Within the UK there are four public health systems covering each of four countries making up the UK: England is the largest country, followed by Scotland, Wales, and Northern Ireland. There are many commonalities between the systems in terms of their functions and workforce terms and conditions as well as the challenges each faces. But in keeping with the devolved systems of government enjoyed by each country, the public health systems are organized differently and their structures and priorities reflect the differing contexts in which they are located. Drawing on the three domains outlined by Griffiths, Jewell, and Donnelly in their seminal 2005 paper and comprising health protection, health improvement, and health service delivery and quality, UK public health systems exist to protect and promote health improvement and well-being in the population and do so through devising policies and strategies and providing services as well as contributing to the evidence base in regard to what works to improve health. The definition of a public health system is clearly contingent on the definition and scope of public health. The UK public health systems have adopted the definition of public health advanced by the UK Faculty of Public Health and other bodies and first produced by a former Chief Medical Officer for England, Sir Donald Acheson, in 1998: “Public health is the science and art of preventing disease, prolonging life and promoting health through organised efforts of society.” A slightly extended version appeared in a review of public health carried out for the UK government by its appointed independent adviser, Sir Derek Wanless, in 2004: “Public health is the science and art of preventing disease, prolonging life, and promoting health through the organised efforts and informed choices of society, organisations, public and private, communities and individuals.” These definitions share important characteristics including: public health is both a science and an art, essentially and always a combination of knowledge and action; the core purposes of public health are to prevent disease, prolong life, and promote health; public health is an organized societal function. Several aspects of these definitions can be highlighted as being especially pertinent to public health systems. Notable among these is the desire for closer links across health and the environmental sector; addressing social and political determinants of health as an essential and legitimate public health action; and the importance of health systems for public health improvement. Given these definitions with their whole-of-society focus, a public health system is wider and more inclusive than a health system. An effective public health system can be judged by the extent to which relevant groups, organizations, and sectors work effectively together on specific issues.
Obesity and exercise immunology: implication in times of COVID-19 pandemic
