Well my mom is a doctor too, so nyaa! :P
And about the trenches quote: it looked like you were saying that you YOURSELF have been in trenches (I get that you mean I as in 1, but it still looks funny; you should have said WWI and II, or the World Wars). Anyway, disease was a pretty huge problem in the trenches, although when you have so many other factors such as lice and rats, contaminated food and water, extreme crowding, and so on, it's probably pointless to talk about cold at all in that context.
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