ELI5: How does mRNA fight germs?

mRNA doesn't directly fight germs; it teaches our body how to make tools to fight them.

Imagine your body is like a castle that needs to defend itself against invaders (germs).

• The invaders have a special uniform (a specific protein).
• Your body needs a picture of that uniform to train its soldiers (immune system) to recognize and attack the invaders.

• Think of mRNA as a recipe card. It's a set of instructions.
• The recipe card tells your body how to make a "wanted poster" of the invader's uniform. This "wanted poster" is a protein specific to the germ.

• Scientists create an mRNA recipe card for a specific part of the germ (like that uniform).
• This mRNA recipe card is injected into your body (like getting a shot).
• Your body's cells read the mRNA recipe card.
• Your cells then start making copies of the "wanted poster" protein.
• These "wanted poster" proteins are shown to your immune system.
• Your immune system learns to recognize this protein and create special weapons (antibodies) to attack it.
• Now, if the real invader (the germ) ever shows up, your body is ready with its weapons to defeat it quickly!