Here's a breakdown:
* Natural: This means the immunity develops naturally in the body, without any deliberate intervention.
* Active: This means the body actively produces its own antibodies and immune cells in response to the disease.
Here's how it works:
1. Exposure to the disease: You get sick with a specific disease (like the flu or chickenpox).
2. Immune response: Your immune system identifies the pathogen (virus, bacteria, etc.) as foreign and mounts an attack.
3. Memory cells: Your immune system develops memory cells that "remember" the pathogen.
4. Future protection: If you encounter the same pathogen again, these memory cells quickly recognize and destroy it, preventing you from getting sick or reducing the severity of the illness.
Example: If you get chickenpox as a child, your immune system develops immunity against the varicella-zoster virus, making you less likely to get it again.
