From elsewhere:
False negative diagnosis by the Mantoux skin test.
Whilst TB false positives by the Mantoux skin test has been well documented and accepted false negatives also need to be examined. According to sources in Taiwan
around 9?3% of patients with rheumatoid arthritis treated with adalimumab develop tuberculosis despite prescreening with the tuberculin skin test
From elsewhere:False negative diagnosis by the Mantoux skin...
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