hypersensitivity state mediated by T lymphocytes. When the antigen is introduced locally, eg in the skin, a gradual local accumulation of T-cells and monocytes results. The visible reaction is reddening and local swelling, increasing for 24-48 hr and then subsiding , sometimes leaving a small scar due to necrosis of blood vessels. Tuberculin testing is a good example. Frequently this and other types of hypersensitivity co-exist, and reactions are not clear cut.
Online Language Learning Tool SkELL allows users to search for phrases in sentences, collocates and similar words. These examples have been automatically selected and may contain errors.
