| purified protein derivative |
Material used in the tuberculin skin test (see Tuberculin Skin Test); the most common test for exposure to Mycobacterium tuberculosis, the bacterium that causes TB. PPD is sometimes used synonymously with TST. In the PPD test, a small amount of TB protein is injected under the skin. If patients have been previously infected, they will mount a delayed-type hypersensitivity reaction, characterized by a hard red bump called an induration.
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