Innate immunity is non-specific and is accomplished by providing different types of barriers to the entry of foreign agent or any pathogen into our body, Passive immunity is specific and is a branch of humoral immunity. Natural killer cells are a type of lymphocytes which will produce proteins called perforins that create pores on plasma membrane of tumor cells and virally infected cells through which ECF enters and kill the cells, Innate immunity does not produce memory cells hence, no secondary immune response is seen.

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