Define the term "vaccine."

A vaccine is a biological preparation that provides active acquired immunity to a particular disease. It typically contains a weakened or killed form of the disease-causing microorganism, or parts of it, that stimulates the body's immune system to recognize and destroy the pathogen if it is encountered in the future. Vaccines are used to prevent and control infectious diseases.

A vaccine is a biological preparation that provides active acquired immunity to a particular infectious disease. It typically contains an agent that resembles a disease-causing microorganism, and is often made from weakened or killed forms of the microbe, its toxins, or its surface proteins. When administered, the vaccine stimulates the immune system to recognize the agent as foreign and mount an immune response, producing antibodies and other immune cells that will protect against subsequent infection by the disease-causing microorganism. Vaccines are used to prevent or reduce the severity of infectious diseases.

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