- Explain why you can catch a cold or a flu more than once, but you become immune to chicken pox after you get it once.

- What is a vaccine? How do they work?

- What are the key cells involved in your immune response and how do they work? (Macrophanges, lymphcytes, B-cells, T-cells)

- What is the difference between passive immunity and active immunity?

- What are some universal ways that we can protect ourselves from pathogens?

Thank you very much!