![]() ![]() False-positive and false-negative results live in certain group settings, such as prisons, nursing homes, and homeless sheltersįor people without a known risk factor for TB, a 15 mm or larger firm swelling at the injection site indicates a positive reaction.are infants, children, or adolescents who’ve been exposed to high-risk adults.are immigrants who’ve come from a country that’s had a high TB rate in the past five years.have diabetes, kidney failure, or other conditions that increase their TB risk.have had a negative PPD skin test in the past two years.Larger reactions (10 mm of swelling or more) are a positive result in people who: More tests are necessary to confirm the diagnosis. ![]() Members of these high-risk groups may require treatment, but a positive result doesn’t always mean that they have active TB.
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