The population in question may be as small as a handful of people or as large as all of the inhabitants of a quantity of continents . Public health has many sub-fields, however usually contains the interdisciplinary classes of epidemiology, biostatistics and health companies. Environmental health, group health, behavioral health, and occupational health are also essential areas of public health. Clinical practitioners focus primarily on the health of individuals, whereas public health practitioners think about the overall health of communities and populations.
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