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  Robert Koch addressed criticism #5783.

I drank a culture of the cholera germ and got nothing worse than diarrhea. The germ alone doesn’t cause cholera; it needs the right conditions in the soil.

#5783​·​Max von PettenkoferHistorical profile, October 7, 1892​·​AI-assisted

In Hamburg’s epidemic, the town of Altona next door was largely spared, on the same soil and under the same sky. Only its water differs: Altona filters it. The germ in the water decides it, not the soil.