Relating to the study of how diseases spread and can be controlled in populations. Concerning the patterns and causes of health conditions in communities.
From Greek 'epi' (upon) + 'demos' (people) + 'logos' (study), literally 'the study of what is upon the people.' The term was coined in the 19th century as public health became a scientific discipline.
Epidemiology is detective work on a massive scale - epidemiologists trace disease patterns through populations like detectives following clues, which is why John Snow's mapping of cholera in 1854 London is considered the birth of modern epidemiology.
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