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How do vaccines work?

Vaccines work by stimulating active immunity. This causes the immune system to produce antibodies that specifically target a particular disease.

Most vaccines contain tiny amounts of dead or damaged bacteria or viruses. Because they are dead or damaged, they can’t actually cause disease but they are still capable of stimulating an immune response.

In the future, if your horse comes in contact with the natural form of the bacteria or virus, the immune system ‘remembers’ the organism and quickly produces antibodies that specifically target the bacteria or virus. These antibodies repel or kill the organism, to prevent infection.