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THE NEED FOR NEW METHODS TO STUDY COMPLEX PUBLIC HEALTH SYSTEMS What Are Complex Systems?Ĭomplex systems abound in public health. The purpose of this review is to present an argument for the utility of systems science methods in public health, to introduce three important and relevant systems science methods ( system dynamics, network analysis, and agent-based modeling), and to illustrate these methods through three case studies in which these methods have been used to answer important public health science questions in the areas of infectious disease, tobacco control, and obesity. However, systems science methods remain underutilized and are not featured prominently in public health curricula or training ( 137). Government, business leaders, and other stakeholders are already using public health systems science to guide national pandemic strategy, which highlights the utility and impact of these methods. This is a historical moment for public health science. The science base for these recommendations relies to a great extent on new types of methods for simulating and modeling complex systems ( 56). As part of this planning, BARDA has utilized the most current public health science to make decisions and recommendations about aspects of pandemic planning such as stockpiling and distribution of vaccines, the timing and targeting of vaccines, and the most effective use of nonmedical interventions such as social distancing (i.e., quarantines) ( 38). Part of BARDA's mission is to help prepare the national plan to address the threat of emerging infectious diseases such as pandemic influenza. In 2006 the United States established the Biomedical Advanced Research and Development Authority (BARDA), partly in response to the threat of a global H5N1 pandemic as well as the 9/11 terrorist attacks.

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