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Global health is fashionable. It provokes a great deal of media, student, and faculty interest, has driven the establishment or restructuring of several academic programmes, is supported by governments as a crucial component of foreign policy,1 and has become a major philanthropic target. Global health is derived from public health and international health, which, in turn, evolved from hygiene and tropical medicine. However, although frequently referenced, global health is rarely defined. When it is, the definition varies greatly and is often little more than a rephrasing of a common definition of public health or a politically correct updating of international health. Therefore, how should global health be defined?
Global health can be thought of as a notion (the current state of global health), an objective (a world of healthy people, a condition of global health), or a mix of scholarship, research, and practice (with many questions, issues, skills, and competencies). The need for a commonly used and accepted definition extends beyond semantics. Without an established definition, a shorthand term such as global health might obscure important differences in philosophy, strategies, and priorities for action between physicians, researchers, funders, the media, and the general public. Perhaps most importantly, if we do not clearly define what we mean by global health, we cannot possibly reach agreement about what we are trying to achieve, the approaches we must take, the skills that are needed, and the ways that we should use resources. In this Viewpoint, we present the reasoning behind the definition of global health, as agreed by a panel of multidisciplinary and international colleagues.
Public health in the modern sense emerged in the mid- 19th century in several countries (England, continental Europe, and the USA) as part of both social reform movements and the growth of biological and medical knowledge (especially causation and management of infectious disease).2 Farr, Chadwick, Virchow, Koch, Pasteur, and Shattuck helped to establish the discipline on the basis of four factors: (1) decision making based on data and evidence (vital statistics, surveillance and outbreak investigations, laboratory science); (2) a focus on populations rather than individuals; (3) a goal of social justice and equity; and (4) an emphasis on prevention rather than curative care. All these elements are embedded in most definitions of public...