My Da earned a BS degree in Microbiology
later in Life. I helped him on his senior project,
growing Typhus. I did most the cultures.
I was 8 or 9 years old.
I'm not sure why a Lab Tech gets thousands of
dollars a year to grow stuff in a Petrie dish and
then make slides from the culture.
But that is Old school.
For the most part Carlin is right.
Except
You always wash after defecating.
You always wash after dealing with raw
foods and going on to something else.
Your mouth is the most filthy part of your body
wash after you floss.