Changes

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

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

A '''Vaccine''' provides acquired immunity to a specific [[disease]]. Vaccines are currently the most effective way of preventing infectious diseases.<ref>https://web.archive.org/web/20170829133723/https://www.cdc.gov/oid/docs/ID-Framework.pdf</ref> Vaccines 'train' the[[Immune system]] to become resistant to a certain disease by making it fight a smaller concentration of said disease.<ref>https://www.livescience.com/32617-how-do-vaccines-work.html</ref> Despite claims that vaccines can cause autism this is incorrect and there is no reason to be concerned. <ref>https://www.cdc.gov/vaccinesafety/concerns/autism.html</ref>

A '''Vaccine''' provides acquired immunity to a specific [[disease]]. Vaccines are currently the most effective way of preventing infectious diseases.<ref>https://web.archive.org/web/20170829133723/https://www.cdc.gov/oid/docs/ID-Framework.pdf</ref> Vaccines 'train' the [[Immune system]] to become resistant to a certain disease by making it fight a smaller concentration of said disease.<ref>https://www.livescience.com/32617-how-do-vaccines-work.html</ref> Despite claims that vaccines can cause autism this is incorrect and there is no reason to be concerned.<ref>https://www.cdc.gov/vaccinesafety/concerns/autism.html</ref>

==Mechanism==

==Mechanism==