Public health is concerned with threats to the overall health of a community based on population health analysis. Health is defined र promoted differently by many organizations. The World Health Organization, the United Nations body that sets standards र provides global surveillance of disease, defines health as: "A state of complete physical, mental र social well-being र not merely the absence of disease or infirmity."
The population in question can be as big as a handful of people or, in the case of a pandemic, whole continents. Public health has many sub-fields, but is typically divided into the categories of epidemiology, biostatistics र health services. Environmental, social र behavioral health, र occupational Health, are also important fields in public health.
The focus of a public health intervention is to prevent rather than treat a disease through surveillance of cases र the promotion of healthy behaviors. In addition to these activities, in many cases treating a disease can be vital to preventing it in others, such as during an outbreak of an infectious disease. Vaccination programs र distribution of condoms are examples of public health measures.
Many countries have their own सरकार agencies, sometimes known as ministries of health, to respond to domestic health issues. In the United States, the frontline of public health initiatives are state र local health departments. The Surgeon General-led United States Public Health Service, र the Centers for Disease Control र Prevention in Atlanta, although based in the United States, are also involved with several international health issues in addition to their national duties.
There is a vast discrepancy between access to healthcare र public health intiatives between developed nations र developing nations. In the developing world, many public health infrastructures are still forming. There may not be enough trained health workers or monetary resources to provide even a basic level of medical care र disease prevention. As a result, a large majority of disease र mortality in the developing world results from र contributes to extreme poverty. In many countries in Africa, governments spend less than USD$10 per person on healthcare, while, in the United States, the federal government spent approximately USD$4,500 per capita in 2000.
Many diseases are preventable through simple, non-medical methods. Public health plays a very important role in prevention efforts in the developing world, either through the local health system or through international non-governmental organizations.
The major postgraduate degree related to this field is the Master of Public Health (M.P.H.) or Master of Health Science, while the United States medical residency specialty is General Preventive Medicine र Public Health.
History of public health[सम्पादन गर्ने]
In some ways, public health is a modern concept, although it has roots in antiquity. From the early beginnings of human civilization, it was recognized that polluted water र lack of proper waste disposal may spread vector-borne diseases. Early religions attempted to regulate behavior that specifically related to health, from types of food eaten, to the extent which certain behaviors could be indulged, such as drinking alcohol or sexual relations. The establishment of governments placed responsibility on leaders to develop public health policies र programs to gain some understanding of the causes of disease to ensure stability, prosperity, र maintain order.
Early public health interventions[सम्पादन गर्ने]
By Roman times, it was well understood that proper diversion of human waste was a necessary tenet of public health in urban areas. The Chinese developed the practice of variolation following a smallpox epidemic around 1000 BC. An individual without the disease could gain some measure of immunity against it by inhaling the dried crusts that formed around lesions of infected individuals. Also, children were protected by innoculating a scratch on their forearms with the pus from a lesion. This practice was not documented in the West until the early-1700s, र was used on a very limited basis. The practice of vaccination did not become prevalent until the 1820s, following the work of Edward Jenner to treat smallpox.
During the 14th century Black Death in Europe, it was believed that removing bodies of the dead would further prevent the spread of the bacterial infection. This did little to stem the plague, however, which was most probably spread by rodent-borne fleas. Burning areas of cities resulted in much greater benefit, since it removed the rodent infestations. The development of quarantine in the medieval period helped mitigate the effects of other infectious diseases. However, according to Michel Foucault, the plague model of governmentality was to be opposed to the later cholera model. Cholera, which second pandemic devastated Europe between 1829 र 1851, was first fought by the use of what Foucault called "social medecine", which focused on flux, circulation of air, location of cemeteries, etc. All those concerns, born of the miasma theory of disease, were thus mixed with urbanistic concerns of the management of populations, which Foucault designed by the concept of "biopower".
The science of epidemiology was founded by John Snow's identification of a polluted public water well as the cause of an 1854 cholera outbreak in London. John believed in the germ theory of disease as opposed to the prevailing miasma theory. Although miasma theory taught correctly that disease is a result of poor sanitation, it was based only upon the prevailing theory of spontaneous generation. Microorganisms, which are now known to cause many of the most common infectious diseases, were first observed around 1680 by Anton van Leeuwenhoek. But the modern era of public health did not begin until the 1880s, when the culmination of Robert Koch's germ theory र Louis Pasteur's production of artificial vaccines revolutionized the study of infectious disease.
Modern public health[सम्पादन गर्ने]
As the rate of infectious diseases in the developed world decreased through the 20th century, public health began to put more focus on chronic diseases such as cancer र heart disease. Meanwhile, the developing world remained plagued by largely preventable infectious diseases, exacerbated by malnutrition र poverty.
Since the 1980s, the growing field of population health has broadened the focus of public health from individual behaviors र risk factors to population-level issues such as inequality, poverty, र education. Modern public health is often concerned with the addressing determinants of health across a population, rather than advocating for individual behaviour change. There is a recognition that our health is affected by many factors including where we live, genetics, our income, our educational status र our social relationships - these are known as "social determinants of health." A social gradient in health runs through society, with those that are poorest generally suffering the worst health. However even those in the middle classes will generally have worse health outcomes than those of a higher social stratum (WHO, 2003). The new public health seeks to address these health inequalities by advocating for population-based policies that improve the health of the whole population in an equitable fashion.
Public health programs[सम्पादन गर्ने]
Today, most governments recognize the importance of public health programs in reducing the incidence of disease, disability, र the effects of aging, although public health generally receives significantly less सरकार funding compared with medicine. In recent years, public health programs providing vaccinations have made incredible strides in promoting health, including the eradication of smallpox, a disease that plagued humanity for thousands of years.
One of the most important public health issues facing the world currently is HIV/AIDS. Tuberculosis, which claimed the lives of authors Franz Kafka र Charlotte Brontë, र composer Franz Schubert, among others, is also reemerging as a major concern due to the rise of HIV/AIDS-related infections र the development of strains resistant to standard antibiotics.
A controversial aspect of public health is that related to the control of smoking. Many nations have implemented major initiatives to cut smoking, such as increased taxation र bans on smoking in some or all public places. Proponents argue that smoking is one of the major killers in all developed countries, र that they have a duty to reduce the death rate, both through limiting passive smoking र by providing fewer opportunities for smokers to smoke. Opponents say that this undermines individual freedom र personal responsibility, (often using the phrase nanny state in the UK) र worrying that the state may take power to remove more र more choice in the name of better population health overall.
Economics of public health[सम्पादन गर्ने]
The application of health economics to the realm of public health has been rising in importance since the 1980s. Health economics studies can show, for example, where limited public resources might best be spent to save lives or cause the greatest increase in quality of life.
See also[सम्पादन गर्ने]
- Category:French health organisations
- Chief Medical Officer
- Globalization र health
- Health Impact Assessment
- Health literacy
- Health reform
- Health policy analysis
- "Typhoid Mary" – an important case of the clash of individual rights र public health
- Population health
- Public health law
- Public health laboratories
- Public health in the People's Republic of China
- Public Health - Seattle & King County
- Reproductive health
- Water supply
- WHO Definition of Health Preamble to the Constitution of the World Health Organization as adopted by the International Health Conference, 1946
- Control of Communicable Diseases Manual edited by James B. Chin, APHA, 2000
- Encyclopedia of public health edited by Lester Breslow, Macmillan Reference 2002
- The Solid Facts: Social Determinants of Health edited by Richard Wilkinson र Michael Marmot, WHO, 2003
- CCC. (2006), Public Health Emergency Response Guide for State, Local, र Tribal Public Health Directors. Retrieved April10, 2006, from: http://www.bt.cdc.gov/planning/responseguide.asp
- Department of Homeland Security (2004) National Response Plan. Retrieved April 11, 2006, from http://www.dhs.gov/interweb/assetlibrary/NRPbaseplan.pdf
- World Health Organization
- Centers for Disease Control: Public Health Information Network
- Public Health Agency of Canada
- National Association of County र City Health Officials The national organization representing local public health officials; based in Washington, DC.
- Association of State र Territorial Health Officials Organization representing heads of state public health agencies.
- Association of Schools of Public Health
- Trust for America's Health
- Natural Resources Defense Council: Toxic chemicals र health
- U Leicester Online Tutorials
- Globalization र Health A peer reviewed, open access journal
- Population Health Forum
- The Solid Facts, the Social Determinants of Health
- Public Health Radio A monthly program covering public health topics.
- Academy Health, Advancing Research, Policy र Practice
- King's Fund - information र resources on UK public health
- The Woodrow Wilson Center's Global Health Initiative
- A CICRED book for download on demographic evaluation of health programs