Here are some suggested online starting points. You can find a list of passwords here:
In what ways did the medical services during the war improve services afterwards?
How did patient treatment change after the war, and why?
What medical conditions (physical / mental) came to be recognized due to the war?
Did doctors use any medical war knowledge in treating new disease?
What new approaches were used to try to combat the influenza epidemic?
How did the concept of public health grow based on this flu & TB epidemics?
Compare responses in two different nations to the influenza epidemic.
How did residual feelings about "the enemy" influence the treatment of influenza?