Why Do We Get Sick From Other People?

Imagine your body is a cozy castle. Bacteria and viruses are like tiny, grumpy invaders trying to get inside to steal your snacks (your energy). When you shake hands or share air with someone else, these little invaders hitch a ride on them.

Sometimes an invader jumps from one person to another through the air when they sneeze. Other times, they walk across your skin like tiny crabs when you touch something dirty. Your castle has guards called white blood cells who chase the invaders away if they are strong enough.

If too many invaders get in at once, or if your guards are tired from playing all day, they win the battle and you feel sick. It is like a game of tag where the germs pass the sickness ball to you.

Washing your hands is like putting up a net to catch the crabs before they climb into your castle. Staying away from sneezing people keeps the air clear of flying invaders.