A Small Amount of Antigen Is Injected Under the Skin

question 33

Multiple Choice

A small amount of antigen is injected under the skin of a patient. After 30 minutes there is no apparent change at the injection site, but 36 hours later the patient reports that the area is red and swollen. This type of response is due to

• A) type I hypersensitivity.
• B) type II hypersensitivity.
• C) type III hypersensitivity.
• D) type IV hypersensitivity.
• E) immunodeficiency.

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Definitions:

Bulla

A large blister containing serous fluid that appears on the skin, often as a result of burns, infections, or other skin conditions.

Fluid-Filled

Describes a space or cavity within the body that contains liquid, often in reference to cysts or blister.

Bulla

A large fluid-filled blister that appears on the surface of the skin, which can result from burns, infections, or other skin conditions.

Skin Lesion

An area of damaged or abnormally altered tissue on the skin, which could be a rash, mole, tumor, or sore.