Just heard this from a scientist on NPR. There are ten times as many bacteria and virus cells in your body as there are human cells. You are a germ civilization.
More than 50% of your excrement is dead bacteria. Indeed not only are germs everywhere, but it would be much harder to digest food without them.
Depending on how you measure success they are also the most successful life forms, they are by far and away the most diverse and fecund group of organisms on the planet, existing everywhere from arctic wastelands to volcanic vents at the bottom of the ocean, with millions of different species.
That was an interesting read, I didn’t know half of that.