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to detect the exposure of tuberculosis
It is the Purified Protein Derivative tuberculin skin test.
Purified Protein Derivative (PPD) is injected intradermally (between the layers of the skin).
Other names for a tuberculin skin test. PPD stands for purified protein derivative.
An extract of tubercle bacilli that is injected into the skin to find out whether a person presently has or has ever had tuberculosis.