Memory cells are important for our immune system after we get sick for the first time. When our body meets a germ, it creates special cells called memory T and B cells, which can live for a long time.

What Memory Cells Do:

1. Quick Reaction:

   • If the same germ attacks us again, these memory cells recognize it fast. This helps our immune system respond quicker and stronger.

2. Better Defense:

   • Memory B cells can make antibodies that are really good at fighting off germs. This means they can neutralize the germs more effectively.

Example:

• Think about the measles vaccine. After we get the vaccine, our body makes memory B and T cells. If we come into contact with the actual virus later, our immune system can respond much better, often stopping us from getting sick at all.

In short, memory cells are key for long-term protection. They help our body fight off germs we've met before, making sure we stay healthy.