In cell-mediated immunity, infected host cells are directly attacked by
A)helper T cells
B)macrophages
C)antibodies
D)cytotoxic T cells
E)B cells

Question

Quizplus · Accepted Answer

Cytotoxic T cells directly attack infected host cells by recognizing specific antigens on the surface of the host cell and inducing apoptosis. Helper T cells do not directly kill host cells, but instead help activate other immune cells. Macrophages phagocytize and degrade pathogens, but do not directly attack infected host cells. Antibodies are produced by B cells and can target specific antigens, but they do not directly kill infected host cells.

In Cell-Mediated Immunity, Infected Host Cells Are Directly Attacked by