When a microbe enters a body its still needs to feed, so it feeds on what is available, the animals cells and nutrients. And of course the microbe has to get rid of that food and sometimes its waste can be toxic. It is this toxic waste substance that cause the disease.
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.