Which factor assisted Dr.John Snow's epidemiological determination that cholera was occurring as a common source outbreak?

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All of the factors listed assisted Dr. John Snow's epidemiological determination that cholera was occurring as a common source outbreak. He was able to limit access to the contaminated water pump he determined responsible for disease spread, his investigation began relatively soon after the first cases were seen, he had comparable non-infected sources as a comparative base, and water access for most individuals was localized.

Which Factor Assisted Dr