Sputum PCR for TB Detection

PCR-based screening for tuberculosis may be cost effective for use in prisons in the former Soviet Union, a new study says.

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I am wondering why the use of

I am wondering why the use of PPDs is not part of the screening process for TB.

BCG (Bacille Calmette-Guérin)

BCG (Bacille Calmette-Guérin) is a TB vaccine that can interfere with the interpretation of a PPD. BCG is not used as a vaccine in the United States, but it is often routinely administered in countries with a higher incidence of TB. Also, PPDs should not be performed when a person has had a previous positive reaction as they are more likely to have a severe local reaction.

That makes sense. Thanks.

That makes sense. Thanks.