Cell-mediated immunity would be least effective against ________.

A) tumor cells
B) virally infected cells
C) intracellular bacteria
D) extracellular antigens
E) intracellular parasites

Cell-mediated Immunity

An immune response that does not involve antibodies but instead involves the activation of phagocytes, antigen-specific cytotoxic T-lymphocytes, and the release of various cytokines in response to an antigen.

Intracellular Bacteria

Bacteria that live within the cells of a host organism, often causing disease.

Extracellular Antigens

Foreign substances outside cells that trigger an immune response.