Germs Nicer than Americans
This is old news but it's the first I heard of it. I found it in Jeanette Farrell's Invisible Allies: Microbes that Shape our Lives (2005)
According to the "1941 Census of Bacteria in the United States," scientists estimated the number of good or neutral bacteria in the U.S. as 10,031,000 quintillion, vs. 308 quintillion bad ones.
This works out to one disease-causing bacteria to every 29,999 good or neutral ones.
Compared to humans in the U.S. at the same time, 7,569 people were convicted of murder, which comes to one killer per 17,000 humans. Based on these numbers, bacteria are twice as nice as people.