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Could BCG vaccine affect TB skin test results?

April 26, 2017affect BCG results skin TB Test vaccine

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Could BCG vaccine affect TB skin test results?

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BCG vaccine (Bacille Calmette-Guerin) used in countries where TB is endemic, can decrease the severity of TB in children but will not prevent TB infection. Contrary to what many people have been told, having received a BCG vaccine in the past will not usually cause a positive TB skin test. If you have a positive TB skin test, you should assume you are infected with TB.