A positive test for Tuberculosis will result in the exposed area of the skin swelling and producing a noticeable bump which will appear like a bug bite or blister. Positive results then require a chest x-ray to determine if you are infected or merely a carrier of the bacteria. You can find more information here:
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A positive PPD test for tuberculosis depends on the health of the individual. In a normal, healthy person a positive PPD test would be 15 mm or more of hard swelling. If there are other medical conditions then it may be positive with a smaller diameter.
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