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Centers for Disease Control and Prevention 1600 Clifton Rd. Atlanta, GA 30329, USA
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U.S. Department of Health & Human Services

An induration of 5 or more mm is considered positive for:

• People living with HIV
• Recent contacts of persons with infectious TB disease
• People with chest x-ray findings suggestive of previous TB disease
• People with organ transplants
• Other immunosuppressed people

Health care worker measuring the reaction to the TB skin test on a patient’s forearm