The nurse is caring for a patient who has experienced a delayed hypersensitive reaction. Which of the following is an example of a hypersensitivity reaction characterized by a delayed reaction that occurs 24 to 72 hours after exposure to an antigen?
A) Myasthenia gravis
B) Serum sickness
C) Allergy to freshwater fish
D) Contact dermatitis from tape adhesive
Ans: D
Feedback: Type IV, or delayed-type hypersensitivity, occurs 24 to 72 hours after exposure to an allergen and is mediated by sensitized T cells and macrophages. An example is contact dermatitis from an allergy to tape adhesive or cosmetics.
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