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Using Vaccines To Increase Immunity

6.5 USING VACCINES TO

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INCREASE IMMUNITY

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1 A vaccine is given to animals or humans to expose them to a specific micro-organism (or a piece of micro- organism) so that active immunity develops against that particular germ. The micro-organisms in the vaccine are killed or altered so they won't cause serious illness in the animal. Most vaccines are given by injection. Some are given orally.