John Snow's investigation of the 1848 cholera epidemic in London was an example of which type of research study?

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John Snow's investigation did not involve manipulating any variables, making it a quasi-experiment rather than a randomized clinical trial. It was also not a cross-sectional study because it involved following individuals over time rather than taking a snapshot of a population at a certain point in time. Lastly, while Snow did look back at past cases to gather information, his investigation was primarily focused on the current outbreak, so it was not a retrospective study.

John Snow's Investigation of the 1848 Cholera Epidemic in London