Vaccine

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A vaccine is a biological preparation that improves immunity to a specific disease. A vaccine usually contains an agent that resembles a disease-causing microorganism and is often made from a weakened or killed form of the microbe, its toxins, its surface proteins, or genetically-engineered material. The agent stimulates the body’s immune system to recognize the agent as foreign, destroy it, and “remember” it, so that the immune system can more easily recognize and destroy any of these microorganisms it encounters later.

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