Section 1: Public Health and Public Health Practices/InvestigationsPublic health is the discipline and skill of preventing disease and injury, prolonging life, and ensuring well-being through structured public work and control of communicable diseases. , the union of medical and nursing establishments for the rapid identification and prevention of diseases, the teaching of individual health and to ensure a standard of living suitable for the preservation of health (Breslow et al, 2002). Public health focuses on population health. completely than the treatment of individuals (Beaglehole et al, 2004). Public health principles are intended for the public and other institutions that have a public health mission. Individuals and institutions that are not part of the traditional public health sector but whose activities impact the health community find the code useful. The principles are used to recognize the causes of risk and demonstrate the association between the three aspects that affect the incidence and prevention of diseases. These factors are: the host, or person or population affected by the disease; Agent or organism causing the disease; and Environment, or location in which the host and agent interact. Understanding the incidence of the disease is not enough to address preventive methods. The strategy must be comprehensive at three levels. Primary: The goal is to avoid procedures that may result in illness/injury, which can be done to prevent illness/injury before the incident occurs. Secondary: The goal is to change the meaning of events in order to avoid or reduce the severity of an illness or injury. Tertiary: The objective is to limit damage and long-term disability. Passive strategies do not require any assistance or action in the middle of the document......es, pp. 1-66.Jamison, DT 2006, World Bank and Disease Control Priorities Project, Disease Control Priorities in Developing Countries, New York: Oxford University Press. Lee, LM, Teutsch, ST, Thacker, SB and St. Louis, ME 2010, Ethics in public health surveillance, principles and practices of public health surveillance, pp.1-22Nsubuga, P, White, ME, Thacker, SB, Anderson, MA, Blount, SB, Broome, CV, Chiller, TM, Espitia, V, Imtiaz, R, Sosin, D, Stroup, DF, Tauxe, RV, Vijayaraghavan, M & Trostle, M 2006, Surveillance Public Health: A Tool for Targeting and Monitoring Interventions, Disease Control Priorities in Developing Countries, 2nd Edition, pp. 995-1016Public Health Leadership Society, 2002, Principles of Ethical Public Health Practice, version 2.2, pp. 995-1016. 1-16Smith, P & Hepple, B 2007, Public Health: Ethical Issues, London: Cambridge Publishers ltd.