ELI5: Explain Like I'm 5

Anatomy of an Epidemic

Okay, imagine you and your friends are playing tag. One person starts off as "it" and tries to tag the others. When someone gets tagged, they become "it" too and join in the tagging. This is how an epidemic works in our bodies, but with germs instead of kids playing tag.

Our bodies have lots of different parts that help keep us healthy, like our immune system, which fights off germs. But sometimes, a new germ comes along that our bodies have never seen before, like the flu virus. Our immune system doesn't know how to fight it off right away, so the germ starts spreading in our body.

Just like in tag, once one person gets tagged, they can tag others and it spreads quickly. The same thing happens with germs in an epidemic. One person gets sick and then they can pass the germ on to others, who will get sick too. This can happen really fast and affect a lot of people.

But there are things we can do to stop an epidemic from getting worse. We can try to avoid contact with sick people, wash our hands frequently, and wear masks to stop germs from spreading. We can also get vaccines to protect ourselves from certain germs.

So, just like playing tag, an epidemic is when germs spread quickly from one person to another. But by following healthy habits, we can help stop the spread of germs and keep ourselves and others healthy.