There were more deaths from disease than bullets, but dysentary is kind of a catch all word ford dying of diarria, often it is water borne. Food poisning will also cause ya ta die of diarria. I am trying to remember the sources on this but I have seen it stated several times, in information on the early health laws, I think this information was kept from the soldiers and general public least the Chicago packing district started to sprout bodies hanging in trees and from light posts, bodies wearing suits.
From what I have heard about the conditions there I don't doubt this statement. This is discounting some of Upton Sinclars book, cause he was a reforming Socialist and tend to exagerate a bit. No doubt though something happened to cause laws to be passed rather quickly.
Incedently by WWI American Corned beef was prized by hungary German troops in France, who are said to have often "went over the top " ta raid American treches fer it.