ELI5: How does mRNA technology work

mRNA technology works by giving your body's cells instructions to make a specific protein, like teaching them how to build a special tool.

Imagine your body is a big factory that makes all sorts of things. Normally, the boss (your DNA) stays locked in their office (the nucleus) and sends out messages (called mRNA) to the workers (your cells) telling them what to make.

• Think of mRNA as a recipe card. It’s a short, temporary instruction sheet.
• Normally, your cells use these recipe cards to make all the proteins they need.

• This new recipe card tells your cells how to make a harmless piece of the bad guy (like a picture of the bad guy's shield, not the whole bad guy).
• Your cells follow the recipe and make this harmless piece.
• Your body sees this piece and says, "Hey, that looks like something bad! I need to learn how to fight it!"
• Your body then builds its own real shields (antibodies) that are specifically designed to fight that bad guy.
• Now, if the real bad guy ever shows up, your body already knows how to defend itself because it has the right shields ready!