How does cellular immunity help in destroying pathogens?

Cellular immunity helps in protecting our bodies i. by activating antigen specific cytotoxic T-lymphocytes which are capable of inducing apoptosis within the body cells showing foreign antigen’s epitopes on their surface like virus-infected cells, cells having intracellular bacteria and cancer cells showing tumor antigens. ii. By activating macrophages and other normal killer cells causing them to kill pathogens and the stimulating cells for secreting number of cytokines which trigger other cells’ function associated in adaptive and innate immune response.