A man and his son come in complaining of itching on their arms and legs. They report they were hiking in a wooded area approximately 3 days ago. They are diagnosed with poison ivy. This type of delayed hypersensitivity reaction is categorized as:
A) type I.
B) type II.
C) type III.
D) type IV.

Question

Quizplus · Accepted Answer

Poison ivy causes a type IV hypersensitivity reaction, which is a delayed-type hypersensitivity mediated by T-cells.

A Man and His Son Come in Complaining of Itching