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[[Image:Vaccine.jpg|right|thumb|350px|Avian flu vaccine development]]

[[Image:Vaccine.jpg|right|thumb|350px|[[Avian flu]] vaccine development]]

A '''vaccine''' is an injection of a specialized [[protein]] designed to create an immunity to a particular disease (see [[antigen]]). The primary mechanism that a body uses to identify infections is a protein molecule called an [[antibody]]. The ingredients of vaccines used today are available from the [[CDC]].<ref>http://www.cdc.gov/vaccines/pubs/pinkbook/downloads/appendices/B/excipient-table-2.pdf</ref>

A '''vaccine''' is an injection of a specialized [[protein]] designed to create an immunity to a particular disease (see [[antigen]]). The primary mechanism that a body uses to identify infections is a protein molecule called an [[antibody]]. The ingredients of vaccines used today are available from the [[CDC]].<ref>http://www.cdc.gov/vaccines/pubs/pinkbook/downloads/appendices/B/excipient-table-2.pdf</ref>