There was a perceptible shift away from miasma and toward contagion theories in the 1850s and 1860s, due in part to these events. Many doctors, however, remained unconvinced. Snow’s investigations in particular still didn’t suggest a plausible mechanism for the transmission of the disease. His conclusions correlated cholera with contaminated drinking water. But, like other contagionists, Snow didn’t explicitly state what it was that was being transmitted through that water. Was it an animalcule? Or a poisonous chemical? If the latter, wouldn’t it be infinitely diluted in large bodies of water
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