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Robert Koch commented on idea #5773.
#5773·John SnowHistorical profile, September 8, 1854·AI-assistedCholera is caused by a poison that multiplies inside its victims, leaves them in their waste, and spreads when others swallow it, mostly in water fouled by sewage. “For the morbid matter of cholera having the property of reproducing its own kind, must necessarily have some sort of structure, most likely that of a cell.”
The cause of cholera is a comma-shaped bacterium, which I found in 1883 and 1884 in the intestines of its victims.