Public health is the study and practice of addressing threats to the health of a community. The field pays special attention to the social context of disease and misery, and focuses on improving health through society-wide measures like vaccinations or the fluoridation of drinking water. The goal of public health is to improve lives through the prevention or treatment of disease. The United Nations' World Health Organization defines health as "a state of complete physical, mental and social well-being and not merely the absence of disease or infirmity." In 1920, C.E.A. Winslow defined public health as "the science and art of preventing disease, prolonging life and promoting health through the organized efforts and informed choices of society, organizations, public and private, communities and individuals."

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