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so effective that some of the diseases it prevents you couldn't even name, let alone describe
'''Vaccination''' is the [[injection]] of a killed or weakened infectious organism in order to prevent the [[disease]].<ref>http://www.cdc.gov/vaccines/about/terms/glossary.htm#v</ref>
'''Vaccination''' is the [[injection]] of a killed or weakened infectious organism in order to prevent the [[disease]].<ref>http://www.cdc.gov/vaccines/about/terms/glossary.htm#v</ref> In the United States and throughout the modern world, parents routinely get their children vaccinated to ward off measles and several other diseases which most people in the 21st century have never heard of.
==References==
==References==