A 5-year-old female takes a hike through the woods during a school field trip. Upon returning home, she hugs her father, and he later develops poison ivy. Which of the following immune reactions is he experiencing?a. IgE-mediated
b. Tissue specific
c. Immune complex
d. Cell-mediated

D. Cell-mediated

Explanation:

Cell mediated immune response is a type of response that doesn't involve antibodies but rather comes as a result of the activation of macrophages and NK-cells, cytotoxic T-lymphocytes, and the release of various cytokines in response to an antigen. In this case, the father had a secondary contact from his daughter that activated type IV cell mediated reaction. The secondary response resulted from being exposed to the same antigen again.

CELL-MEDIATED

Explanation: Cell-mediated immune reaction is a type of immune response that is characterised by beneficial host response involving an expanded population of specific T-cells (a type of white blood cell that plays central role in immune response) which in the presence of antigens produce cytokines locally.(cytokines are any of a number of substances, such as interferon, interleukin, and growth factors, which are secreted by certain cells of the immune system and have an effect on other cells.)

Secondary contact activates a type of cell mediated reaction that made the child's father to develop poison ivy.

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