Today I learned that while blood is normally sterile, you get bacteria in your bloodstream every time you brush your teeth.
This is not the sort of thing I want to be clued into. The rational part of me knows that our immune systems are probably good enough to handle the onslaught of blood-borne bacteria twice a day, so nobody ever dies of “sepsis, c/w tooth-brushing.”*
But the rest of me still doesn’t like it.
But I do like this slide, which our course director included in her lecture to demonstrate one reason why microbiology is important: