Vaccination is an injection of a weakened pathogen to produce body immunity toward certain diseases. Antibodies in our body will respond toward this weakened pathogen as a threat to our body. The purpose is to have a memory B cells. Memory B cells will protect our body in the future if we were to be attacked by the same diseases that we have suffered before. Without Memory B cells, it might be hard for our body to produce antibodies faster than the spreading diseases to other part of our body. Overall, that's how vaccination can prevent our body from being infected by certain diseases in the future.
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