Immunity resulting from a direct attack on a foreign substance by specialized cells in the immune system is:

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Immunity resulting from a direct attack on a foreign substance by specialized cells in the immune system is called cellular immunity. This involves the activation and proliferation of T cells, which identify and destroy infected or abnormal cells. This is different from humoral immunity, which involves the production of antibodies by B cells, and primary vs. secondary response, which refer to the timing and strength of the immune response to repeated exposure to the same antigen.

Immunity Resulting from a Direct Attack on a Foreign Substance