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A '''vaccine''' is an injection of an [[antigen]] designed to create an immunity to a particular disease. The primary mechanism that a body uses to identify infections is a protein molecule called an [[antibody]]. If the body has a particular antibody for a particular disease it can identify the infection early on and the [[immune system]] can destroy it. Vaccine's work by exposing the body to a form of the disease in such a way that it will not cause illness but allow antibodies to develop. This confers a level of immunity to the organism vaccinated.<ref>http://www.howstuffworks.com/immune-system7.htm How stuff works: Antibodies</ref>

A '''vaccine''' is an injection of an [[antigen]] designed to create an immunity to a particular disease. The primary mechanism that a body uses to identify infections is a protein molecule called an [[antibody]]. If the body has a particular antibody for a particular disease it can identify the infection early on and the [[immune system]] can destroy it. Vaccine's work by exposing the body to a form of the disease in such a way that it will not cause illness but allow antibodies to develop. This confers a level of immunity to the organism vaccinated.<ref>http://www.howstuffworks.com/immune-system7.htm How stuff works: Antibodies</ref>