“I can think of a few microorganisms, possibly the tubercle bacillus, the syphilis spirochete, the malarial parasite, and a few others, that have a selective advantage in their ability to infect human beings, but there is nothing to be gained, in an evolutionary sense, by the capacity to cause illness or death. Pathogenicity may be something of a disadvantage for most microbes, carrying lethal risks far more frightening to them than to us. The man who catches a meningococcus is in considerably less danger for his life, even without chemotherapy, than meningococci with the bad luck to catch a man.”

— Lewis Thomas, book The Lives of a Cell: Notes of a Biology Watcher

"Germs"
The Lives of a Cell: Notes of a Biology Watcher (1974)

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Lewis Thomas31

American physician, poet and educator 1913–1993

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Lewis Thomas31

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