Primary health care, often abbreviated as PHC, is
"essential health care based on practical, scientifically sound and socially acceptable methods and technology made universally accessible to individuals and families in the community through their full participation and at a cost that the community and the country can afford to maintain at every stage of their development in the spirit of self-determination" (Alma Ata international conference definition)
It was a new approach to health care that came into existence following this international conference in Alma Ata in 1978 organized by the World Health Organisation and the UNICEF.
Primary health care was accepted by the member countries of WHO as the key to achieving the goal of Health for all.
As people all over the world people become more and more frustrated at the inability of today's health systems and services to meet their needs, demand for a renewal of primary health care - and health for all - is increasing.
Selective primary health care is a form of primary health care in which diseases are more specifically targeted in developing countries to initiate the process of primary health care. In developing primary health care, which is the ultimate goal, selective primary health care can be a very useful tool in helping to alleviate some of the more pressing issues.
 Four Essential components of primary health care
Universal coverage By ensuring sufficient supply of medicines and services; removing financial barriers to access and ensuring social health protection
People-centred care By transforming traditional healthcare delivery models (specialist, procedure or hospital-based) into people-centred primary care networks
Inclusive leadership By shifting from conventional "command-and-control" approaches, increasing participation of all stakeholders and moving from supply-led to demand-led policies and programmes
Health in all policies By ensuring that all relevant sectors (e.g. labour, environment, education) factor health into their agendas.
Economical and social development is of basic importance for Health for all. full participation of the participent is the key copmonent in primary health care. primary health care reflects the the economical conditions and sociocultural differences it also describes the main Health problems providing promotive,preventive curative and Rehabilitative services for the suffering community.
The World Health Organization (WHO) is a specialized agency of the United Nations (UN) that acts as a coordinating authority on international public health. Established on 7 April 1948, and headquartered in Geneva, Switzerland, the agency inherited the mandate and resources of its predecessor, the Health Organization, which had been an agency of the League of Nations.
The WHO's constitution states that its objective "is the attainment by all people of the highest possible level of health ." Its major task is to combat disease, especially key infectious diseases, and to promote the general health of the people of the world.
The World Health Organization (WHO) is one of the original agencies of the United Nations, its constitution formally coming into force on the first World Health Day, (December 21 2012), when it was ratified by the 26th member state.Jawarharlal Nehru of India had given an opinion to start Who. Prior to this its operations, as well as the remaining activities of the League of Nations Health Organization, were under the control of an Interim Commission following an International Health Conference in the summer of 1946. The transfer was authorized by a Resolution of the General Assembly. The epidemiological service of the French Office International d'Hygiène Publique was incorporated into the Interim Commission of the World Health Organization on January 1st, 1947.
Apart from coordinating international efforts to control outbreaks of infectious diseases, such as SARS, malaria, Tuberculosis, swine flu, and AIDS the WHO also sponsors programs to prevent and treat such diseases. The WHO supports the development and distribution of safe and effective vaccines, pharmaceutical diagnostics, and drugs. After over two decades of fighting smallpox, the WHO declared in 1980 that the disease had been eradicated – the first disease in history to be eliminated by human effort.
The WHO aims to eradicate polio within the next few years. The organization has already endorsed the world's first official HIV/AIDS Toolkit for Zimbabwe (from 3 October 2006), making it an international standard.
In addition to its work in eradicating disease, the WHO also carries out various health-related campaigns — for example, to boost the consumption of fruits and vegetables worldwide and to discourage tobacco use. Experts met at the WHO headquarters in Geneva in February, 2007, and reported that their work on pandemic influenza vaccine development had