Where are those unsanitary connditions going on? Too many too list. Just last month I had to go to the doctor to get an eye antibiotic for an infection that comes specifically, from exposure to dirty sheets. Incubation time takes 3-5 days I got it the 3d day. It was the first question I was asked, " did you place your head on a dirty towel, sheet, or bed linen"?
Sir, just because you haven't been to a place where that was true, based on your individual experience, does not mean it is not true, in the antithesis, it means it is not true for you, based on your personal experience . Try to consider that you experiences are individualized not gospel.