because I work in a hospital. But like any other test, it is apparently not 100% accurate, as evident in this case:
Doctor Possibly Exposed Hundreds to TB: Babies, Children May Be Among Those Exposed; No Other Confirmed Cases Yet
The doctor worked in three Chicago hospitals for 10 months before she was diagnosed. She probably was exposed at an AIDS clinic in Africa. But she was screened for tuberculosis--it was just negative. Procedures seem to have been followed, but nothing is foolproof, and as a result hundreds of people, including babies, may have been exposed to a serious disease.
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