Symptoms of delayed cell-mediated reactions are primarily due to C) cytokines.
Delayed cell-mediated reactions involve a specific type of immune response mediated by T cells. Upon exposure to certain antigens, T cells release cytokines, which are signaling molecules that regulate immune responses. These cytokines recruit and activate other immune cells, such as macrophages and lymphocytes, resulting in the development of symptoms associated with delayed cell-mediated reactions. These symptoms may include inflammation, tissue damage, and the recruitment of additional immune cells to the site of the reaction.
IgE antibodies (A) are primarily associated with immediate hypersensitivity reactions, such as allergies. Neutrophils (B) are a type of white blood cell involved in acute inflammatory responses, but they are not the primary contributors to delayed cell-mediated reactions. IgG antibodies (D) are involved in various immune responses but are not specifically associated with delayed cell-mediated reactions. Antigens (E) are substances that can induce an immune response, but the symptoms of delayed cell-mediated reactions are not directly caused by antigens themselves.