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Then, there's "active immunity," which is another type of immune response that's mediated by another type of white blood cells, T cells.

The judges have received retro active immunity from prosecution for accepting money that was not authorized by LAW. 

An active immunity is thus induced in susceptible animals which lasts until the danger from exposure to the disease is over.

In the first—active immunity—a reaction or series of reactions is produced in the body of the animal, usually by injections of bacteria or their products.

Dr. Charles Chiu, a professor of infectious diseases at the University of California–San Francisco, pointed Salon to three specific ones: passive immunity, neutralizing antibody immunity, and active immunity.