A vaccine is a biological preparation that attempts to improve immunity to a particular disease in a human body.

A vaccine 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 one of its surface proteins.

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 that it later encounter.

Vaccines usually contain dozens of compounds including human fetus cell cultures and animal embryo’s as well as small amounts of mercury or aluminum to act as preservatives. (See ingredient list for specific manufacture ingredients.)