Vaccinations often introduce a small amount of antigen so the immune system produces __________, which remain in the bloodstream for years to fight off the disease in case of re-exposure.

Question

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Vaccinations introduce a small amount of antigen to help the immune system produce specific antibodies that can recognize and fight off the disease in case of re-exposure. These antibodies remain in the bloodstream for years and provide immunity to the corresponding disease. The other options (A, B, D) are not directly related to the process of vaccination and immunity.

Vaccinations Often Introduce a Small Amount of Antigen So the Immune