immunology

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.
A long time ago, I saw a movie called "The Other Side of the Mountain." The movie told the story of Jill Kinmont, a ski racer who contracted polio and lost the use of her legs. I was sad for days for afterward, but also relieved to know that Jill Kinmont's fate wasn't going to be mine. I wasn't going to wake up in an iron lung after a ski race, and neither were my friends, because most of the children in my generation had been vaccinated against the Polio virus.

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