The population in question could be as small as a handful of people or as giant as all of the inhabitants of a quantity of continents . Public health has many sub-fields, but sometimes includes the interdisciplinary categories of epidemiology, biostatistics and health companies. Environmental health, group health, behavioral health, and occupational health are additionally important areas of public health. From historical instances, Christian emphasis on sensible charity gave rise to the development of systematic nursing and hospitals and the Catholic Church today remains the biggest non-government supplier of medical providers on the earth. This is intended to ensure that the entire inhabitants has entry to medical care on the basis of need somewhat than capability to pay. Delivery may be via personal medical practices or by state-owned hospitals and clinics, or by charities, most commonly by a mixture of all three.
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