than in a naive immune system.
Because mRNA is rapidly degraded, it is quickly cleared from the body. 
In addition, the human body is not able to insert mRNA into its genome, so the DNA is not affected by the vaccination.
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