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Epidemiology is a population's health science. It utilizes a population approach for the study of the distribution (person, place, and time) and determinants (biological, social) of health and disease in defined populations of varying characteristics, and how to use the information for the prevention and control of various health problems.

The term epidemiology is of Greek origin and can be roughly translated as the study among or upon people. The origins of epidemiology can be traced back to the era of Hippocrates, when the idea that environmental factors (seasons, winds, hot, cold) can influence disease occurrence was in circulation. However, epidemiology's development into a full-fledged discipline excelled in the 19th century with the work of John Snow, on which identified the relation between drinking water supplied ...

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