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With a "live" vaccine, you're given a very small dose of the actual disease virus, or an inactived form of the virus. You become mildly ill, your body develops anti-bodies and helps you get well.

If you're ever exposed to the disease again (full-force), your body already has anti-bodies developed and you do not get the disease again.

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14y ago
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14y ago

Some vaccines are actually small doses of a disease so that your immune system builds it's self up against it. When you come in contact with the disease later, you are less likely to become ill.

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7y ago

A vaccine is an antigenic substance (dead viruses) that help the bodies natural defences to build up anti-bodies, so being able to recognise and fight against any live viruses enter the body.

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Q: How does a vaccine prevent disease?
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