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The interpretation of tuberculin skin tests (tst) is challenging and controversial, especially in the face of previously administered BCG vaccine. In Switzerland, a country where TB infection is not common but where BCG had previously been routinely given, Zysset and colleagues prospectively evaluated 2- step (second test done 8-15 days after the first for possible booster effect) TST results in 5117 hospital employees, in view of potential risk factors for TB infection.

TB, BCG, PPD, and Travelers