Hi, I'm Influenza A. I like to infect people with a virus commonly known as the flu. If you are in school, and people around you have the flu, you will more likely then not catch me also if you don't follow the correct ways to not get sick.
The inside of your body is like a war zone. I try to infect your cells with more viruses and your immune system fights back.
I find many entrance points to get into your body. One includes the skin. I sit on your skin till you ingest me or touch your eyes or nose. To stop me, people wash their hands and use hand sanitizer. They keep their skin as clean as can be.
People also try to prevent getting me by getting a shot. This shot contains a dead virus just like me. They do this so your body can fight me off with the right tools when I come.
It starts in your nose! Your nose hairs prevent me from getting into your body through the air. I get caught on them and can't go in! But if I get past you may get sick.
That circle is the natural mucus your body makes to also help fight me off. The mucus has the right tools to keep me maintained enough so I can't get you sick.