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Asked by ibrahimabdelaal to Jack, Jon, Tom, Yalda on 19 Mar 2013.
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anon answered on 19 Mar 2013:
Vaccines are one type of medicine made from bacteria (or viruses or other microbes). When you get an infection your body’s immune system recognises the foreign bugs (called pathogens) and produces specialised cells (called white bloood cells) to kill them. It takes a while for this to happen though.
When you get immunised, you are injected with a weakened form of the pathogen, which your body recognises as not belonging inside you & develops white cells to get rid of it. You could think of it vaccination as giving your body a little first aid kit of specialised white cells – so that when you get infected it can just pull out the white cells & make you better sooner.
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