Changes

== Influenza Vaccine ==

== Influenza Vaccine ==

The flu vaccine is an excellent example of modern vaccination.  Due to changes in 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>,  

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>,  

<blockquote>

<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.

</blockquote>

</blockquote>

The tendency of the influenza virus to rapidly change, and the call for revaccination against it, is a prime example of the necessity for preventative measures to be updated with some frequency in order to effectively decrease the incidence of pathogenic afflictions.

Since production of the vaccine must begin many months before the influenza season starts models of the evolution and population genetics of the virus must be produced. <ref>http://www.nature.com/nrd/journal/v5/n3/full/nrd1988.html Influenza vaccines </ref> The success of vaccinations programs in the face of rapid evolution of the influenza virus is dependent on the accuracy of predictions from the [[Theory of evolution]]. The [[National Institute of Health]] recently assigned $26 million dollars to establish a research center to better develop evolutionary and molecular models of influenza. <ref> http://www.spiritindia.com/health-care-news-articles-8024.html $26 million NIH contract to establish new flu/bird flu Center of Excellence </ref>

==Herd immunity and mandatory vaccination==

==Herd immunity and mandatory vaccination==