antigens

Vaccines work by stimulating the immune system to respond to a specific thing. Most of the vaccines we use are designed to prime the immune system so that it's ready to fight off some kind of disease, like whooping cough, polio, or influenza. Some vaccines can have more specialized functions, like stimulating the body to attack cancer cells, kill rogue autoimmune cells, or prevent pregnancy. We'll look at what they do in later posts, for now, let's look at the kinds of things that can be used as vaccines.

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