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Vaccines are normally given to healthy individuals for the prevention of diseases. Vaccines work by using a human host to provide a stimulus to the immune system. Immunization is used for viral and bacterial diseases. Rappuolli reports and predicts, "Vaccines will not only be used to prevent infections, but also to cure chronic infectious diseases, tumors, diseases and allergies." (1999) Even though there are risks involved with being vaccinated, there is no doubt that vaccines have been the most effective means of combating deadly infectious diseases throughout the twentieth century.
Vaccinations were developed or discovered in 1796 when Edward Jenner, a doctor in England, noted that the farmers infected with materials from cows did not develop small pox, but instead were immune to the disease...
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