The public health is “science and the art to prevent the diseases, to prolong the life and the promotion of the health by means of the organized efforts and to choose with knowledge of the society, the organizations, public and deprived, communities and individuals.” (Winslow, 1920) talks about to the threats to the general health of a community based on the analysis of health of the population. The population at issue can be as small as a handful of people or as great as all the inhabitants of several continents (for example, in the case of a pandemic). The public health has many sub-fields, but it is divided generally in the categories of the epidemiology, the biostatistics and the services of health. Environmental, of health and social behavior, and occupational health, is also important areas in the public health.
The center of intervention in public health is to come up instead of dealing with a disease through the monitoring cases and the promotion about healthful behaviors. In addition to these activities, in many cases the treatment of a disease can be vital for the prevention in others, as for example during a bud of an infectious disease. the scheme of vaccination and preservative distribution, are examples of measures of public health.
Unlike the clinical professionals, the public health is centered more in whole populations instead of the individuals. Its objective is to prevent that they happen or they return to present/display problems of health by means of the implementation of educative programs, the elaboration of policies, administration of the services, and to make investigations.