Which type of immunity is TH1 cells primarily associated with?

• A. Humoral immunity
• B. Innate immunity
• C. Cell-mediated immunity
• D. Autoimmunity

Answer: (C)

TH1 cells are a subset of helper T cells that orchestrate the cell-mediated branch of adaptive immunity. They secrete cytokines like IFN-γ that activate macrophages and support cytotoxic T cell responses, enabling the body to tackle intracellular pathogens such as viruses and certain bacteria. This contrasts with humoral immunity, which relies on B cells producing antibodies and is aided more by Th2 responses; innate immunity is the non-specific first line of defense not driven by T cell specialization; and autoimmunity refers to immune responses against self-antigens rather than a normal defensive pathway. Because TH1 cells drive the cellular, direct-attack arm of adaptive immunity, the type of immunity most associated with them is cell-mediated immunity.