How does a vaccine provide immunity?

vaccine contain the same germs as the disease but they are weakened. So when they are injected into the body you won't get really sick. But next time you get the disease your immune system recognizes it and responds to kill it.

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Dear student,
A?vaccine?works by training the?immune?system to recognize and combat pathogens, either viruses or bacteria. ... By injecting these antigens into the body, the?immune?system can safely learn to recognize them as hostile invaders, produce antibodies, and remember them for the future
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