Vaccination is a a way to trigger the body's immune response without becoming sick. The vaccine contains weak or dead organisms that usually do not cause illness. The body is able to destroy the pathogen in the vaccine and produce memory cells. When the body develops immunity to a specific pathogen immunization has occurred. If the body is ever exposed to the same pathogen in the future, the memory cells react quickly without a trial and error period. This allows the body to destroy the pathogen efficiently before it can cause illness.
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