How do mRNA vaccines work to protect against viruses?

An mRNA vaccine is like giving your body a special message that helps it fight off viruses.

Imagine you're playing hide and seek, and someone tells you where to look, that’s kind of what an mRNA vaccine does. It gives your body the instructions to make a protein found on the surface of a virus, like the one that causes COVID-19. Once your body makes this protein, it learns how to recognize and fight the real virus if it comes along later.

The message inside the vaccine is made of something called mRNA, which stands for messenger RNA. It's a kind of instruction sheet that tells your cells what to do. When you get the vaccine, this mRNA goes into your body and gets read by your cells.

Your cells then use the instructions to build a copy of the virus’s protein. Once that protein is made, your immune system notices it and starts getting ready for battle, like training for a big game.

This means if you ever meet the real virus later on, your body already knows how to fight it because it practiced with the fake version from the vaccine. No need for a full-blown illness, just a head start in the game!