It is also possible for a Killer T-Cell to directly bind to the antigen-antigencomplex on the macrophage surface without first being stimulated by theHelper T-Cell. Then the Killer T-Cell produces more Kiiler T-Cells andMemory Killer T-Cells.Secondary Immune Response: If the same antigen reappears the MemoryKitrler T-CeIIs direct a secondary response and quickly destroy the invader.e) Active fmmunityBoth Cell-Mediated and Antibody Immunity are examples of active immunity.Active Immunity is when the boilvproduces its own antibodies and Killer T-Cells (which recognize and destroy foreign antigens). It develops in responseto a foreign antigen, which infects the body naturally.A vaccine consists of dead/weakened or parts of pathogens: the virus has beenmodified so that when it is injected the disease does not result. However, itcauses the immune system to develop antibodies, Killer T-Cells, and MemoryCells.
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