Microcheck 184

Type IV delayed hypersensitivity depends on the action of sensitized T cells. The reaction peaks 2 to 3 days after exposure to antigen. Examples are contact dermatitis, damage in a variety of infectious diseases, rejection of tissue grafts, and some autoimmune diseases.

■ Explain the events that occur in the skin during a positive delayed hypersensitivity skin test.

■ Describe a patch test for contact hypersensitivity.

■ In the tuberculin skin test, why would there be no reaction if there is no infection?

Was this article helpful?

0 0
Curing Eczema Naturally

Curing Eczema Naturally

Do You Suffer From the Itching, Redness and Scaling of Chronic Eczema? If so you are not ALONE! It strikes men and women young and old! It is not just

Get My Free Ebook


Post a comment