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Sunwal is a municipality in Nawalparasi District in the Lumbini Zone of southern Nepal. It was recently announced as a municipality combining two neighboring Village Development Committees; Sunwal and Swathi; of the district (by means of financial plan for the fiscal year 2011-2012 on July 16, 2011). At the time of the 2011 Nepal census it had a population of 39846 people living in 8639 individual households. Swathi alone has population of 10629 with 2102 individual house holds.

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Public health is "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."It is concerned with threats to health based on population health analysis. The population in question can be as small as a handful of people, or as large as all the inhabitants of several continents (for instance, in the case of a pandemic). The dimensions of health can encompass "a state of complete physical, mental and social well-being and not merely the absence of disease or infirmity", as defined by the United Nations' World Health Organization.Public health incorporates the interdisciplinary approaches of epidemiology, biostatistics and health services. Environmental health, community health, behavioral health, health economics, public policy, insurance medicine and occupational safety and health are other important subfields.