How does the immune system protect the body?

The body's immune system is a surveillance system that helps the body recognize "self" from "notself," attacking and destroying whatever it perceives to be notself, whether that happens to be an invading virus or one of the body's own cells that has begun dividing uncontrollably as a cancer. The body's immune system has several lines of defense, including T-lymphocytes (or T-cells) and B-lymphocytes (B-cells), which protect against a number of viral, bacterial, and parasitic infections. An additional line of defense is provided by cells called natural killer (NK) cells, which are capable of killing a wide variety of targets, including tumor cells.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.