World Health Organization WHO
The population in question can be as small as a handful of people or as large as all the inhabitants of several continents . Public health has many sub-fields, but typically includes the interdisciplinary categories of epidemiology, biostatistics and health services. Environmental health, community health, behavioral health, and occupational health are also important areas of public health. Primary care medical services are provided by physicians, physician assistants, nurse practitioners, or other health professionals who have first contact with a patient seeking medical treatment or care. These occur in physician offices, clinics, nursing homes, schools, home visits, and other places close to patients.
- Public health has many sub-fields, but typically includes the interdisciplinary categories of epidemiology, biostatistics and health services.
- Healthy People Learn about Healthy People, the initiative that sets national objectives to help improve health and well-being for all people.
- Mental illnesses are the leading cause