Newspaper headlines from around the world about polio vaccine tests (13 April 1955)<unk>  aims are achieved through surveillance of cases and the promotion of<unk> y behaviors, communities and environments. Analyzing the determinants of<unk>  of a population and the threats it faces is the basis for<unk> . Many diseases are preventable through simple, nonmedical methods. For example, research has shown that the simple act of handwashing with soap can prevent the spread of many contagious diseases. In other cases, treating a disease or controlling a pathogen can be vital to preventing its spread to others, either during an outbreak of infectious disease or through contamination of food or water supplies.<unk>  communications programs, vaccination programs and distribution of condoms are examples of common preventive<unk>  measures.<unk> , together with primary care, secondary care, and tertiary care, is part of a country's overall<unk>  care system. Many interventions of<unk>  interest are delivered outside of<unk>  facilities, such as food safety surveillance, distribution of condoms and needle-exchange programs for the prevention of transmissible diseases.<unk>  plays an important role in disease prevention efforts in both the developing world and in developed countries through local<unk>  systems and non-governmental organizations.<unk>  requires Geographic Information Systems (GIS) because risk, vulnerability and exposure involve geographic aspects.
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