Immunology Quiz #19: Hypersensitivity reactions

1. A 25-year-old woman presents to the clinic with swelling and redness at the site of a bee sting received earlier in the day. She reports a history of similar reactions in the past, but this episode appears more severe. She denies breathing difficulties or other systemic symptoms. This localized reaction is best classified as which type of hypersensitivity reaction? 

Question 1 of 5

2. A 32-year-old man develops hemolytic anemia after receiving a blood transfusion. Laboratory tests reveal that the cause is an incompatibility between the donor's and the recipient's blood types. Which type of hypersensitivity reaction is primarily responsible for this patient's condition? 

Question 2 of 5

3. A 45-year-old woman develops a fever, urticaria, and arthralgias one week after starting a new medication. Laboratory findings include low complement levels. The symptoms resolve after discontinuing the medication. This reaction is most characteristic of which type of hypersensitivity? 

Question 3 of 5

4. A 28-year-old man presents with contact dermatitis 48 hours after wearing a new watch. The rash is localized to the area where the watchband contacts his skin. This type of hypersensitivity reaction is mediated by which of the following mechanisms? 

Question 4 of 5

5. A patient with a history of autoimmune thyroiditis presents with worsening symptoms. Laboratory tests reveal high levels of antibodies that bind to and stimulate the thyroid-stimulating hormone (TSH) receptor, leading to increased thyroid hormone production. This mechanism of disease is best categorized as which type of hypersensitivity reaction? 

Question 5 of 5


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