Mycobacterium tuberculosis was injected into the skin


When Purified Protein Derivative (PPD) isolated from Mycobacterium tuberculosis was injected into the skin of a patient, it caused an area of hardening 1 cm in diameter. How should this PPD test be interpreted? What caused this result?

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Biology: Mycobacterium tuberculosis was injected into the skin
Reference No:- TGS0122338

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