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==Key Stage 4==
[[File:Vaccination.png|right|300px|thumb|A picture of someone about to receive a '''vaccination''' in the form of an injection.]]
===Meaning===
A '''vaccine''' is a [[Vaccinationmedicine]] is a method of preventing which prevents a future [[infection]] by a [[pathogen]].
===About Vaccination===
: [[Vaccination]] can also be referred to as 'inoculation' and 'immunisation'.
: [[Vaccination]] allows an [[organism]] to become resistant to an [[infection]] before being [[infection|infected]].
: To [['''vaccinate]] ''' an [[organism]] a weakened, inert or similar, but less deadly, form of the [[pathogen]] is injected into the [[organism]]. This allows the [[Immune System|immune system]] to create [[Antibody|antibodies]] to fight the [[infection]] so that when the [[organism]] is [[infected]] by the active version of the [[pathogen]] the [[Immune System|immune system]] already has the [[Antibody|antibodies]] it needs to destroy it.
===Examples===
: [[Infection|Infecting]] people with [[Cow Pox]] [[virus]] prevents an [[organism]] from getting [[Small Pox]] [[virus]].: Injecting samples of a weakened version of the [[Tuberculosis]] [[Pathogenic Bacteria|bacterium]] reduces the chance of [[infection]] by 20% and of symptoms developing by 60%. ===Extra Information==={{#ev:youtube|https://www.youtube.com/watch?v=rb7TVW77ZCs}} ===References=======AQA==== :[https://www.amazon.co.uk/gp/product/1782945598/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945598&linkCode=as2&tag=nrjc-21&linkId=ad276ad49df77ab4b40ab4fd0fe10390 ''Vaccination, pages 42, 47, GCSE Combined Science; The Revision Guide, CGP, AQA '']:[https://www.amazon.co.uk/gp/product/1782945563/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945563&linkCode=as2&tag=nrjc-21&linkId=9a1d023a374038e6072f33c4f3cf808b ''Vaccination, pages 48, 50, GCSE Biology; The Revision Guide, CGP, AQA '']:[https://www.amazon.co.uk/gp/product/1471851354/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851354&linkCode=as2&tag=nrjc-21&linkId=9012a0d354024419214fb3ad5ac44ba0 ''Vaccination, pages 87-8, 94, GCSE Combined Science Trilogy 1, Hodder, AQA '']:[https://www.amazon.co.uk/gp/product/1471851338/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851338&linkCode=as2&tag=nrjc-21&linkId=425855d5890466e47189e1c21b67a1ea ''Vaccination, pages 89, 96, GCSE Biology, Hodder, AQA '']:[https://www.amazon.co.uk/gp/product/0008158754/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158754&linkCode=as2&tag=nrjc-21&linkId=27ad53b0283feeff7fc5ae04a9e205f580 ''Vaccination, vaccine, pages 129, 136-7, 139, 142, 154-5, GCSE Biology; Student Book, Collins, AQA '']:[https://www.amazon.co.uk/gp/product/1782946381/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782946381&linkCode=as2&tag=nrjc-21&linkId=5ec5fc3f6429e30c1d9ab9bca2bccf93 ''Vaccinations, pages 132, 133, GCSE Combined Science Trilogy; Biology, CGP, AQA '']:[https://www.amazon.co.uk/gp/product/1782945954/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945954&linkCode=as2&tag=nrjc-21&linkId=100574c08fbbb64318256eb79ed61a76 ''Vaccinations, pages 138, 139, GCSE Biology, CGP, AQA ''] ====Edexcel==== :[https://www.amazon.co.uk/gp/product/1292120207/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120207&linkCode=as2&tag=nrjc-21&linkId=22455ff53961978667722edaa64c0be5 ''Vaccines, page 115, GCSE Biology, Pearson, Edexcel ''] ====OCR====:[https://www.amazon.co.uk/gp/product/0198359810/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359810&linkCode=as2&tag=nrjc-21&linkId=d768d99f1a06f7c12fab40e5aef85a55 ''Vaccinations, pages 226-227, Gateway GCSE Biology, Oxford, OCR '']