The image is a diagram illustrating the stages of the immune system. It shows the following stages:

1. **Infection**: The body detects an infection.
2. **Immune Response**: The immune system responds to the infection.
3. **Response to Infection**: The immune system reacts to the infection.
4. **Response to Infection**: The immune system continues to respond to the infection.
5. **Response to Infection**: The immune system completes its response to the infection.

The diagram uses a color-coded system to represent different stages of the immune response, with red indicating the initial detection of infection, green indicating the immune system's response, and yellow indicating the completion of the response.