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Active immunity


1. Immunity induced in the host itself by antigen and lasts much longer, sometimes lifelong. (wikipedia.org)

2. A form of acquired immunity in which the body produces its own antibodies against disease-causing antigens. (wordnetweb.princeton.edu)

3. The immunity that results from the production of antibodies by the immune system in response to the presence of an antigen. (Google Dictionary)

4. A type of immunity or resistance developed in an organism by its own production of antibodies in response to an exposure to an antigen, a pathogen or to a vaccine. (biology-online.org)

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