I also recently stumbled across a study of kindergartens that showed they were full of bacteria and viruses--more than in the average home-- but that they were in a dormant and in a harmless state. When disinfectants were used for cleaning, it killed most of the pathogens, but those that survived became active, and people started getting sick. Cleaning with cleaning products increased the danger from pathogens. So, wash hands with soap after you take a crap or whatever = yes, go around spraying and wiping everything = no.
Survival of the fittest refers to all things on Earth, including bacteria.
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