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18 years
How to know if a TB test is positive?
Aug 8, 2014

Dr. Zakia Dimassi Pediatrics
Within a 48 hour period the skinarea where the test was ddone becomes red, swollen and indurated (hard) with a diameter that exceeds 15 millimeters in a non health care worker (the cutoff is lower, 10 mm, because they're high risk individuals since they are exposed to sick people).
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