Assignment task: A friend of yours is mentioning that she has had the same illness twice within a year (proven by laboratory tests), but that the second time around was a lot less severe in signs and symptoms than the first time encountering the "bug". Since your friend knows you have studied immunology, she wants you to help her understand what has happened to lessen her symptoms. (Your friend has taken college-level general biology and anatomy & physiology, but no other advanced biology courses.)
In no particular order, explain/discuss the following topics. Organize your essay in the way that you feel best fits your flow of information while answering all of these required topics.
What background would you give your friend to help her understand the roles of our multi-layered, multi-faceted immune system and what happens when her body encounters any "bug"? Explain well.
What cells are critical to understanding this whole scenario and what specific role do each perform?
Compare primary and secondary antibody responses so your friend might see what has happened to lessen the symptoms and signs the second time around. (Hint: lag time, IgM and IgG serum titer changes, magnitude of response, etc.). Explain well.