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Community Medicine: Is the science that concerns with the promotion of health, prevention, control, and management of diseases, disabilities, and other health problems in the community.
It is the branch of medicine that deals with community rather than individual. Public Health: Is the combination of sciences, skills, and beliefs directed toward maintenance and improvement of health of all people through collective or social actions. The mission of Public Health is to assure conditions in which people can live healthy. Its efforts are organized by comprehensive activities of society. The society must balance illness care with wellness care in order achieve definition of health "Complete physical, mental and social wellbeing and not merely the absence of disease or infirmity-WHO 1948". Then add spiritual, and in recent years the statement is amplified to include the ability to lead a socially and economically productive life.

Aims of Preventive Medicine Specialty

1. Promote and preserve health and longevity in individuals and community by adoption of healthy life style and health education.
2. Prevent and limit diseases, injuries, and other ill health effects.
3. Enhance quality of health care system and assure that all populations have access to appropriate and cost effective care.
4. Use epidemiology to assess and monitor the health of communities and populations at high risk to identify health problems. Prevention: Is the anticipatory action taken to reduce the possibility of an event or condition occurring or developing, or to minimize the damage that may result from the event or condition if it does occur.

Prevention may take place at any point along the spectrum of the disease, from the prevention of the disease or injury to the prevention of impairment, disability or dependency.