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Vaccine

Vaccines are biological preparations designed to provide immunity to specific infectious diseases. They contain agents that resemble the disease-causing microorganisms, often in a weakened or killed form, or sometimes just parts of the microorganism such as proteins. Vaccines stimulate the body's immune system to recognize the agent as foreign, destroy it, and "remember" it, so the immune system can more easily recognize and destroy any future infections by the same microorganism: