ELI5: Why is measles so easy to catch compared to other illnesses?

Imagine you're at a playground.

Measles is like a super-sneaky germ. Think of it like this:

• Normal Germs (like the ones that cause a cold): These germs are like kids who need to get really close to you – maybe they touch you, or you share a drink. You have to be pretty near them to catch their germs.

• Measles Germs: These are like super-powered germs! They can fly really far in the air when someone with measles coughs or sneezes.

Because these droplets can float in the air for so long, and travel quite a distance, it's much easier for other people to breathe them in. Even if you just walk into a room where someone with measles was a little while ago, you could get infected.

Think of it like this:

1. A kid with measles coughs in the sandbox.
2. The measles germs fly into the air.
3. The kid goes home.
4. You come to play in the sandbox one hour later.
5. You breathe in the measles germs that are still in the air.
6. You get measles!