No it is not a lack of hygeine. Bacteria is upiquitous.
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Yes, I know that bacteria are ubiquitous. But the article refers to these as enteric bacteria, which are found in the bowels, correct? So with proper hand-washing, especially after bathroom visits, shouldn’t one be unlikely to be infected?
It is not a fecal oral routing. In other words, these bacteria were not passed on from one to the other. Rather his natural bacteria became organism resistant (colonizaton happens even with perfect hygeine) and then his immune system fell apart to the point that these became opportunistic.