How do vaccines actually work?
I know vaccines prevent diseases but I don't understand how. How does giving someone a shot stop them from getting sick later? What's actually in a vaccine? Why do some vaccines need boosters? My understanding is they 'teach' the immune system somehow but I'd like to actually understand the process.
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Great question! The math behind this is complex but the concept is actually straightforward once you see it the right way. Forget what you learned in school for a moment and think about it from first principles.
3 Answers
Great question! The math behind this is complex but the concept is actually straightforward once you see it the right way. Forget what you learned in school for a moment and think about it from first principles.
I'm a physics grad student and this is one of my favorite questions to explain. The key insight is that our everyday intuition doesn't always apply at extreme scales — very small (quantum), very large (cosmological), or very fast (relativistic).
Be careful about 'common sense' here — a lot of science is counterintuitive. The whole point of doing experiments is that the universe often doesn't work the way our gut tells us it should. The Earth feels flat and stationary, after all.
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