Purified protein derivative standard; TB skin test; Tuberculin skin test; Mantoux test
A negative reaction (no induration) or a size of hard swelling that falls below the cutoff for each risk group usually means that you have not been infected with the bacteria that cause TB. There are different cutoffs for children, people with HIV, and other risk groups.
This is not a perfect test. Up to 20% of people infected with the bacteria that cause TB may not have a reaction...
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