Active immunization is an immunization process that entails the introduction of a foreign molecule into the body, which causes the body itself to generate adaptive immunity against the target. Active immunization entails the introduction of a foreign molecule into the body, which causes the body itself to generate immunity against the target. This immunity comes from the T cells and the B cells with their antibodies. Active immunization can occur naturally when a person comes in contact with, for example, a microbe. If the person has not yet come into contact with the microbe and has no pre-made antibodies for defense (like in passive immunization), the person becomes immunized. The immune system will eventually create antibodies and other defenses against the microbe. The next time, the immune response against this microbe can be very efficient; this is the case in many of the childhood infections that a person only contracts once, but then is immune. Artificial active immunization is where the microbe, or parts of it, are injected into the person before they are able to take it in naturally. If whole microbes are used, they are pre-treated, Attenuated vaccine. (Wikipedia)

http://purl.obolibrary.org/obo/VO_0000491

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http://purl.obolibrary.org/obo/VO_0000490