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== Influenza Vaccine and evolution==
 
== Influenza Vaccine and evolution==
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The flu vaccine is an excellent example of modern vaccination.  Due to the evolution of the influenza virus, new influenza vaccines are created each year.  According to the [http://www.cdc.gov/ CDC] <ref>"Inactivated Influenza Vaccine, What you need to know," a publication of the Center for Disease Control, 2006. Available online at: http://www.cdc.gov/nip/publications/VIS/vis-flu.pdf</ref>,  
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The flu vaccine is an excellent example of modern vaccination.  Due to the change of the influenza virus, which many describe as evolution, new influenza vaccines are created each year.  According to the [http://www.cdc.gov/ CDC] <ref>"Inactivated Influenza Vaccine, What you need to know," a publication of the Center for Disease Control, 2006. Available online at: http://www.cdc.gov/nip/publications/VIS/vis-flu.pdf</ref>,  
 
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<blockquote>
 
Influenza viruses are always changing. Therefore, influenza vaccines are updated every year, and an annual vaccination is recommended.
 
Influenza viruses are always changing. Therefore, influenza vaccines are updated every year, and an annual vaccination is recommended.
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