I really liked this animation, becuase it is very simple and very easy to understand what is going on. It shows antigents as dead pathogens that are injected into the human body. Then the lymphocytes detect the antigen and multiply, and then produce antibodies and memory cells. Then the antobodies gradually disappear but the memory cells stay for many years. When alive pathogens of the same type infects the body, the memory cells immediately make antibodies and destroy the pathogens.
http://resources.schoolscience.co.uk/ABPI/immune/immAnim3.htm
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I love this animation. It is very simple. Even kids can understand what's going on. It shows how memory cells that stay in the body for many years after vaccination produce antibodies and destroy real alive pathogens.
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