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epidemiology. the science concerned with the study of the factors determining and influencing the frequency and distribution of disease, injury, and other health-related events and their causes in a defined human population for the purpose of establishing programs to prevent and control their development and spread.
Etymology[edit] Epidemiology, literally meaning the study of what is upon the people, is derived from Greek epi, meaning upon, among, demos, meaning people, district, and logos, meaning study, word, discourse, suggesting that it applies only to human populations.