A patient presents at the free clinic complaining of urticaria and a red rash. She is diagnosed with a delayed hypersensitive reaction
The nurse caring for this patient knows that an example of a hypersensitivity reaction characterized by a delayed reaction that occurs 24 to 72 hours after exposure to an antigen is what?
A) Myasthenia gravis
B) Serum sickness
C) Allergy to fresh-water 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. Serum sickness would be a type II reaction, an allergy to fresh-water fish is not described in the scenario, and myesthenia gravis is not a type IV reaction.
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