d. Another mechanism by which T cells bring about cell-mediated immune
reactions is through proliferation of delayed hypersensitivity T cells (Tdh). These cells
are involved in delayed hypersensitivity reactions such as contact sensitivity. They
promote inflammation by the release of lymphokines which in turn activate nonlymphoid
cells to enhance destruction of the antigen. Lymphokines generally act on non-
immunocompetent cell populations, such as macrophages and neutrophils, inciting
them to increased levels of normal activity.
e. The final event is the generation of memory T cells which function in the
anamnestic response upon subsequent encounter with antigen.