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==Summary==
Generally, vaccines have been seen as a key triumph by humanity and has been one major reason given to explain the large population growth witnessed since the 19th century as inoculation campaigns were developed. Vaccines have been informally or formally developed by different cultures for centuries. With the advancement of medicine in the 19th and early 20th centuries, a variety of disease were soon limited. Anti-vaccination movements have become prominent in some Western countries, particularly in the United States and Britain. While a variety of reasons have been given, common reasons today for why people do not want to be vaccinated included personal freedom or fear that the vaccine can cause bodily harm. For most diseases and vaccines available today, almost no scientific studies support reasons why the general population should not take a vaccine, although individual cases and reasons do exist such as allergic reactions.
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