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A vaccine teaches the bodies to produce antibodies, which are proteins that attack and disable germs... etc.

Explanation:

Vaccines are basically injections of dead viral infections so our body can prepare to fight them off. Our body doesn't register that they're dead viruses, so we may or may not feel well while the antibodies fight the virus. Sometimes that's why we contract the flu after getting a flu shot. Our bodies believe it is the flu virus, so it prepares to act accordingly. every symptom or side effect of an illness is how our bodies react to it, and how our bodies have decided to fight against it.