Yes. Legionellosis is a cause of T-Lymphocytopenia.
Legionellosis Legionella pneumophila (gram negative bacterial infection by any species of Legionella including Legionnaire's disease, which is characterized by high fever, malaise, muscle aches, respiratory disorders and headache) wikipedia.
T-Lymphocytopenia Idiopathic CD4+ lymphocytopenia, a depletion of CD4+ lymphocytes below 300 per cubic millimeter, or less than 20% of total lymphocytes, in the absence of HIV infection or other known causes of immunodeficiency wikipedia.
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.