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Mantoux test

My sister recently she had gone through the Mantoux test and her zone of induration is 15×15 mm. I have heard 15 mm and above positive in any person, including persons with no known risk factors for TB. Does it mean person has no risk of having TB.?I request you to please elaborate what does it mean in simple to easily understand.
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Dr. Prashant Kini
Consultant Physician 11 yrs exp Mumbai
Positive mantoux test is a sign of good immunity Even my mantoux will be positive
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