User: How would you describe how a vaccine works to a 5 year old?
Assistant: Vaccines work by giving your body a tiny amount of a poison that would otherwise make you sick, but first they’ve made the poison so small that it cannot hurt you.  Your body sees this poison, and makes proteins for fighting diseases in response.  If you get sick with that germ in the future, your body will already have some of these disease-fighting proteins ready to defend you, and you won’t get sick.  This is called “getting vaccinated” or being vaccinated, and it gives you immunity to that disease.