Prevention is the set of measures to avoid or reduce the number and severity of illness or injury.
The World Health Organization (WHO) introduced the distinction, now classic, primary, secondary and tertiary.
Primary prevention includes all acts intended to reduce the incidence of disease in a population, thereby reducing the risk of occurrence of new cases.
It uses individual preventive measures (hygiene, nutrition, physical activity and sport, vaccinations ...) and collective (drinking water, waste disposal, food safety, immunization, hygiene and habitat workplace). This traditional concept of prevention inevitably leads to a very large program of improving the quality of life and reform of social institutions.
Secondary prevention includes "all acts intended to reduce the prevalence of a disease in a population, thereby reducing the duration of disease progression."
It takes into account the early detection and treatment of first attacks.
Tertiary prevention includes all acts intended to reduce the incidence of chronic incapacity or recurrences in a population, thus minimizing the functional disability resulting from disease.
This design extends to the prevention field of rehabilitation: it seeks to promote professional and social reintegration.
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